diff --git a/SpeechToText/packages.config b/SpeechToText/packages.config
index 0761a82..760c657 100644
--- a/SpeechToText/packages.config
+++ b/SpeechToText/packages.config
@@ -8,7 +8,7 @@
   <package id="Google.Apis.Core" version="1.41.1" targetFramework="net461" />
   <package id="Google.Cloud.Speech.V1" version="1.3.0" targetFramework="net461" />
   <package id="Google.LongRunning" version="1.1.0" targetFramework="net461" />
-  <package id="Google.Protobuf" version="3.8.0" targetFramework="net461" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net461" />
   <package id="Grpc.Auth" version="1.22.0" targetFramework="net461" />
   <package id="Grpc.Core" version="1.22.1" targetFramework="net461" />
   <package id="Grpc.Core.Api" version="1.22.1" targetFramework="net461" />