diff --git a/.github/workflows/build-z3-cache.yml b/.github/workflows/build-z3-cache.yml
index 375b182943..3898184c7e 100644
--- a/.github/workflows/build-z3-cache.yml
+++ b/.github/workflows/build-z3-cache.yml
@@ -45,7 +45,7 @@ jobs:
 
       - name: Restore or create cache
         id: cache-z3
-        uses: actions/cache@v5.0.5
+        uses: actions/cache@v6.0.0
         with:
           path: |
             build/z3
diff --git a/.github/workflows/ocaml.yaml b/.github/workflows/ocaml.yaml
index f9d872ebcc..10eaa043fb 100644
--- a/.github/workflows/ocaml.yaml
+++ b/.github/workflows/ocaml.yaml
@@ -21,7 +21,7 @@ jobs:
 
       # Cache ccache (shared across runs)
       - name: Cache ccache
-        uses: actions/cache@v5.0.5
+        uses: actions/cache@v6.0.0
         with:
           path: ~/.ccache
           key: ${{ runner.os }}-ccache-${{ github.sha }}
@@ -30,7 +30,7 @@ jobs:
 
       # Cache opam (compiler + packages)
       - name: Cache opam
-        uses: actions/cache@v5.0.5
+        uses: actions/cache@v6.0.0
         with:
           path: ~/.opam
           key: ${{ runner.os }}-opam-${{ matrix.ocaml-version }}-${{ github.sha }}