diff --git a/spannerlib/wrappers/spannerlib-dotnet/spannerlib-dotnet-grpc-v1/spannerlib-dotnet-grpc-v1.csproj b/spannerlib/wrappers/spannerlib-dotnet/spannerlib-dotnet-grpc-v1/spannerlib-dotnet-grpc-v1.csproj
index 0545d93c..f64ecf27 100644
--- a/spannerlib/wrappers/spannerlib-dotnet/spannerlib-dotnet-grpc-v1/spannerlib-dotnet-grpc-v1.csproj
+++ b/spannerlib/wrappers/spannerlib-dotnet/spannerlib-dotnet-grpc-v1/spannerlib-dotnet-grpc-v1.csproj
@@ -11,7 +11,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Google.Cloud.Spanner.V1" Version="5.8.0" />
-    <PackageReference Include="Google.Protobuf" Version="3.33.2" />
+    <PackageReference Include="Google.Protobuf" Version="3.33.3" />
     <PackageReference Include="Grpc.Net.Client" Version="2.71.0" />
   </ItemGroup>
 
diff --git a/spannerlib/wrappers/spannerlib-java/pom.xml b/spannerlib/wrappers/spannerlib-java/pom.xml
index 13a43669..54dcff37 100644
--- a/spannerlib/wrappers/spannerlib-java/pom.xml
+++ b/spannerlib/wrappers/spannerlib-java/pom.xml
@@ -30,7 +30,7 @@
       <dependency>
         <groupId>com.google.protobuf</groupId>
         <artifactId>protobuf-bom</artifactId>
-        <version>4.33.2</version>
+        <version>4.33.3</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>