diff --git a/docker/dockerfile b/docker/dockerfile
index f74f960..7086e08 100644
--- a/docker/dockerfile
+++ b/docker/dockerfile
@@ -10,7 +10,7 @@ RUN apk add \
 
 RUN python3 -m pip install --upgrade pip
 
-RUN python3 -m pip install slackclient
+RUN python3 -m pip install slackclient==2.0.0
 
 COPY ./ ./