diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 48a5bd1..bdf6620 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,6 @@ jobs:
           - ubuntu-latest
           - ubuntu-22.04
           - ubuntu-20.04
-          - ubuntu-18.04
           - macos-latest
           - macos-12
           - macos-11
@@ -24,7 +23,7 @@ jobs:
       SHARDS_OPTS: --ignore-crystal-version
     steps:
       - name: Download source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install Crystal
         uses: oprypin/install-crystal@v1