diff --git a/docker/dockerfile b/docker/dockerfile
index e0c1819..f986350 100644
--- a/docker/dockerfile
+++ b/docker/dockerfile
@@ -14,7 +14,8 @@ RUN pip3 install --upgrade pip
 
 RUN pip3 install --upgrade setuptools
 
-RUN pip3 install slackclient==2.0.0
+RUN pip3 install slackclient==1.3.1
+RUN pip3 install requests six websocket
 
 COPY ./ ./