diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ac5f957..d46d7ca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,11 +16,11 @@ jobs:
       matrix:
         include:
           - pair:
-              elixir: 1.7.x
-              otp: 22.x
+              elixir: "1.7"
+              otp: "22"
           - pair:
-              elixir: 1.17.x
-              otp: 27.x
+              elixir: "1.18"
+              otp: "27"
             lint: lint
     steps:
       - uses: actions/checkout@v4