diff --git a/src/Catalyst.Protocol/Catalyst.Protocol.csproj b/src/Catalyst.Protocol/Catalyst.Protocol.csproj
index 914d46aa01..d525103e4c 100644
--- a/src/Catalyst.Protocol/Catalyst.Protocol.csproj
+++ b/src/Catalyst.Protocol/Catalyst.Protocol.csproj
@@ -14,7 +14,7 @@
     <Import Project="../Common.Projects.props" />
     <ItemGroup>
         <PackageReference Include="Dawn.Guard" Version="1.11.0" />
-        <PackageReference Include="Google.Protobuf" Version="3.9.1" />
+        <PackageReference Include="Google.Protobuf" Version="3.15.0" />
         <PackageReference Include="Grpc.Tools" Version="1.22.0" PrivateAssets="all" IncludeAssets="runtime; build; native; contentfiles; analyzers; buildtransitive" />
         <PackageReference Include="Serilog" Version="2.8.0" />
     </ItemGroup>
diff --git a/src/MultiFormats/MultiFormats.csproj b/src/MultiFormats/MultiFormats.csproj
index 3047e723eb..9aae00b38e 100644
--- a/src/MultiFormats/MultiFormats.csproj
+++ b/src/MultiFormats/MultiFormats.csproj
@@ -7,7 +7,7 @@
     <ItemGroup>
         <PackageReference Include="Common.Logging" Version="3.4.1" />
         <PackageReference Include="Portable.BouncyCastle" Version="1.8.5" />
-        <PackageReference Include="Google.Protobuf" Version="3.9.1" />
+        <PackageReference Include="Google.Protobuf" Version="3.15.0" />
         <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
         <PackageReference Include="protobuf-net" Version="2.4.0" />
         <PackageReference Include="SimpleBase" Version="1.3.1" />