diff --git a/Dockerfile b/Dockerfile
index 5da6893..7c7c87b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,4 +4,6 @@ WORKDIR /code
 COPY . /code
 RUN bundle install
 
-CMD ["bundle", "exec", "rackup", "--host", "0.0.0.0", "-p", "4567"]
\ No newline at end of file
+CMD ["bundle", "exec", "rackup", "--host", "0.0.0.0", "-p", "4567"]
+
+EXPOSE 4567
\ No newline at end of file