diff --git a/.github/workflows/common.yml b/.github/workflows/common.yml
index 28691ac1..3e43a1da 100644
--- a/.github/workflows/common.yml
+++ b/.github/workflows/common.yml
@@ -74,7 +74,7 @@ jobs:
       DUNE_CI_ALIAS:            ${{ inputs.dune_alias }}
       COMPILER:                 ${{ inputs.compiler }}
       OCAML_COMPILER_GIT_REF:   'refs/pull/12861/head'
-      CUSTOM_COMPILER_VERSION:  '5.3.0+pr12861'
+      CUSTOM_COMPILER_VERSION:  '5.2.0+pr12861'
       CUSTOM_COMPILER_SRC:      'https://github.com/ocaml/ocaml/archive/refs/pull/12861/head.tar.gz'
       CUSTOM_OCAML_PKG_VERSION: ${{ inputs.custom_ocaml_package_version }}