diff --git a/Gemfile.lock b/Gemfile.lock
index efc9608..dcdde53 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,7 +28,8 @@ GEM
       ast (~> 2.4.1)
     rainbow (3.0.0)
     regexp_parser (1.8.2)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rspec (3.10.0)
       rspec-core (~> 3.10.0)
       rspec-expectations (~> 3.10.0)
@@ -57,6 +58,7 @@ GEM
       rubocop (~> 1.0)
       rubocop-ast (>= 1.1.0)
     ruby-progressbar (1.10.1)
+    strscan (3.1.0)
     thread_safe (0.3.6)
     tzinfo (1.2.10)
       thread_safe (~> 0.1)