diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 24b3fab..14ff5d7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - 3.0
+          - '3.0'
           - 3.1
           - 3.2
           - 3.3
@@ -24,7 +24,7 @@ jobs:
           - truffleruby-head
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}