diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 0f84af5..3125682 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -17,7 +17,7 @@ jobs:
         platform:
           - iOS
         swift:
-          - ^5.9
+          - ^5.8.1
     steps:
       - uses: actions/checkout@v2.3.4
       - uses: mxcl/xcodebuild@v1