diff --git a/Gemfile.lock b/Gemfile.lock
index 8fc1489..c2d6424 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,7 +46,8 @@ GEM
     rake (13.0.6)
     rbtree (0.4.6)
     regexp_parser (2.5.0)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rspec (3.10.0)
       rspec-core (~> 3.10.0)
       rspec-expectations (~> 3.10.0)
@@ -79,6 +80,7 @@ GEM
     sorted_set (1.0.3)
       rbtree
       set (~> 1.0)
+    strscan (3.1.0)
     unicode-display_width (2.1.0)
     zlib (1.1.0)