diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8991947d..7c844b81 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,6 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
+          - '1.5'
           - '1.6'
           - '1'
           - 'nightly'