diff --git a/doc/source/conf.py b/doc/source/conf.py
index 6accfe56b..4c8bf3d20 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -32,7 +32,6 @@ MOCK_MODULES = ["gym",
                 "tensorflow.python",
                 "tensorflow.python.client",
                 "tensorflow.python.util",
-                "smart_open",
                 "ray.local_scheduler",
                 "ray.plasma",
                 "ray.core.generated.TaskInfo",
diff --git a/docker/examples/Dockerfile b/docker/examples/Dockerfile
index 72a4314da..382da881b 100644
--- a/docker/examples/Dockerfile
+++ b/docker/examples/Dockerfile
@@ -3,6 +3,6 @@
 FROM ray-project/deploy
 RUN conda install -y -c conda-forge tensorflow
 RUN apt-get install -y zlib1g-dev
-RUN pip install gym[atari] opencv-python==3.2.0.8 smart_open
+RUN pip install gym[atari] opencv-python==3.2.0.8
 RUN pip install --upgrade git+git://github.com/hyperopt/hyperopt.git
 # RUN conda install -y -q pytorch torchvision -c soumith