diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7dbc71960e4..183244714c1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -139,7 +139,7 @@ jobs:
         path: |
           ${{ env.OPAMBSROOT }}/**
           ~/.cache/opam-local/bin/**
-        key: opam-${{ runner.os }}-${{ env.OPAMBSVERSION }}-${{ matrix.ocamlv }}-${{ env.OPAM_REPO_SHA }}-${{ hashFiles ('.github/scripts/opam-bs-cache.sh', '.github/scripts/preamble.sh') }}
+        key: opam-${{ runner.os }}-${{ env.OPAMBSVERSION }}-${{ matrix.ocamlv }}-${{ env.OPAM_REPO_SHA }}-${{ hashFiles ('.github/scripts/opam-bs-cache.sh', '.github/scripts/preamble.sh', '*.opam') }}
     - name: opam root cache
       if: steps.opam-bootstrap.outputs.cache-hit != 'true'
       run: bash -exu .github/scripts/opam-bs-cache.sh