diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c646366..cb59a72 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
     timeout-minutes: 15
     strategy:
       matrix:
-        image: ["swift:5.9", "swift:5.10", "swift:6.0"]
+        image: ["swift:6.0"]
     container:
       image: ${{ matrix.image }}
     steps: