diff --git a/Gemfile.lock b/Gemfile.lock
index a7808f4..44fc49e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,7 +22,8 @@ GEM
     rainbow (3.0.0)
     rake (13.0.3)
     regexp_parser (2.1.1)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rubocop (1.18.0)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
@@ -54,12 +55,14 @@ GEM
       aw (~> 0.1.6)
       defi (~> 1.1.5)
       matchi (~> 1.0.4)
+    strscan (3.1.0)
     unicode-display_width (2.0.0)
     yard (0.9.26)
 
 PLATFORMS
   x86_64-darwin-18
   x86_64-darwin-19
+  x86_64-linux
 
 DEPENDENCIES
   bundler