diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index aa4e5de..535708c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,5 +1,5 @@
 env:
-  proto_version: '27.2'
+  proto_version: '27.3'
   USE_BAZEL_VERSION: '6.4.0'
 name: Conformance Runner
 on: [push]