diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7c1c4828a8..f5928fe1f6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -164,7 +164,7 @@ jobs:
       # matrix.ocaml_compiler may contain commas
       - name: Get OPAM cache key
         shell: bash
-        run: echo "opam_cache_key=opam-env-v7-${{ matrix.os }}-${{ matrix.ocaml_compiler }}-${{ hashFiles('*.opam') }}" | sed 's/,/-/g' >> $GITHUB_ENV
+        run: echo "opam_cache_key=opam-env-v8-${{ matrix.os }}-${{ matrix.ocaml_compiler }}-${{ hashFiles('*.opam') }}" | sed 's/,/-/g' >> $GITHUB_ENV
 
       - name: Restore OPAM environment
         id: cache-opam-env
@@ -180,7 +180,7 @@ jobs:
           key: ${{ env.opam_cache_key }}
 
       - name: Use OCaml ${{matrix.ocaml_compiler}}
-        uses: ocaml/setup-ocaml@v3.2.5
+        uses: ocaml/setup-ocaml@v3.3.2
         if: steps.cache-opam-env.outputs.cache-hit != 'true'
         with:
           ocaml-compiler: ${{matrix.ocaml_compiler}}