diff --git a/Dockerfile b/Dockerfile
index b5238533a..afa1768c3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,9 @@
 FROM ruby:2.3.1-alpine
 
-RUN apk add -U alpine-sdk nodejs
+RUN apk add --update --no-cache \
+    alpine-sdk \
+    nodejs \
+    tzdata
 
 WORKDIR /app/
 
diff --git a/Gemfile b/Gemfile
index 67989399c..c45dca6b3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -21,8 +21,6 @@ gem 'sdoc', '~> 0.4.0', group: :doc
 # Used for 'respond_to' feature
 gem 'responders', '~> 2.0'
 
-gem 'tzinfo-data'
-
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug'