diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4f3bb83f..d0312000 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,8 +18,8 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v7
         with:
           node-version: 'lts/*'
           check-latest: true
@@ -46,12 +46,12 @@ jobs:
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v7
         with:
           node-version: ${{ matrix.node-version }}
           check-latest: true
-      - uses: dart-lang/setup-dart@v1
+      - uses: dart-lang/setup-dart@v1.8.1
         with: {sdk: stable}
       - run: dart --version
 
@@ -89,10 +89,10 @@ jobs:
             node_version: lts/-2
 
     steps:
-      - uses: actions/checkout@v6
-      - uses: dart-lang/setup-dart@v1
+      - uses: actions/checkout@v7
+      - uses: dart-lang/setup-dart@v1.8.1
         with: {sdk: stable}
-      - uses: actions/setup-node@v6
+      - uses: actions/setup-node@v7
         with: {node-version: "${{ matrix.node_version }}"}
 
       - name: Check out Dart Sass
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e82f96ec..9e664560 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -9,8 +9,8 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v7
         with:
           node-version: 'lts/*'
           check-latest: true
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7cdd7f5c..fa700ccb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,172 @@
+## 1.104.1
+
+* Fix a bug where loud comments before `@use` rules could be emitted multiple
+  times under certain circumstances.
+
+* Fix a bug in which an invalid selector at the end of an indented syntax
+  stylesheet would cause the parser to crash instead of emitting a useful error
+  message.
+
+### Command Line Interface
+
+* Many-to-many compilations no longer compile any files that appear in the
+  output directory if the output directory is also within the source directory.
+  This fixes a bug where `--watch` mode could enter an infinite loop recompiling
+  the same CSS file over and over.
+
+* Sass now sets the modification time of output files to the time compilation
+  *started* rather than the time it *ended*. This ensures that, if a source file
+  is modified during compilation, `--watch` and `--update` mode will recompile
+  the outputs to include the new source file contents.
+
+## 1.104.0
+
+* **Potentially breaking compatibility fix:** Colors now convert the special
+  values NaN and negative zero, as well as infinity and negative infinity for
+  polar-hue channels, to 0 as per the CSS spec.
+
+* The special value negative zero is now serialized as `-0` instead of `0` for
+  greater compatibility when using it in CSS calculations.
+
+## 1.103.1
+
+* No user-visible changes.
+
+## 1.103.0
+
+* **Potentially breaking compatibility fix:** Colors now preserve "analogous
+  sets" of missing channels during conversions, per the CSS spec. For example,
+  `color.to-space(lch(50% none none), lab)` now returns `lab(50% none none)`
+  instead of `lab(50% 0 0)`.
+
+## 1.102.0
+
+* Use the 2.4 gamma transfer function for rec2020, as specified by the latest
+  draft of CSS Color 4.
+
+## 1.101.7
+
+* No user-visible changes.
+
+## 1.101.6
+
+* No user-visible changes.
+
+## 1.101.5
+
+* No user-visible changes.
+
+## 1.101.4
+
+* Avoid emitting `rgb()` or `rgba()` functions with non-percent decimal
+  channels. Older browsers only support integer values or (potentially decimal)
+  percentages for these functions, so in order to preserve
+  backwards-compatibility while retaining full precision for modern browsers,
+  legacy colors that contain at least one non-integer channel will now use
+  percentages for their channels (for example, `rgb(0%, 100%, 50%)` rather than
+  `rgb(0, 255, 127.5)`).
+
+* Fix a bug where the values of plain-CSS `if()` expressions were emitted using
+  their `meta.inspect()` format rather than their CSS serialization format.
+
+## 1.101.3
+
+* No user-visible changes.
+
+## 1.101.2
+
+* Fix a bug where the deprecation warning for vendor-prefixed `expression()`
+  functions would incorrectly indicate whether or not the function would be
+  invalid Sass in Dart Sass 2.0.0.
+
+## 1.101.1
+
+* Sass stack trace entries are now always either absolute URLs, absolute paths,
+  or paths relative to the current working directory. Previously, if a
+  stylesheet was loaded using a relative URL (as from a load path), that
+  relative URL was listed even if it couldn't be resolved relative to the
+  current working directory. However, this created potential ambiguities, so
+  this behavior has been removed.
+
+### Command Line Interface
+
+* `--watch` mode now handles atomically-written files more gracefully.
+
+## 1.101.0
+
+* **Potentially breaking bug fix:** The Node package importer now properly
+  supports resolving import-only variants of Sass files declared in the
+  `exports`, `sass`, and `style` fields of `package.json`. Previously, these
+  files were ignored even when loaded via `@import`, so any code relying on
+  loading module-system-only files this way may break.
+
+## 1.100.0
+
+* Writing two compound selectors adjacent to one another without any whitespace
+  between them, such as `[class]a`, is now deprecated. This was always an error
+  in CSS and Sass only supported it by mistake.
+
+  See [the Sass website](https://sass-lang.com/d/adjacent-compounds) for
+  details.
+
+## 1.99.0
+
+* Add support for parent selectors (`&`) at the root of the document. These are
+  emitted as-is in the CSS output, where they're interpreted as [the scoping
+  root].
+
+  [the scoping root]: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/Nesting_selector#using_outside_nested_rule
+
+* User-defined functions named `calc` or `clamp` are no longer forbidden. If
+  such a function exists without a namespace in the current module, it will be
+  used instead of the built-in `calc()` or `clamp()` function.
+
+* User-defined functions whose names begin with `-` and end with `-expression`,
+  `-url`, `-and`, `-or`, or `-not` are no longer forbidden. These were
+  originally intended to match vendor prefixes, but in practice no vendor
+  prefixes for these functions ever existed in real browsers.
+
+* User-defined functions named `EXPRESSION`, `URL`, and `ELEMENT`, those that
+  begin with `-` and end with `-ELEMENT`, as well as the same names with some
+  lowercase letters are now deprecated, These are names conflict with plain CSS
+  functions that have special syntax.
+
+  See [the Sass website](https://sass-lang.com/d/function-name) for details.
+
+* In a future release, calls to functions whose names begin with `-` and end
+  with `-expression` and `-url` will no longer have special parsing. For now,
+  these calls are deprecated if their behavior will change in the future.
+
+  See [the Sass website](https://sass-lang.com/d/function-name) for details.
+
+* Calls to functions whose names begin with `-` and end with `-progid:...` are
+  deprecated.
+
+  See [the Sass website](https://sass-lang.com/d/function-name) for details.
+
+## 1.98.0
+
+### Command-Line Interface
+
+* Gracefully handle dependency loops in `--watch` mode.
+
+### Dart API
+
+* Add a `const Logger.defaultLogger` field. This provides a logger that emits to
+  standard error or the browser console, but automatically chooses whether to
+  use terminal colors.
+
+### JavaScript API
+
+* Fix a crash when manually constructing a `SassCalculation` for `'calc'` with
+  an argument that can't be simplified.
+
+* Properly emit deprecation warnings as text rather than `StringBuffer` objects
+  when running in a browser.
+
+* Emit colored warnings and other messages on the console when running in a
+  browser.
+
 ## 1.97.3
 
