diff --git a/how-to-use-azureml/automated-machine-learning/automl_env.yml b/how-to-use-azureml/automated-machine-learning/automl_env.yml
index 6a90d446..755e7d56 100644
--- a/how-to-use-azureml/automated-machine-learning/automl_env.yml
+++ b/how-to-use-azureml/automated-machine-learning/automl_env.yml
@@ -8,7 +8,7 @@ dependencies:
   # Currently Azure ML only supports 3.6.0 and later.
 - pip==20.2.4
 - python>=3.6,<3.9
-- matplotlib==3.3.4
+- matplotlib==3.2.1
 - py-xgboost==1.3.3
 - pytorch::pytorch=1.4.0
 - conda-forge::fbprophet==0.7.1
diff --git a/how-to-use-azureml/automated-machine-learning/automl_env_linux.yml b/how-to-use-azureml/automated-machine-learning/automl_env_linux.yml
index 93cc3aa4..491beddb 100644
--- a/how-to-use-azureml/automated-machine-learning/automl_env_linux.yml
+++ b/how-to-use-azureml/automated-machine-learning/automl_env_linux.yml
@@ -10,7 +10,7 @@ dependencies:
 - python>=3.6,<3.9
 - boto3==1.20.19
 - botocore<=1.23.19
-- matplotlib==3.3.4
+- matplotlib==3.2.1
 - numpy==1.19.5
 - cython==0.29.14
 - urllib3==1.26.7
diff --git a/how-to-use-azureml/automated-machine-learning/automl_env_mac.yml b/how-to-use-azureml/automated-machine-learning/automl_env_mac.yml
index 48991355..f66a56e4 100644
--- a/how-to-use-azureml/automated-machine-learning/automl_env_mac.yml
+++ b/how-to-use-azureml/automated-machine-learning/automl_env_mac.yml
@@ -11,7 +11,7 @@ dependencies:
 - python>=3.6,<3.9
 - boto3==1.20.19
 - botocore<=1.23.19
-- matplotlib==3.3.4
+- matplotlib==3.2.1
 - numpy==1.19.5
 - cython==0.29.14
 - urllib3==1.26.7