diff --git a/.circleci/config.yml b/.circleci/config.yml
index c4d549adce..127a1a30f7 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -19,6 +19,7 @@ jobs:
             sudo .github/workflows/dependencies/install_spack
             python3 -m pip install -U pip
             python3 -m pip install -U packaging setuptools wheel
+            python3 -m pip install -U six
             python3 -m pip install -U numpy
             python3 -m pip install -U mpi4py
             python3 -m pip install -U pandas