 * Fix a bug where nesting an at-rule within multiple style rules in plain CSS
diff --git a/lib/src/compiler/async.ts b/lib/src/compiler/async.ts
index 3fcd9025..09f99287 100644
--- a/lib/src/compiler/async.ts
+++ b/lib/src/compiler/async.ts
@@ -96,7 +96,7 @@ export class AsyncCompiler {
   /** Guards against using a disposed compiler. */
   private throwIfDisposed(): void {
     if (this.disposed) {
-      throw utils.compilerError('Async compiler has already been disposed.');
+      throw utils.compilerError('Async compiler has already been disposed');
     }
   }
 
@@ -161,7 +161,7 @@ export class AsyncCompiler {
     if (flag !== initFlag) {
       throw utils.compilerError(
         'AsyncCompiler can not be directly constructed. ' +
-          'Please use `sass.initAsyncCompiler()` instead.',
+          'Please use `sass.initAsyncCompiler()` instead',
       );
     }
     this.stderr$.subscribe(data => process.stderr.write(data));
diff --git a/lib/src/compiler/sync.ts b/lib/src/compiler/sync.ts
index 66fdaf8e..652b96a1 100644
--- a/lib/src/compiler/sync.ts
+++ b/lib/src/compiler/sync.ts
@@ -153,7 +153,7 @@ export class Compiler {
 
       for (;;) {
         if (!this.yield()) {
-          throw utils.compilerError('Embedded compiler exited unexpectedly.');
+          throw utils.compilerError('Embedded compiler exited unexpectedly');
         }
 
         if (error) throw error;
@@ -167,7 +167,7 @@ export class Compiler {
   /** Guards against using a disposed compiler. */
   private throwIfDisposed(): void {
     if (this.disposed) {
-      throw utils.compilerError('Sync compiler has already been disposed.');
+      throw utils.compilerError('Sync compiler has already been disposed');
     }
   }
 
@@ -176,7 +176,7 @@ export class Compiler {
     if (flag !== initFlag) {
       throw utils.compilerError(
         'Compiler can not be directly constructed. ' +
-          'Please use `sass.initAsyncCompiler()` instead.',
+          'Please use `sass.initCompiler()` instead',
       );
     }
     this.stderr$.subscribe(data => process.stderr.write(data));
diff --git a/lib/src/compiler/utils.ts b/lib/src/compiler/utils.ts
index 272aa0c4..288538b5 100644
--- a/lib/src/compiler/utils.ts
+++ b/lib/src/compiler/utils.ts
@@ -183,7 +183,7 @@ export function handleCompileResponse(
   } else if (response.result.case === 'failure') {
     throw new Exception(response.result.value);
   } else {
-    throw utils.compilerError('Compiler sent empty CompileResponse.');
+    throw utils.compilerError('Compiler sent empty CompileResponse');
   }
 }
 
diff --git a/lib/src/deprotofy-span.ts b/lib/src/deprotofy-span.ts
index bd32762f..8e2b8867 100644
--- a/lib/src/deprotofy-span.ts
+++ b/lib/src/deprotofy-span.ts
@@ -14,20 +14,20 @@ export function deprotofySourceSpan(buffer: proto.SourceSpan): SourceSpan {
   const text = buffer.text;
 
   if (buffer.start === undefined) {
-    throw compilerError('Expected SourceSpan to have start.');
+    throw compilerError('Expected SourceSpan to have start');
   }
 
   let end;
   if (buffer.end === undefined) {
     if (text !== '') {
-      throw compilerError('Expected SourceSpan text to be empty.');
+      throw compilerError('Expected SourceSpan text to be empty');
     } else {
       end = buffer.start;
     }
   } else {
     end = buffer.end;
     if (end.offset < buffer.start.offset) {
-      throw compilerError('Expected SourceSpan end to be after start.');
+      throw compilerError('Expected SourceSpan end to be after start');
     }
   }
 
diff --git a/lib/src/protofier.ts b/lib/src/protofier.ts
index c06dfdd6..f772901f 100644
--- a/lib/src/protofier.ts
+++ b/lib/src/protofier.ts
@@ -324,7 +324,7 @@ export class Protofier {
             });
 
           default:
-            throw utils.compilerError(`Unknown color space "${color.space}".`);
+            throw utils.compilerError(`Unknown color space "${color.space}"`);
         }
       }
 
@@ -394,7 +394,7 @@ export class Protofier {
 
       case 'hostFunction':
         throw utils.compilerError(
-          'The compiler may not send Value.host_function.',
+          'The compiler may not send Value.host_function',
         );
 
       case 'compilerMixin':
@@ -454,7 +454,7 @@ export class Protofier {
       case 'calc':
         if (calculation.arguments.length !== 1) {
           throw utils.compilerError(
-            'Value.Calculation.arguments must have exactly one argument for calc().',
+            'Value.Calculation.arguments must have exactly one argument for calc()',
           );
         }
         return SassCalculation.calc(
@@ -466,7 +466,7 @@ export class Protofier {
           calculation.arguments.length > 3
         ) {
           throw utils.compilerError(
-            'Value.Calculation.arguments must have 1 to 3 arguments for clamp().',
+            'Value.Calculation.arguments must have 1 to 3 arguments for clamp()',
           );
         }
         return SassCalculation.clamp(
@@ -481,7 +481,7 @@ export class Protofier {
       case 'min':
         if (calculation.arguments.length === 0) {
           throw utils.compilerError(
-            'Value.Calculation.arguments must have at least 1 argument for min().',
+            'Value.Calculation.arguments must have at least 1 argument for min()',
           );
         }
         return SassCalculation.min(
@@ -490,7 +490,7 @@ export class Protofier {
       case 'max':
         if (calculation.arguments.length === 0) {
           throw utils.compilerError(
-            'Value.Calculation.arguments must have at least 1 argument for max().',
+            'Value.Calculation.arguments must have at least 1 argument for max()',
           );
         }
         return SassCalculation.max(
@@ -498,7 +498,7 @@ export class Protofier {
         );
       default:
         throw utils.compilerError(
-          `Value.Calculation.name "${calculation.name}" is not a recognized calculation type.`,
+          `Value.Calculation.name "${calculation.name}" is not a recognized calculation type`,
         );
     }
   }
diff --git a/lib/src/utils.ts b/lib/src/utils.ts
index 1dbbd75c..308f56a8 100644
--- a/lib/src/utils.ts
+++ b/lib/src/utils.ts
@@ -73,7 +73,7 @@ export function compilerError(message: string): Error {
  * been included but was not.
  */
 export function mandatoryError(field: string): Error {
-  return compilerError(`Missing mandatory field ${field}`);
+  return compilerError(`Missing mandatory field ${field}.`);
 }
 
 /** Constructs a host-caused Error. */
diff --git a/lib/src/value/color.ts b/lib/src/value/color.ts
index 5018c220..bc020b26 100644
--- a/lib/src/value/color.ts
+++ b/lib/src/value/color.ts
@@ -86,10 +86,7 @@ type PolarColorSpace = ColorSpaceHsl | ColorSpaceHwb | ColorSpaceLch;
  * colors.
  */
 type HueInterpolationMethod =
-  | 'decreasing'
-  | 'increasing'
-  | 'longer'
-  | 'shorter';
+  'decreasing' | 'increasing' | 'longer' | 'shorter';
 
 /**
  * Methods by which colors in bounded spaces can be mapped to within their
@@ -116,30 +113,19 @@ function getColorSpace(options: ChannelOptions): KnownColorSpace {
   throw valueError('No color space found');
 }
 
-/**
- * Convert from the ColorJS representation of a missing component (`NaN`) to
- * `null`.
- */
-function NaNtoNull(val: number): number | null {
-  return Number.isNaN(val) ? null : val;
-}
-
-/**
- * Convert from the ColorJS representation of a missing component (`NaN`) to
- * `0`.
- */
-function NaNtoZero(val: number): number {
-  return Number.isNaN(val) ? 0 : val;
+/** Convert from sRGB (0-1) to RGB (0-255) units. */
+function coordToRgb(val: number | null): number | null {
+  return val === null ? val : val * 255;
 }
 
