diff --git a/eng/Packages.Data.props b/eng/Packages.Data.props
index c7fcf2a8d096..b074d1d337a4 100644
--- a/eng/Packages.Data.props
+++ b/eng/Packages.Data.props
@@ -493,7 +493,7 @@
   </ItemGroup>
 
   <PropertyGroup>
-    <TestProxyVersion>1.0.0-dev.20250930.1</TestProxyVersion>
+    <TestProxyVersion>1.0.0-dev.20251209.1</TestProxyVersion>
     <UnbrandedGeneratorVersion>1.0.0-alpha.20251210.1</UnbrandedGeneratorVersion>
     <AzureGeneratorVersion>1.0.0-alpha.20251205.1</AzureGeneratorVersion>
   </PropertyGroup>
diff --git a/eng/common/testproxy/target_version.txt b/eng/common/testproxy/target_version.txt
index d649bab76c54..151749f5d2ae 100644
--- a/eng/common/testproxy/target_version.txt
+++ b/eng/common/testproxy/target_version.txt
@@ -1 +1 @@
-1.0.0-dev.20251022.1
+1.0.0-dev.20251209.1