diff --git a/clibs/messages/messages.csproj b/clibs/messages/messages.csproj
index aeb2ad95..2bbf7c6d 100644
--- a/clibs/messages/messages.csproj
+++ b/clibs/messages/messages.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.11.4" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Grpc.Core" Version="2.28.1" />
     <PackageReference Include="Grpc.Tools" Version="2.28.1">
       <PrivateAssets>all</PrivateAssets>
diff --git a/clibs/spellcheck/packages.config b/clibs/spellcheck/packages.config
index 0489e0e4..23979071 100644
--- a/clibs/spellcheck/packages.config
+++ b/clibs/spellcheck/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Google.Protobuf" version="3.11.4" targetFramework="net472" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net472" />
   <package id="System.Buffers" version="4.5.1" targetFramework="net472" />
   <package id="System.Memory" version="4.5.4" targetFramework="net472" />
   <package id="System.Numerics.Vectors" version="4.5.0" targetFramework="net472" />
diff --git a/clibs/utils/utils.csproj b/clibs/utils/utils.csproj
index bd23b722..e016bef4 100644
--- a/clibs/utils/utils.csproj
+++ b/clibs/utils/utils.csproj
@@ -24,7 +24,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.11.4" />
+    <PackageReference Include="Google.Protobuf" Version="3.15.0" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
     <PackageReference Include="Sepia.Globalization" Version="0.8.0" />
     <PackageReference Include="System.Text.Json" Version="4.7.1" />