diff --git a/contrib/ci-workers/vars/default.yml b/contrib/ci-workers/vars/default.yml
index 9aa79da5e..9afb8c55f 100644
--- a/contrib/ci-workers/vars/default.yml
+++ b/contrib/ci-workers/vars/default.yml
@@ -36,4 +36,5 @@ buildbot_modules:
 
 # Python modules required to run the Zcash RPC test suite
 rpc_test_modules:
+  - pyblake2
   - pyzmq