diff --git a/src/Chinchilla.Serializers.Protobuf.Specifications/Chinchilla.Serializers.Protobuf.Specifications.csproj b/src/Chinchilla.Serializers.Protobuf.Specifications/Chinchilla.Serializers.Protobuf.Specifications.csproj
index 2cc4bcc..53decd6 100644
--- a/src/Chinchilla.Serializers.Protobuf.Specifications/Chinchilla.Serializers.Protobuf.Specifications.csproj
+++ b/src/Chinchilla.Serializers.Protobuf.Specifications/Chinchilla.Serializers.Protobuf.Specifications.csproj
@@ -20,7 +20,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.4.1" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Machine.Specifications.Runner.VisualStudio" Version="2.5.1" />
     <PackageReference Include="Machine.Specifications.Should" Version="0.11.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0" />
diff --git a/src/Chinchilla.Serializers.Protobuf/Chinchilla.Serializers.Protobuf.csproj b/src/Chinchilla.Serializers.Protobuf/Chinchilla.Serializers.Protobuf.csproj
index 1ceb666..4ca01ab 100644
--- a/src/Chinchilla.Serializers.Protobuf/Chinchilla.Serializers.Protobuf.csproj
+++ b/src/Chinchilla.Serializers.Protobuf/Chinchilla.Serializers.Protobuf.csproj
@@ -25,7 +25,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.4.1" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
   </ItemGroup>
 
   <ItemGroup>