diff --git a/Phenix.Protobufconcat/Phenix.Protobufconcat.csproj b/Phenix.Protobufconcat/Phenix.Protobufconcat.csproj
index 67abf50..5544074 100644
--- a/Phenix.Protobufconcat/Phenix.Protobufconcat.csproj
+++ b/Phenix.Protobufconcat/Phenix.Protobufconcat.csproj
@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.10.0" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Google.Protobuf.Tools" Version="3.10.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.6">
       <PrivateAssets>all</PrivateAssets>