-/** Convert from sRGB (0-1) to RGB (0-255) units. */
-function coordToRgb(val: number): number {
-  return val * 255;
+/** Convert from RGB (0-255) to sRGB (0-1) units. */
+function rgbToCoord(val: number | null): number | null {
+  return val === null ? val : val / 255;
 }
 
 /** Normalize `hue` values to be within the range `[0, 360)`. */
-function normalizeHue(val: number): number {
-  return positiveMod(val, 360);
+function normalizeHue(val: number | null): number | null {
+  return val === null ? val : positiveMod(val, 360);
 }
 
 /**
@@ -248,7 +234,7 @@ function validateChannelInSpace(
   }
   if (!valid) {
     throw valueError(
-      `Unknown channel name "${channel}" for color space "${space}".`,
+      `Unknown channel name "${channel}" for color space "${space}"`,
     );
   }
 }
@@ -267,24 +253,24 @@ function isPolarColorSpace(space: KnownColorSpace): space is PolarColorSpace {
 }
 
 /**
- * Convert from ColorJS coordinates (which use `NaN` for missing components, and
- * a range of `0-1` for `rgb` channel values) to Sass Color coordinates (which
- * use `null` for missing components, and a range of `0-255` for `rgb` channel
- * values).
+ * Convert from ColorJS coordinates (which use a range of `0-1` for `rgb`
+ * channel values) to Sass Color coordinates (which use a range of `0-255` for
+ * `rgb` channel values).
  */
 function decodeCoordsFromColorJs(
-  coords: [number, number, number], // ColorJS coordinates
+  coords: [number | null, number | null, number | null], // ColorJS coordinates
   isRgb = false, // Whether this color is in the `rgb` color space
 ): [number | null, number | null, number | null] {
   let newCoords = coords;
   // If this color is in the `rgb` space, convert channel values to `0-255`
-  if (isRgb) newCoords = newCoords.map(coordToRgb) as [number, number, number];
-  // Convert `NaN` values to `null`
-  return newCoords.map(NaNtoNull) as [
-    number | null,
-    number | null,
-    number | null,
-  ];
+  if (isRgb) {
+    newCoords = newCoords.map(coordToRgb) as [
+      number | null,
+      number | null,
+      number | null,
+    ];
+  }
+  return newCoords;
 }
 
 /** Returns `true` if `val` is a `number` or `null`. */
@@ -393,9 +379,9 @@ export class SassColor extends Value {
     const space = options.space ?? getColorSpace(options);
     this.setChannelIds(space);
     if (space === 'rgb') this.isRgb = true;
-    let alpha: number;
+    let alpha: number | null;
     if (options.alpha === null) {
-      alpha = NaN;
+      alpha = null;
     } else if (options.alpha === undefined) {
       alpha = 1;
     } else {
@@ -405,14 +391,18 @@ export class SassColor extends Value {
     switch (space) {
       case 'rgb':
       case 'srgb': {
-        const red = options.red ?? NaN;
-        const green = options.green ?? NaN;
-        const blue = options.blue ?? NaN;
+        const red = options.red ?? null;
+        const green = options.green ?? null;
+        const blue = options.blue ?? null;
         if (this.isRgb) {
           this.color = new Color({
             spaceId: encodeSpaceForColorJs(space),
             // convert from 0-255 to 0-1
-            coords: [red / 255, green / 255, blue / 255],
+            coords: [red, green, blue].map(rgbToCoord) as [
+              number | null,
+              number | null,
+              number | null,
+            ],
             alpha,
           });
         } else {
@@ -434,21 +424,23 @@ export class SassColor extends Value {
         this.color = new Color({
           spaceId: encodeSpaceForColorJs(space),
           coords: [
-            options.red ?? NaN,
-            options.green ?? NaN,
-            options.blue ?? NaN,
+            options.red ?? null,
+            options.green ?? null,
+            options.blue ?? null,
           ],
           alpha,
         });
         break;
 
       case 'hsl': {
-        let hue = normalizeHue(options.hue ?? NaN);
-        let saturation = options.saturation ?? NaN;
-        const lightness = options.lightness ?? NaN;
-        if (!Number.isNaN(saturation) && fuzzyLessThan(saturation, 0)) {
+        let hue = normalizeHue(options.hue ?? null);
+        let saturation = options.saturation ?? null;
+        const lightness = options.lightness ?? null;
+        if (saturation !== null && fuzzyLessThan(saturation, 0)) {
           saturation = Math.abs(saturation);
-          hue = (hue + 180) % 360;
+          if (hue !== null) {
+            hue = (hue + 180) % 360;
+          }
         }
 
         this.color = new Color({
@@ -460,9 +452,9 @@ export class SassColor extends Value {
       }
 
