diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4f1a53b..b7612ac 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,6 +39,7 @@ jobs:
           - swift:5.2
           - swift:5.3
           - swift:5.4
+          - swift:5.5
     container:
       image: ${{ matrix.tag }}
     steps: