diff --git a/datasciencecourse/Gemfile.lock b/datasciencecourse/Gemfile.lock
index 5d1b4e4..ca9860d 100644
--- a/datasciencecourse/Gemfile.lock
+++ b/datasciencecourse/Gemfile.lock
@@ -219,7 +219,7 @@ GEM
     ruby-enum (0.7.2)
       i18n
     ruby_dep (1.5.0)
-    rubyzip (1.2.3)
+    rubyzip (2.2.0)
     safe_yaml (1.0.5)
     sass (3.7.4)
       sass-listen (~> 4.0.0)