diff --git a/.github/workflows/interop_tests.yml b/.github/workflows/interop_tests.yml
index 70127eb9..5ab10236 100644
--- a/.github/workflows/interop_tests.yml
+++ b/.github/workflows/interop_tests.yml
@@ -1,5 +1,5 @@
 name: Interop Tests
-on: [pull_request]
+on: [push]
 env:
   CARGO_TERM_COLOR: always
   SSH_AUTH_SOCK: /tmp/ssh_agent.sock
@@ -30,7 +30,7 @@ jobs:
           cp -r ../../mls-rs/test_harness_integration/configs mls-rs-configs
           go env -w GOPROXY=direct
           go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
-          go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+          go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@5051eea
           export GOPATH=$HOME/go
           export GOBIN=$GOPATH/bin
           export PATH=$PATH:$GOROOT:$GOPATH:$GOBIN