diff --git a/Gemfile.lock b/Gemfile.lock
index c7acd91..4648b3c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -65,7 +65,8 @@ GEM
     rainbow (3.1.1)
     rake (12.3.3)
     regexp_parser (2.6.2)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rouge (3.30.0)
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
@@ -94,6 +95,7 @@ GEM
       parser (>= 3.1.1.0)
     ruby-progressbar (1.11.0)
     ruby-rc4 (0.1.5)
+    strscan (3.1.0)
     thread_safe (0.3.6)
     treetop (1.6.12)
       polyglot (~> 0.3)