diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3b60e33..37a0c14 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,7 +45,7 @@ jobs:
         swift:
           - 5.7
           - 5.8
-          # - 5.9
+          - 5.9
     container:
       image: swift:${{ matrix.swift }}
     steps: