diff --git a/csharp/csharp.csproj b/csharp/csharp.csproj
index fa6075d..4a55461 100644
--- a/csharp/csharp.csproj
+++ b/csharp/csharp.csproj
@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.11.4" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="NetMQ" Version="4.0.0.352-pre" />
   </ItemGroup>