       case 'hwb': {
-        const hue = normalizeHue(options.hue ?? NaN);
-        const whiteness = options.whiteness ?? NaN;
-        const blackness = options.blackness ?? NaN;
+        const hue = normalizeHue(options.hue ?? null);
+        const whiteness = options.whiteness ?? null;
+        const blackness = options.blackness ?? null;
         this.color = new Color({
           spaceId: encodeSpaceForColorJs(space),
           coords: [hue, whiteness, blackness],
@@ -473,9 +465,9 @@ export class SassColor extends Value {
 
       case 'lab':
       case 'oklab': {
-        const lightness = options.lightness ?? NaN;
-        const a = options.a ?? NaN;
-        const b = options.b ?? NaN;
+        const lightness = options.lightness ?? null;
+        const a = options.a ?? null;
+        const b = options.b ?? null;
         this.color = new Color({
           spaceId: encodeSpaceForColorJs(space),
           coords: [lightness, a, b],
@@ -486,12 +478,14 @@ export class SassColor extends Value {
 
       case 'lch':
       case 'oklch': {
-        const lightness = options.lightness ?? NaN;
-        let chroma = options.chroma ?? NaN;
-        let hue = normalizeHue(options.hue ?? NaN);
-        if (!Number.isNaN(chroma) && fuzzyLessThan(chroma, 0)) {
+        const lightness = options.lightness ?? null;
+        let chroma = options.chroma ?? null;
+        let hue = normalizeHue(options.hue ?? null);
+        if (chroma !== null && fuzzyLessThan(chroma, 0)) {
           chroma = Math.abs(chroma);
-          hue = (hue + 180) % 360;
+          if (hue !== null) {
+            hue = (hue + 180) % 360;
+          }
         }
 
         this.color = new Color({
@@ -507,23 +501,16 @@ export class SassColor extends Value {
       case 'xyz-d50':
         this.color = new Color({
           spaceId: encodeSpaceForColorJs(space),
-          coords: [options.x ?? NaN, options.y ?? NaN, options.z ?? NaN],
+          coords: [options.x ?? null, options.y ?? null, options.z ?? null],
           alpha,
         });
         break;
     }
-
-    // @TODO Waiting on new release of ColorJS that includes allowing `alpha`
-    // to be `NaN` on initial construction.
-    // Fixed in: https://github.com/LeaVerou/color.js/commit/08b39c180565ae61408ad737d91bd71a1f79d3df
-    if (Number.isNaN(alpha)) {
-      this.color.alpha = NaN;
-    }
   }
 
   /** This color's alpha channel, between `0` and `1`. */
   get alpha(): number {
-    return NaNtoZero(this.color.alpha);
+    return this.color.alpha ?? 0;
   }
 
   /** The name of this color's color space. */
@@ -548,9 +535,13 @@ export class SassColor extends Value {
   get channelsOrNull(): List<number | null> {
     let coords = this.color.coords;
     if (this.space === 'rgb') {
-      coords = coords.map(coordToRgb) as [number, number, number];
+      coords = coords.map(coordToRgb) as [
+        number | null,
+        number | null,
+        number | null,
+      ];
     }
-    return List(coords.map(NaNtoNull));
+    return List(coords);
   }
 
   /**
@@ -562,9 +553,13 @@ export class SassColor extends Value {
   get channels(): List<number> {
     let coords = this.color.coords;
     if (this.space === 'rgb') {
-      coords = coords.map(coordToRgb) as [number, number, number];
+      coords = coords.map(coordToRgb) as [
+        number | null,
+        number | null,
+        number | null,
+      ];
     }
-    return List(coords.map(NaNtoZero));
+    return List(coords.map(val => val ?? 0));
   }
 
   assertColor(): SassColor {
@@ -626,7 +621,7 @@ export class SassColor extends Value {
   channel(channel: ChannelNameXyz, options: {space: ColorSpaceXyz}): number;
   channel(channel: ChannelName, options?: {space: KnownColorSpace}): number {
     if (channel === 'alpha') return this.alpha;
-    let val: number;
+    let val: number | null;
     const space = options?.space ?? this.space;
     validateChannelInSpace(channel, space);
     if (options?.space) {
@@ -641,7 +636,7 @@ export class SassColor extends Value {
       });
     }
     if (space === 'rgb') val = coordToRgb(val);
-    return NaNtoZero(val);
+    return val ?? 0;
   }
 
   /**
@@ -651,13 +646,13 @@ export class SassColor extends Value {
    * [missing channel]: https://developer.mozilla.org/en-US/docs/Web/CSS/color_value#missing_color_components
    */
   isChannelMissing(channel: ChannelName): boolean {
-    if (channel === 'alpha') return Number.isNaN(this.color.alpha);
+    if (channel === 'alpha') return this.color.alpha === null;
     validateChannelInSpace(channel, this.space);
-    return Number.isNaN(
+    return (
       this.color.get({
         space: this.color.spaceId,
         coordId: encodeChannelForColorJs(channel),
-      }),
+      }) === null
     );
   }
 
