diff --git a/CHANGELOG.md b/CHANGELOG.md
index efb437d6b..6ec26b378 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,9 +2,9 @@ Important changes to data models, configuration, and migrations between each
 AppEngine version, listed here to ease deployment and troubleshooting.
 
 ## Next Release (replace with git tag when deployed)
- * Bump runtimeVersion to `2025.12.02`.
- * Upgraded stable Dart analysis SDK to `3.10.3`
- * Upgraded stable Flutter analysis SDK to `3.38.3`.
+ * Bump runtimeVersion to `2025.12.09`.
+ * Upgraded stable Dart analysis SDK to `3.10.4`
+ * Upgraded stable Flutter analysis SDK to `3.38.4`.
 
 ## `20251127t092900-all`
  * Bump runtimeVersion to `2025.11.25`.
diff --git a/Dockerfile.worker b/Dockerfile.worker
index efc3fede3..6fa2d30e7 100644
--- a/Dockerfile.worker
+++ b/Dockerfile.worker
@@ -23,10 +23,10 @@ RUN mkdir -p /home/worker/config/dart-stable
 RUN mkdir -p /home/worker/config/flutter-stable
 
 # Setup Dart SDK into /home/worker/dart/{stable,preview}/
-RUN XDG_CONFIG_HOME=/home/worker/config/dart-stable tool/setup-dart.sh /home/worker/dart/stable 3.10.3
+RUN XDG_CONFIG_HOME=/home/worker/config/dart-stable tool/setup-dart.sh /home/worker/dart/stable 3.10.4
 
 # Setup Flutter SDK into /home/worker/flutter/{stable,preview}/
-RUN XDG_CONFIG_HOME=/home/worker/config/flutter-stable tool/setup-flutter.sh /home/worker/flutter/stable 3.38.3
+RUN XDG_CONFIG_HOME=/home/worker/config/flutter-stable tool/setup-flutter.sh /home/worker/flutter/stable 3.38.4
 
 # Setup webp
 RUN tool/setup-webp.sh /home/worker/bin
diff --git a/app/lib/shared/versions.dart b/app/lib/shared/versions.dart
index 17a0c1c14..d42c8638d 100644
--- a/app/lib/shared/versions.dart
+++ b/app/lib/shared/versions.dart
@@ -24,7 +24,7 @@ final RegExp runtimeVersionPattern = RegExp(r'^\d{4}\.\d{2}\.\d{2}$');
 /// when the version switch happens.
 const _acceptedRuntimeVersions = <String>[
   // The current [runtimeVersion].
-  '2025.12.02',
+  '2025.12.09',
   // Fallback runtime versions.
   '2025.11.25',
   '2025.11.18',
@@ -62,8 +62,8 @@ bool shouldGCVersion(String version) =>
 
 // keep in-sync with SDK version in .github/workflows/all-test.yml and Dockerfile.app
 final String runtimeSdkVersion = '3.10.1';
-final String toolStableDartSdkVersion = '3.10.3';
-final String toolStableFlutterSdkVersion = '3.38.3';
+final String toolStableDartSdkVersion = '3.10.4';
+final String toolStableFlutterSdkVersion = '3.38.4';
 
 final semanticToolStableDartSdkVersion = Version.parse(
   toolStableDartSdkVersion,