diff --git a/.circleci/config.yml b/.circleci/config.yml
index dee5b31ee..dfe059ae5 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -437,7 +437,7 @@ jobs:
 
   validate_reqs_files:
     working_directory: ~/nucypher
-    <<: *python_37_base
+    <<: *python_36_base
     steps:
       - pipenv_install
       - run: