diff --git a/.github/workflows/copilot-setup-steps.yml b/.github/workflows/copilot-setup-steps.yml
index f993636..fcebed1 100644
--- a/.github/workflows/copilot-setup-steps.yml
+++ b/.github/workflows/copilot-setup-steps.yml
@@ -74,7 +74,7 @@ jobs:
         # drops the fetched Ghostty source and Zig package cache
         # under target/<profile>/build/libghostty-vt-sys-*/out/, and
         # we want the agent to reuse it instead of re-fetching.
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cargo/registry