diff --git a/test-requirements.txt b/test-requirements.txt
index d0167b2..412961d 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,7 @@ pytest-cov
 sphinx<5.0.0
 sphinxcontrib-bibtex
 sphinx-paramlinks
-python-docs-theme
+python-docs-theme<2022.1
 matplotlib
 scipy>=1.6.0
 scikit-learn