@@ -748,7 +743,7 @@ export class SassColor extends Value {
 
     if (weight < 0 || weight > 1) {
       throw valueError(
-        `Expected \`weight\` between \`0\` and \`1\`, received \`${weight}\`.`,
+        `Expected \`weight\` between \`0\` and \`1\`, received \`${weight}\``,
       );
     }
 
@@ -764,7 +759,7 @@ export class SassColor extends Value {
       [this.channel0Id]: coords[0],
       [this.channel1Id]: coords[1],
       [this.channel2Id]: coords[2],
-      alpha: NaNtoNull(this.color.alpha),
+      alpha: this.color.alpha,
     });
   }
 
@@ -932,11 +927,11 @@ export class SassColor extends Value {
         coords = this.color
           .to('srgb')
           .coords.map(coordToRgb)
-          .map(fuzzyRound) as [number, number, number];
+          .map(fuzzyRound) as [number | null, number | null, number | null];
         otherCoords = other.color
           .to('srgb')
           .coords.map(coordToRgb)
-          .map(fuzzyRound) as [number, number, number];
+          .map(fuzzyRound) as [number | null, number | null, number | null];
       }
       return (
         fuzzyEquals(coords[0], otherCoords[0]) &&
diff --git a/lib/src/value/index.ts b/lib/src/value/index.ts
index b77c3395..793d04db 100644
--- a/lib/src/value/index.ts
+++ b/lib/src/value/index.ts
@@ -86,7 +86,7 @@ export abstract class Value implements ValueObject {
     }
     if (Math.abs(index) > this.lengthAsList) {
       throw valueError(
-        `Invalid index ${sassIndex} for a list with ${this.lengthAsList} elements.`,
+        `Invalid index ${sassIndex} for a list with ${this.lengthAsList} elements`,
         name,
       );
     }
diff --git a/lib/src/value/number.ts b/lib/src/value/number.ts
index 52397e57..298c99ac 100644
--- a/lib/src/value/number.ts
+++ b/lib/src/value/number.ts
@@ -596,7 +596,7 @@ export class SassNumber extends Value {
       }
 
       if (!otherHasUnits) {
-        return valueError(`Expected ${this} to have no units.`, params.name);
+        return valueError(`Expected ${this} to have no units`, params.name);
       }
 
       // For single numerators, throw a detailed error with info about which unit
@@ -607,7 +607,7 @@ export class SassNumber extends Value {
           return valueError(
             `Expected ${this} to have a single ${type} unit (${unitsByType[
               type
-            ].join(', ')}).`,
+            ].join(', ')})`,
             params.name,
           );
         }
@@ -622,7 +622,7 @@ export class SassNumber extends Value {
                 newNumerators,
                 newDenominators,
               )}`
-        }.`,
+        }`,
         params.name,
       );
     };
diff --git a/lib/src/value/utils.ts b/lib/src/value/utils.ts
index 7844c810..8f054675 100644
--- a/lib/src/value/utils.ts
+++ b/lib/src/value/utils.ts
@@ -16,7 +16,10 @@ export const precision = 10;
 const epsilon = 10 ** (-precision - 1);
 
 /** Whether `num1` and `num2` are equal within `epsilon`. */
-export function fuzzyEquals(num1: number, num2: number): boolean {
+export function fuzzyEquals(num1: number | null, num2: number | null): boolean {
+  if (num1 === null || num2 === null) {
+    return false;
+  }
   return Math.abs(num1 - num2) < epsilon;
 }
 
@@ -25,10 +28,8 @@ export function fuzzyEquals(num1: number, num2: number): boolean {
  *
  * Two numbers that `fuzzyEquals` each other must have the same hash code.
  */
-export function fuzzyHashCode(num: number): number {
-  return !isFinite(num) || isNaN(num)
-    ? hash(num)
-    : hash(Math.round(num / epsilon));
+export function fuzzyHashCode(num: number | null): number {
+  return num === null ? hash(num) : hash(Math.round(num / epsilon));
 }
 
