diff --git a/docs/codeql/reusables/supported-versions-compilers.rst b/docs/codeql/reusables/supported-versions-compilers.rst
index 7a88dd035c2a..a3ca1fdcbd94 100644
--- a/docs/codeql/reusables/supported-versions-compilers.rst
+++ b/docs/codeql/reusables/supported-versions-compilers.rst
@@ -18,7 +18,7 @@
    .NET 5, .NET 6, .NET 7, .NET 8, .NET 9, .NET 10","``.sln``, ``.slnx``, ``.csproj``, ``.cs``, ``.cshtml``, ``.xaml``"
    GitHub Actions,"Not applicable",Not applicable,"``.github/workflows/*.yml``, ``.github/workflows/*.yaml``, ``**/action.yml``, ``**/action.yaml``"
    Go (aka Golang), "Go up to 1.26", "Go 1.11 or more recent", ``.go``
-   Java,"Java 7 to 26 [6]_","javac (OpenJDK and Oracle JDK),
+   Java,"Java 7 to 27 [6]_","javac (OpenJDK and Oracle JDK),
 
    Eclipse compiler for Java (ECJ) [7]_",``.java``
    Kotlin,"Kotlin 1.8.0 to 2.4.0\ *x*","kotlinc",``.kt``
@@ -36,7 +36,7 @@
     .. [3] Objective-C, Objective-C++, C++/CLI, and C++/CX are not supported.
     .. [4] Support for the clang-cl compiler is preliminary.
     .. [5] Support for the Arm Compiler (armcc) is preliminary.
-    .. [6] Builds that execute on Java 7 to 26 can be analyzed. The analysis understands standard language features in Java 8 to 26; "preview" and "incubator" features are not supported. Source code using Java language versions older than Java 8 are analyzed as Java 8 code.
+    .. [6] Builds that execute on Java 7 to 27 can be analyzed. The analysis understands standard language features in Java 8 to 27; "preview" and "incubator" features are not supported. Source code using Java language versions older than Java 8 are analyzed as Java 8 code.
     .. [7] ECJ is supported when the build invokes it via the Maven Compiler plugin or the Takari Lifecycle plugin.
     .. [8] JSX and Flow code, YAML, JSON, HTML, and XML files may also be analyzed with JavaScript files.
     .. [9] The extractor requires Python 3 to run. To analyze Python 2.7 you should install both versions of Python.
diff --git a/java/ql/integration-tests/java/buildless-erroneous/ExtractorInformation.expected b/java/ql/integration-tests/java/buildless-erroneous/ExtractorInformation.expected
index b43963e4aca8..8f3146c677bb 100644
--- a/java/ql/integration-tests/java/buildless-erroneous/ExtractorInformation.expected
+++ b/java/ql/integration-tests/java/buildless-erroneous/ExtractorInformation.expected
@@ -2,7 +2,7 @@
 | Number of calls with call target | 1 |
 | Number of calls with missing call target | 4 |
 | Number of diagnostics from CodeQL Java extractor with severity 5 | 10 |
-| Number of diagnostics from CodeQL Java extractor with severity 6 | 2 |
+| Number of diagnostics from CodeQL Java extractor with severity 6 | 1 |
 | Number of expressions with known type | 1 |
 | Number of expressions with unknown type | 6 |
 | Number of files | 606 |
@@ -12,6 +12,6 @@
 | Number of lines of code with extension java | 7 |
 | Percentage of calls with call target | 20 |
 | Percentage of expressions with known type | 14 |
-| Total number of diagnostics from CodeQL Java extractor | 12 |
+| Total number of diagnostics from CodeQL Java extractor | 11 |
 | Total number of lines | 13 |
 | Total number of lines with extension java | 13 |
diff --git a/java/ql/src/change-notes/2026-07-03-support-java-27.md b/java/ql/src/change-notes/2026-07-03-support-java-27.md
new file mode 100644
index 000000000000..36e815e70cda
--- /dev/null
+++ b/java/ql/src/change-notes/2026-07-03-support-java-27.md
@@ -0,0 +1,4 @@
+---
+category: minorAnalysis
+---
+* The Java extractor and QL libraries now support Java 27.
diff --git a/java/ql/test/library-tests/errortype/Diags.expected b/java/ql/test/library-tests/errortype/Diags.expected
index dfd80b2466a1..722f0c1e9c0e 100644
--- a/java/ql/test/library-tests/errortype/Diags.expected
+++ b/java/ql/test/library-tests/errortype/Diags.expected
@@ -1,7 +1,6 @@
-| Test.java:0:0:0:0 | 2 javac errors |
 | Test.java:6:5:6:15 | Unknown or erroneous type for expression of kind TypeAccess |
 | Test.java:6:23:6:39 | Unexpected symbol for constructor: new NoSuchClass() |
 | Test.java:6:23:6:39 | Unknown or erroneous type for expression of kind ClassInstanceCreation |
 | Test.java:6:27:6:37 | Unknown or erroneous type for expression of kind TypeAccess |
 | Test.java:7:12:7:14 | Unknown or erroneous type for expression of kind VarAccess |
-| file://:0:0:0:0 | 2 errors during annotation processing |
+| file://:0:0:0:0 | 1 errors during annotation processing |
diff --git a/java/ql/test/library-tests/errortype/Test.java b/java/ql/test/library-tests/errortype/Test.java
index c393faf75990..d108117fd28b 100644
--- a/java/ql/test/library-tests/errortype/Test.java
+++ b/java/ql/test/library-tests/errortype/Test.java
@@ -10,8 +10,7 @@ public NoSuchClass test() {
 }
 
 // Diagnostic Matches: Unexpected symbol for constructor: new NoSuchClass()
-// Diagnostic Matches: 2 javac errors
-// Diagnostic Matches: 2 errors during annotation processing
+// Diagnostic Matches: 1 errors during annotation processing
 // Diagnostic Matches: Unknown or erroneous type for expression of kind TypeAccess
 // Diagnostic Matches: Unknown or erroneous type for expression of kind ClassInstanceCreation
 // Diagnostic Matches: Unknown or erroneous type for expression of kind VarAccess