diff --git a/.circleci/config.yml b/.circleci/config.yml
index fd792c1..4fe2604 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -155,6 +155,10 @@ jobs:
             # This flag is important, due to an open upstream Poetry issue:
             # https://github.com/python-poetry/poetry/issues/7184
             poetry install --no-ansi
+      - run:
+          name: Install test dependencies
+          command: |
+            sudo apt-get install -y libqt5gui5 --no-install-recommends
       - run:
           name: Prepare cache directory
           command: |