diff --git a/CHANGELOG.md b/CHANGELOG.md
index ea1fe04c1..9e83bdeed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@
 * [#2786](https://github.com/ruby-grape/grape/pull/2786): Make route `requirements` and `anchor` explicit keyword arguments and first-class endpoint inputs instead of opaque `route_options` keys - [@ericproulx](https://github.com/ericproulx).
 * [#2788](https://github.com/ruby-grape/grape/pull/2788): Compare the base API instead of `to_s` when refreshing a mounted app - [@ericproulx](https://github.com/ericproulx).
 * [#2796](https://github.com/ruby-grape/grape/pull/2796): Remove `Grape::Util::ReverseStackableValues`, storing rescue handlers in plain per-scope hashes merged over `InheritableSetting#parent` - [@ericproulx](https://github.com/ericproulx).
+* [#2806](https://github.com/ruby-grape/grape/pull/2806): Internalize versioning state behind `Grape::Util::InheritableSetting` accessors (`version`, `version_options`, `root_prefix`, `cascade` / `cascade_defined?`) - [@ericproulx](https://github.com/ericproulx).
 * Your contribution here.
 
 #### Fixes
diff --git a/UPGRADING.md b/UPGRADING.md
index 9bd07d5df..8aad0fcd5 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -82,6 +82,10 @@ A route's declared params were previously carried inside the `route_options` bag
 
 Like `params` above, a route's `requirements` and `anchor` were previously carried inside the `route_options` bag. They are now composed into their own endpoint inputs (`Grape::Endpoint::Options` gains `:requirements` and `:anchor` members, and `Grape::Endpoint.new` gains `requirements:` and `anchor:` keywords) and exposed only through the `route.requirements` and `route.anchor` readers. `route.options[:requirements]` and `route.options[:anchor]` now return `nil` — including for a mount's `anchor: false`. Nothing in Grape or grape-swagger read them that way, so this only affects code that reached into the options Hash for these keys directly.
 
+#### Versioning state is recorded through `InheritableSetting` accessors
+
+The nearest-wins scalars written by the `version`, `prefix` and `cascade` DSL methods are now recorded and read through dedicated accessors on `Grape::Util::InheritableSetting` (`version` / `version=`, `version_options` / `version_options=`, `root_prefix` / `root_prefix=`, `cascade` / `cascade=`) instead of raw `namespace_inheritable` keys. `cascade` is presence-sensitive — an explicit `nil` is distinct from never-set — so the accessor family includes `cascade_defined?`, absorbing the `namespace_inheritable.key?(:cascade)` checks previously spelled out in `DSL::Routing#cascade` and `Grape::API::Instance#cascade?`. The keys' storage is unchanged for now, so `namespace_inheritable[:version]` and friends still return the same values, but they should be considered internal.
+
 ### Upgrading to >= 3.3
 
 #### Minimum required Ruby is now 3.3
diff --git a/lib/grape/api/instance.rb b/lib/grape/api/instance.rb
index c9e39a3ff..49b874a2a 100644
--- a/lib/grape/api/instance.rb
+++ b/lib/grape/api/instance.rb
@@ -134,9 +134,9 @@ def call(env)
       # errors from reaching upstream. This is effectivelly done by unsetting
       # X-Cascade. Default :cascade is true.
       def cascade?
-        namespace_inheritable = self.class.inheritable_setting.namespace_inheritable
-        return namespace_inheritable[:cascade] if namespace_inheritable.key?(:cascade)
-        return namespace_inheritable[:version_options].cascade if namespace_inheritable[:version_options]
+        setting = self.class.inheritable_setting
+        return setting.cascade if setting.cascade_defined?
+        return setting.version_options.cascade if setting.version_options
 
         true
       end
diff --git a/lib/grape/dsl/routing.rb b/lib/grape/dsl/routing.rb
index 20bbc7d07..dcc8964d3 100644
--- a/lib/grape/dsl/routing.rb
+++ b/lib/grape/dsl/routing.rb
@@ -16,9 +16,9 @@ def mounted(&block)
       end
 
       def cascade(value = nil)
-        return inheritable_setting.namespace_inheritable.key?(:cascade) ? !inheritable_setting.namespace_inheritable[:cascade].nil? : true if value.nil?
+        return inheritable_setting.cascade_defined? ? !inheritable_setting.cascade.nil? : true if value.nil?
 
-        inheritable_setting.namespace_inheritable[:cascade] = value
+        inheritable_setting.cascade = value
       end
 
       # Specify an API version.
@@ -72,13 +72,13 @@ def version(*args, using: :path, cascade: true, parameter: 'apiver', strict: fal
 
         if block
           within_namespace do
-            inheritable_setting.namespace_inheritable[:version] = requested_versions
-            inheritable_setting.namespace_inheritable[:version_options] = options
+            inheritable_setting.version = requested_versions
+            inheritable_setting.version_options = options
             instance_eval(&block)
           end
         else
-          inheritable_setting.namespace_inheritable[:version] = requested_versions
-          inheritable_setting.namespace_inheritable[:version_options] = options
+          inheritable_setting.version = requested_versions
+          inheritable_setting.version_options = options
         end
 
         @versions&.last
@@ -86,9 +86,9 @@ def version(*args, using: :path, cascade: true, parameter: 'apiver', strict: fal
 
       # Define a root URL prefix for your entire API.
       def prefix(prefix = nil)
-        return inheritable_setting.namespace_inheritable[:root_prefix] if prefix.nil?
+        return inheritable_setting.root_prefix if prefix.nil?
 
