diff --git a/Gemfile.lock b/Gemfile.lock
index 370db1e..64f197c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -38,7 +38,8 @@ GEM
       concurrent-ruby (~> 1.0)
     multi_json (1.15.0)
     public_suffix (4.0.6)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rspec (3.10.0)
       rspec-core (~> 3.10.0)
       rspec-expectations (~> 3.10.0)
@@ -52,6 +53,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.10.0)
     rspec-support (3.10.2)
+    strscan (3.1.0)
     webmock (3.13.0)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)