diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 1fb4123..4ab951c 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -23,7 +23,7 @@ jobs:
       fail-fast: false
 
       matrix:
-        version: ['1.6', '1.7', '1.8']
+        version: ['1.6', '1.7', '1.8', '1.9', '1']
         os: [ubuntu-latest]
         arch: [x64]