diff --git a/Gemfile.lock b/Gemfile.lock
index 031ed44..cf42b9a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,8 +27,8 @@ GEM
     rainbow (3.1.1)
     rake (12.3.3)
     regexp_parser (2.9.2)
-    rexml (3.2.8)
-      strscan (>= 3.0.9)
+    rexml (3.3.3)
+      strscan
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
       rspec-expectations (~> 3.8.0)