diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c6c4f774..9143c625 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,9 +18,9 @@ jobs:
     runs-on: ubuntu-22.04
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
       
-      - uses: r-lib/actions/setup-r@v2
+      - uses: r-lib/actions/setup-r@{"message":"Not Found","documentation_url":"https://docs.github.com/rest"}
         with:
           r-version: 4.3.1
           use-public-rspm: true
@@ -43,9 +43,9 @@ jobs:
         R: [ '4.3.1' ]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
       
-      - uses: r-lib/actions/setup-r@v2
+      - uses: r-lib/actions/setup-r@{"message":"Not Found","documentation_url":"https://docs.github.com/rest"}
         with:
           r-version: ${{ matrix.R }}