diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 04898239..3fcb5232 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -41,7 +41,7 @@ jobs:
 
       - run: opam exec -- dune build @install -p opentelemetry,opentelemetry-lwt,opentelemetry-client-ocurl,opentelemetry-cohttp-lwt
 
-      - run: opam install ocaml-protoc -y
+      - run: opam pin ocaml-protoc 2.3 -y
 
       - run: opam exec -- dune build @lint