diff --git a/Dockerfile.ruby-2.3-static-analyses b/Dockerfile.ruby-2.3-static-analyses
index e110287..f7a43c5 100644
--- a/Dockerfile.ruby-2.3-static-analyses
+++ b/Dockerfile.ruby-2.3-static-analyses
@@ -1,3 +1,4 @@
 FROM ruby:2.3-alpine
 
 RUN gem install knapsack
+RUN apk add --update bash && rm -rf /var/cache/apk/*
\ No newline at end of file