diff --git a/notebooks/requirements.txt b/notebooks/requirements.txt
index 64d7db8b8ad..f4e3c81e1a4 100644
--- a/notebooks/requirements.txt
+++ b/notebooks/requirements.txt
@@ -1,4 +1,5 @@
 google-cloud-storage==1.43.0
 google-cloud-bigquery[pandas,pyarrow]==2.31.0
-matplotlib==3.1.2; python_version > '3.0'
+matplotlib==3.5.1; python_version > '3.6'
+matplotlib==3.3.4; python_version == '3.6'
 matplotlib==2.2.5; python_version < '3.0'