diff --git a/Gemfile.lock b/Gemfile.lock
index 1494cfe..bd3be5b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,7 +43,8 @@ GEM
     multipart-post (2.1.1)
     public_suffix (4.0.6)
     rake (13.0.6)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)
@@ -58,6 +59,7 @@ GEM
       rspec-support (~> 3.11.0)
     rspec-support (3.11.0)
     ruby2_keywords (0.0.5)
+    strscan (3.1.0)
     webmock (3.14.0)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)