diff --git a/.circleci/config.yml b/.circleci/config.yml
index fcd680cd6b..dff1d136b6 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -178,10 +178,8 @@ commands:
           key: pip-cache-{{ arch }}-<< parameters.py-version >>
       - restore_cache:
           keys:
-          - python-deps-v3-{{ arch }}-<< parameters.py-version >>-{{ checksum "requirements/requirements-ci.txt" }}
-# hack: solving a inter-PR cache problem
-          - python-deps-v3-{{ arch }}-<< parameters.py-version >>-2uPiIM_pNv5neMjXtHsw_aV6BQGcFOekCBcy7TJEkhI=
-          - python-deps-v3-{{ arch }}-<< parameters.py-version >>-
+          - python-deps-v4-{{ arch }}-<< parameters.py-version >>-{{ checksum "requirements/requirements-ci.txt" }}
+          - python-deps-v4-{{ arch }}-<< parameters.py-version >>-
       - run:
           name: Creating virtualenv
           command: |