diff --git a/Gemfile.lock b/Gemfile.lock
index 741476e..84fae36 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -53,7 +53,8 @@ GEM
       slop (~> 3.4)
     public_suffix (4.0.7)
     rake (13.0.1)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rspec (2.99.0)
       rspec-core (~> 2.99.0)
       rspec-expectations (~> 2.99.0)
@@ -64,6 +65,7 @@ GEM
     rspec-mocks (2.99.3)
     ruby2_keywords (0.0.5)
     slop (3.6.0)
+    strscan (3.1.0)
     webmock (3.14.0)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)