diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 09460c5..0d4c0a0 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.6'
+          - '1.3'
           - '1'
 #          - 'nightly'
         os: