diff --git a/csharp/src/Apache.Arrow.Flight/Apache.Arrow.Flight.csproj b/csharp/src/Apache.Arrow.Flight/Apache.Arrow.Flight.csproj
index 58b65a3a713..2208c17327d 100644
--- a/csharp/src/Apache.Arrow.Flight/Apache.Arrow.Flight.csproj
+++ b/csharp/src/Apache.Arrow.Flight/Apache.Arrow.Flight.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
   
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.29.2" />
+    <PackageReference Include="Google.Protobuf" Version="3.29.3" />
     <PackageReference Include="Grpc.Net.Client" Version="2.65.0" />
     <PackageReference Include="Grpc.Tools" Version="2.68.1" PrivateAssets="All" />
     <PackageReference Include="System.Memory" Version="4.6.0" />
diff --git a/csharp/test/Apache.Arrow.Flight.TestWeb/Apache.Arrow.Flight.TestWeb.csproj b/csharp/test/Apache.Arrow.Flight.TestWeb/Apache.Arrow.Flight.TestWeb.csproj
index 08215ef323d..6368c8841b6 100644
--- a/csharp/test/Apache.Arrow.Flight.TestWeb/Apache.Arrow.Flight.TestWeb.csproj
+++ b/csharp/test/Apache.Arrow.Flight.TestWeb/Apache.Arrow.Flight.TestWeb.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.29.2" />
+    <PackageReference Include="Google.Protobuf" Version="3.29.3" />
     <PackageReference Include="Grpc.AspNetCore" Version="2.67.0" />
   </ItemGroup>