diff --git a/.github/workflows/blueprint.yml b/.github/workflows/blueprint.yml
index 234462c..9ef6ad9 100644
--- a/.github/workflows/blueprint.yml
+++ b/.github/workflows/blueprint.yml
@@ -37,7 +37,7 @@ jobs:
         run: ~/.elan/bin/lake build PhD
 
       - name: Cache mathlib API docs
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             .lake/build/doc/Init
diff --git a/.github/workflows/build-project.yml b/.github/workflows/build-project.yml
index bae8a5a..62a3b5e 100644
--- a/.github/workflows/build-project.yml
+++ b/.github/workflows/build-project.yml
@@ -47,7 +47,7 @@ jobs:
         run: ~/.elan/bin/lake exe cache get || true
 
       - name: Cache build artifacts
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             .lake/build