diff --git a/.github/workflows/ubuntu_tests.yml b/.github/workflows/ubuntu_tests.yml
index 81bab713..3c6572f4 100644
--- a/.github/workflows/ubuntu_tests.yml
+++ b/.github/workflows/ubuntu_tests.yml
@@ -8,7 +8,7 @@ jobs:
         python-version:
           - 2.7.18
           - 3.5.10
-          - 3.6.13
+          - 3.6.15
           - 3.7.10
           - 3.8.10
           - 3.9.5