diff --git a/Gemfile.lock b/Gemfile.lock
index 1bce9e1..6954398 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -99,7 +99,8 @@ GEM
     mini_mime (1.1.5)
     multi_xml (0.6.0)
     public_suffix (5.0.4)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -114,6 +115,7 @@ GEM
       rspec-support (~> 3.12.0)
     rspec-support (3.12.1)
     ruby2_keywords (0.0.5)
+    strscan (3.1.0)
     webmock (3.19.1)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)