 /** Whether `num1` < `num2`, within `epsilon`. */
@@ -72,7 +73,10 @@ export function fuzzyAsInt(num: number): number | null {
  *
  * If `num` `fuzzyEquals` `x.5`, rounds away from zero.
  */
-export function fuzzyRound(num: number): number {
+export function fuzzyRound(num: number | null): number | null {
+  if (num === null) {
+    return num;
+  }
   if (num > 0) {
     return fuzzyLessThan(num % 1, 0.5) ? Math.floor(num) : Math.ceil(num);
   } else {
diff --git a/npm/all-unknown/package.json b/npm/all-unknown/package.json
index eeb50dd4..c7535f96 100644
--- a/npm/all-unknown/package.json
+++ b/npm/all-unknown/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-all-unknown",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The pure js optional dependency for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
@@ -12,6 +12,6 @@
     "!x64"
   ],
   "dependencies": {
-    "sass": "1.97.3"
+    "sass": "1.104.1"
   }
 }
diff --git a/npm/android-arm/package.json b/npm/android-arm/package.json
index 887f7101..6b68cdcc 100644
--- a/npm/android-arm/package.json
+++ b/npm/android-arm/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-android-arm",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The android-arm binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/android-arm64/package.json b/npm/android-arm64/package.json
index ce0c813f..e0563a9f 100644
--- a/npm/android-arm64/package.json
+++ b/npm/android-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-android-arm64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The android-arm64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/android-riscv64/package.json b/npm/android-riscv64/package.json
index 21a36537..df860337 100644
--- a/npm/android-riscv64/package.json
+++ b/npm/android-riscv64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-android-riscv64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The android-riscv64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/android-x64/package.json b/npm/android-x64/package.json
index 8a27cb6f..9d89dff6 100644
--- a/npm/android-x64/package.json
+++ b/npm/android-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-android-x64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The android-x64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/darwin-arm64/package.json b/npm/darwin-arm64/package.json
index 819cabb8..1164a521 100644
--- a/npm/darwin-arm64/package.json
+++ b/npm/darwin-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-darwin-arm64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The darwin-arm64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/darwin-x64/package.json b/npm/darwin-x64/package.json
index eb4eda66..d123e1e8 100644
--- a/npm/darwin-x64/package.json
+++ b/npm/darwin-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-darwin-x64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The darwin-x64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/linux-arm/package.json b/npm/linux-arm/package.json
index 7bf32cdb..467d3182 100644
--- a/npm/linux-arm/package.json
+++ b/npm/linux-arm/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-linux-arm",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The linux-arm binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/linux-arm64/package.json b/npm/linux-arm64/package.json
index f6255195..7ab022a1 100644
--- a/npm/linux-arm64/package.json
+++ b/npm/linux-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-linux-arm64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The linux-arm64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/linux-musl-arm/package.json b/npm/linux-musl-arm/package.json
index 9d7ca4c5..6e4acb62 100644
--- a/npm/linux-musl-arm/package.json
+++ b/npm/linux-musl-arm/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-linux-musl-arm",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The linux-musl-arm binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/linux-musl-arm64/package.json b/npm/linux-musl-arm64/package.json
index c64412da..170dc11d 100644
--- a/npm/linux-musl-arm64/package.json
+++ b/npm/linux-musl-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-linux-musl-arm64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The linux-musl-arm64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/linux-musl-riscv64/package.json b/npm/linux-musl-riscv64/package.json
index 23077b92..3835436e 100644
--- a/npm/linux-musl-riscv64/package.json
+++ b/npm/linux-musl-riscv64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-linux-musl-riscv64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The linux-musl-riscv64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/linux-musl-x64/package.json b/npm/linux-musl-x64/package.json
index 86e9e070..396b113d 100644
--- a/npm/linux-musl-x64/package.json
+++ b/npm/linux-musl-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-linux-musl-x64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The linux-musl-x64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/linux-riscv64/package.json b/npm/linux-riscv64/package.json
index 8cac976c..5fad3080 100644
--- a/npm/linux-riscv64/package.json
+++ b/npm/linux-riscv64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-linux-riscv64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The linux-riscv64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/linux-x64/package.json b/npm/linux-x64/package.json
index 62f36448..e66d4d2a 100644
--- a/npm/linux-x64/package.json
+++ b/npm/linux-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-linux-x64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The linux-x64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/unknown-all/package.json b/npm/unknown-all/package.json
