diff --git a/.circleci/config.yml b/.circleci/config.yml
index 164dc98a0..9cfc74911 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -36,13 +36,13 @@ commands:
     steps:
       - restore_cached_venv:
           venv_name: v1-pyspec-05
-          reqs_checksum: '{{ checksum "test_libs/pyspec/requirements.txt" }}-{{ checksum "test_libs/pyspec/requirements-testing.txt" }}--{{ checksum "deposit_contract/requirements-testing.txt" }}'
+          reqs_checksum: cache-v1-{{ checksum "test_libs/pyspec/requirements.txt" }}-{{ checksum "test_libs/pyspec/requirements-testing.txt" }}-{{ checksum "deposit_contract/requirements-testing.txt" }}
   save_default_cached_venv:
     description: Save a venv into a cache with default keys"
     steps:
       - save_cached_venv:
           venv_name: v1-pyspec-05
-          reqs_checksum: '{{ checksum "test_libs/pyspec/requirements.txt" }}-{{ checksum "test_libs/pyspec/requirements-testing.txt" }}--{{ checksum "deposit_contract/requirements-testing.txt" }}'
+          reqs_checksum: cache-v1-{{ checksum "test_libs/pyspec/requirements.txt" }}-{{ checksum "test_libs/pyspec/requirements-testing.txt" }}-{{ checksum "deposit_contract/requirements-testing.txt" }}
           venv_path: ./test_libs/pyspec/venv
 jobs:
   checkout_specs: