diff --git a/concept_explanations/requirements.txt b/concept_explanations/requirements.txt
index 89ee9bc8869..0aa9adc765c 100644
--- a/concept_explanations/requirements.txt
+++ b/concept_explanations/requirements.txt
@@ -17,7 +17,7 @@ numpydoc==0.6.0
 pandas==0.25.0
 py==1.4.33
 pyparsing==2.4.0
-pytest==3.0.7
+pytest==9.0.3
 python-dateutil==2.8.0
 pytz==2017.2
 QtPy==1.2.1