diff --git a/.github/workflows/ci_nightly.yml b/.github/workflows/ci_nightly.yml
index 308cc1d8ca8..b200cbc464b 100644
--- a/.github/workflows/ci_nightly.yml
+++ b/.github/workflows/ci_nightly.yml
@@ -37,13 +37,13 @@ jobs:
         with:
           tool: just,cargo-nextest
       # Run the tests:
-      - uses: mathiasvr/command-output@v2.0.0
+      - uses: mathiasvr/command-output@34408ea3d0528273faff3d9e201761ae96106cd0
         with:
-          run: just nextest-slow ${{ matrix.type }}
+          run: just nextest-slow1 ${{ matrix.type }}
         id: run_nextest
 
       - name: Notify in Zulip about failures
-        uses: zulip/github-actions-zulip/send-message@v1
+        uses: zulip/github-actions-zulip/send-message@08b6fbd07f5834e5b930a85bc7740e9fd44ab2e7
         if: always() && steps.run_nextest.conclusion == 'failure'
         with:
           api-key: ${{ secrets.ZULIP_API_KEY }}