diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 12b1a865..286f06f5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,7 @@ jobs:
       with:
         ghc-version: ${{ matrix.ghc }}
 
-    - uses: actions/cache@v5
+    - uses: actions/cache@v6
       with:
         path: |
           ${{ steps.setup-haskell-cabal.outputs.cabal-store }}
@@ -157,7 +157,7 @@ jobs:
         ghc-version: '9.6.7' # huh?
 
     - name: Cache stack things
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: |
           ~/.stack