diff --git a/Gemfile.lock b/Gemfile.lock
index ca4c3f8..306e3fc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -32,7 +32,8 @@ GEM
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
       rspec-expectations (~> 3.8.0)
@@ -60,6 +61,7 @@ GEM
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
+    strscan (3.1.0)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8)