-        inheritable_setting.namespace_inheritable[:root_prefix] = prefix.to_s
+        inheritable_setting.root_prefix = prefix.to_s
       end
 
       # Create a scope without affecting the URL.
diff --git a/lib/grape/dsl/version_options.rb b/lib/grape/dsl/version_options.rb
index 0cd6c6598..908f78ffe 100644
--- a/lib/grape/dsl/version_options.rb
+++ b/lib/grape/dsl/version_options.rb
@@ -4,7 +4,7 @@ module Grape
   module DSL
     # Immutable value object holding the resolved options from
     # +Grape::DSL::Routing#version+. Stored on the inheritable settings as
-    # +namespace_inheritable[:version_options]+ and read by internal call
+    # +Grape::Util::InheritableSetting#version_options+ and read by internal call
     # sites (`Path`, `Endpoint`, `API::Instance#cascade?`,
     # `Middleware::Versioner::Base`) via accessors.
     #
diff --git a/lib/grape/endpoint.rb b/lib/grape/endpoint.rb
index 9502cdc2c..f54cbf976 100644
--- a/lib/grape/endpoint.rb
+++ b/lib/grape/endpoint.rb
@@ -292,8 +292,8 @@ def to_routes
       params = config.params
       path_settings = prepare_default_path_settings
       forward_match = bare_rack_app?
-      version = prepare_version(inheritable_setting.namespace_inheritable[:version])
-      prefix = inheritable_setting.namespace_inheritable[:root_prefix]
+      version = prepare_version(inheritable_setting.version)
+      prefix = inheritable_setting.root_prefix
       requirements = prepare_routes_requirements(config.requirements)
       anchor = config.anchor
       settings = inheritable_setting.route.except(:declared_params, :saved_validations)
@@ -351,12 +351,12 @@ def build_stack
 
       stack.concat inheritable_setting.namespace_stackable[:middleware]
 
-      if inheritable_setting.namespace_inheritable[:version].present?
-        version_options = inheritable_setting.namespace_inheritable[:version_options]
+      if inheritable_setting.version.present?
+        version_options = inheritable_setting.version_options
         stack.use Grape::Middleware::Versioner.using(version_options.using),
-                  versions: inheritable_setting.namespace_inheritable[:version].flatten,
+                  versions: inheritable_setting.version.flatten,
                   version_options:,
-                  prefix: inheritable_setting.namespace_inheritable[:root_prefix],
+                  prefix: inheritable_setting.root_prefix,
                   mount_path: inheritable_setting.namespace_stackable[:mount_path].first
       end
 
diff --git a/lib/grape/util/inheritable_setting.rb b/lib/grape/util/inheritable_setting.rb
index 912b1f68d..7cb6e8731 100644
--- a/lib/grape/util/inheritable_setting.rb
+++ b/lib/grape/util/inheritable_setting.rb
@@ -106,6 +106,53 @@ def namespace_stackable_with_hash(key)
         data.each_with_object({}) { |value, result| result.deep_merge!(value) }
       end
 
+      # Versioning state recorded by the routing DSL (see DSL::Routing):
+      # +version+ holds the Array of version strings registered by the
+      # +version+ DSL method, +version_options+ its DSL::VersionOptions
+      # value object, and +root_prefix+ the path prefix set by +prefix+.
+      # Nearest-wins scalars with plain += writers; readers return nil when
+      # never set; the backing store is an internal detail.
+      def version
+        namespace_inheritable[:version]
+      end
+
+      def version=(versions)
+        namespace_inheritable[:version] = versions
+      end
+
+      def version_options
+        namespace_inheritable[:version_options]
+      end
+
+      def version_options=(options)
+        namespace_inheritable[:version_options] = options
+      end
+
+      def root_prefix
+        namespace_inheritable[:root_prefix]
+      end
+
+      def root_prefix=(prefix)
+        namespace_inheritable[:root_prefix] = prefix
+      end
+
+      # Cascade flag assigned by the +cascade+ DSL. An explicit nil is
+      # meaningful and distinct from never-set (the backing store is
+      # key-presence based), so #cascade_defined? reports whether any scope
+      # assigned it — Grape::API::Instance#cascade? falls back to the
+      # version options' cascade, then to true, when it was never assigned.
+      def cascade
+        namespace_inheritable[:cascade]
+      end
+
+      def cascade=(value)
+        namespace_inheritable[:cascade] = value
+      end
+
+      def cascade_defined?
+        namespace_inheritable.key?(:cascade)
+      end
+
       # Rescue-handler maps registered by +rescue_from+, keyed by exception
       # class and merged so a nested scope's handler wins. Record them with
       # #add_rescue_handlers; the backing store is an internal detail.
diff --git a/spec/grape/dsl/routing_spec.rb b/spec/grape/dsl/routing_spec.rb
index 57afe0c47..262c69334 100644
--- a/spec/grape/dsl/routing_spec.rb
+++ b/spec/grape/dsl/routing_spec.rb
@@ -24,8 +24,8 @@ class << self
     it 'sets a version for route' do
       version = 'v1'
       expect(subject.version(version)).to eq(version)
-      expect(subject.inheritable_setting.namespace_inheritable[:version]).to eq([version])
-      expect(subject.inheritable_setting.namespace_inheritable[:version_options]).to eq(Grape::DSL::VersionOptions.new)
+      expect(subject.inheritable_setting.version).to eq([version])
+      expect(subject.inheritable_setting.version_options).to eq(Grape::DSL::VersionOptions.new)
     end
   end
 
@@ -33,7 +33,7 @@ class << self
     it 'sets a prefix for route' do
       prefix = '/api'
       subject.prefix prefix
-      expect(subject.inheritable_setting.namespace_inheritable[:root_prefix]).to eq(prefix)
+      expect(subject.inheritable_setting.root_prefix).to eq(prefix)
     end
   end