index 937e94b3..fc294769 100644
--- a/npm/unknown-all/package.json
+++ b/npm/unknown-all/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-unknown-all",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The pure js optional dependency for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
@@ -12,6 +12,6 @@
     "!win32"
   ],
   "dependencies": {
-    "sass": "1.97.3"
+    "sass": "1.104.1"
   }
 }
diff --git a/npm/win32-arm64/package.json b/npm/win32-arm64/package.json
index ac712711..ed480467 100644
--- a/npm/win32-arm64/package.json
+++ b/npm/win32-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-win32-arm64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The win32-arm64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/npm/win32-x64/package.json b/npm/win32-x64/package.json
index 03509fb7..132114a2 100644
--- a/npm/win32-x64/package.json
+++ b/npm/win32-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sass-embedded-win32-x64",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "description": "The win32-x64 binary for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
diff --git a/package.json b/package.json
index af5b570e..d595f8c2 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,8 @@
 {
   "name": "sass-embedded",
-  "version": "1.97.3",
+  "version": "1.104.1",
   "protocol-version": "3.2.0",
-  "compiler-version": "1.97.3",
+  "compiler-version": "1.104.1",
   "description": "Node.js library that communicates with Embedded Dart Sass using the Embedded Sass protocol",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
@@ -21,7 +21,7 @@
     "dist/**/*"
   ],
   "engines": {
-    "node": ">=16.0.0"
+    "node": ">=20.19.0"
   },
   "bin": {
     "sass": "dist/bin/sass.js"
@@ -41,29 +41,29 @@
     "test": "jest"
   },
   "optionalDependencies": {
-    "sass-embedded-all-unknown": "1.97.3",
-    "sass-embedded-android-arm": "1.97.3",
-    "sass-embedded-android-arm64": "1.97.3",
-    "sass-embedded-android-riscv64": "1.97.3",
-    "sass-embedded-android-x64": "1.97.3",
-    "sass-embedded-darwin-arm64": "1.97.3",
-    "sass-embedded-darwin-x64": "1.97.3",
-    "sass-embedded-linux-arm": "1.97.3",
-    "sass-embedded-linux-arm64": "1.97.3",
-    "sass-embedded-linux-musl-arm": "1.97.3",
-    "sass-embedded-linux-musl-arm64": "1.97.3",
-    "sass-embedded-linux-musl-riscv64": "1.97.3",
-    "sass-embedded-linux-musl-x64": "1.97.3",
-    "sass-embedded-linux-riscv64": "1.97.3",
-    "sass-embedded-linux-x64": "1.97.3",
-    "sass-embedded-unknown-all": "1.97.3",
-    "sass-embedded-win32-arm64": "1.97.3",
-    "sass-embedded-win32-x64": "1.97.3"
+    "sass-embedded-all-unknown": "1.104.1",
+    "sass-embedded-android-arm": "1.104.1",
+    "sass-embedded-android-arm64": "1.104.1",
+    "sass-embedded-android-riscv64": "1.104.1",
+    "sass-embedded-android-x64": "1.104.1",
+    "sass-embedded-darwin-arm64": "1.104.1",
+    "sass-embedded-darwin-x64": "1.104.1",
+    "sass-embedded-linux-arm": "1.104.1",
+    "sass-embedded-linux-arm64": "1.104.1",
+    "sass-embedded-linux-musl-arm": "1.104.1",
+    "sass-embedded-linux-musl-arm64": "1.104.1",
+    "sass-embedded-linux-musl-riscv64": "1.104.1",
+    "sass-embedded-linux-musl-x64": "1.104.1",
+    "sass-embedded-linux-riscv64": "1.104.1",
+    "sass-embedded-linux-x64": "1.104.1",
+    "sass-embedded-unknown-all": "1.104.1",
+    "sass-embedded-win32-arm64": "1.104.1",
+    "sass-embedded-win32-x64": "1.104.1"
   },
   "dependencies": {
     "@bufbuild/protobuf": "^2.5.0",
-    "colorjs.io": "^0.5.0",
-    "immutable": "^5.0.2",
+    "colorjs.io": "^0.7.0",
+    "immutable": "^5.1.5",
     "rxjs": "^7.4.0",
     "supports-color": "^8.1.1",
     "sync-child-process": "^1.0.2",
@@ -73,16 +73,17 @@
     "@bufbuild/buf": "^1.54.0",
     "@bufbuild/protoc-gen-es": "^2.5.0",
     "@eslint/eslintrc": "^3.3.3",
-    "@eslint/js": "^9.39.2",
+    "@eslint/js": "^10.0.1",
     "@types/buffer-builder": "^0.2.0",
     "@types/google-protobuf": "^3.7.2",
     "@types/jest": "^30.0.0",
-    "@types/node": "^25.0.3",
+    "@types/node": "^26.1.1",
     "@types/shelljs": "^0.10.0",
     "@types/supports-color": "^8.1.1",
-    "@types/tar": "^6.1.0",
+    "@types/tar": "^7.0.87",
     "@types/varint": "^6.0.1",
     "@types/yargs": "^17.0.4",
+    "@typescript/native": "npm:typescript@^7.0.2",
     "extract-zip": "^2.0.1",
     "gts": "^7.0.0",
     "jest": "^30.0.3",
@@ -91,9 +92,9 @@
     "simple-git": "^3.15.1",
     "source-map-js": "^1.0.2",
     "tar": "^7.4.3",
-    "ts-jest": "^29.0.5",
+    "ts-jest": "^29.4.11",
     "ts-node": "^10.2.1",
-    "typescript": "^5.0.2",
+    "typescript": "npm:@typescript/typescript6@^6.0.2",
     "yaml": "^2.2.1",
     "yargs": "^17.2.1"
   }
diff --git a/tool/prepare-optional-release.ts b/tool/prepare-optional-release.ts
index 9b7d695e..299568e1 100644
--- a/tool/prepare-optional-release.ts
+++ b/tool/prepare-optional-release.ts
@@ -8,11 +8,7 @@ import * as pkg from '../package.json';
 import * as utils from './utils';
 
 export type DartPlatform =
-  | 'android'
-  | 'linux'
-  | 'linux-musl'
-  | 'macos'
-  | 'windows';
+  'android' | 'linux' | 'linux-musl' | 'macos' | 'windows';
 export type DartArch = 'x64' | 'arm' | 'arm64' | 'riscv64';
 
 const argv = yargs(process.argv.slice(2))
diff --git a/tsconfig.json b/tsconfig.json
index 91520088..62d6d6bf 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -7,7 +7,9 @@
     "rootDir": ".",
     "useUnknownInCatchVariables": false,
     "declarationDir": "_types",
-    "lib": ["DOM"]
+    "lib": ["DOM"],
+    "types": ["node", "jest"],
+    "moduleResolution": "bundler",
   },
   "include": [
     "package.json",