diff --git a/core_gems.rb b/core_gems.rb
index 20c1a955..5ec7b64b 100644
--- a/core_gems.rb
+++ b/core_gems.rb
@@ -11,6 +11,6 @@
 download "tzinfo-data", "1.2016.5"
 unless windows?
   # Gems that don't need to be fetched explicitly on Windows.
-  fetch "google-protobuf", "3.14.0"
+  fetch "google-protobuf", "3.15.8"
   fetch "grpc", "1.20.0"
 end