diff --git a/Gemfile.lock b/Gemfile.lock
index ecf9c9f..a99ffd2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -37,7 +37,8 @@ GEM
       ffi (~> 1.0)
     rbs (3.1.0)
     regexp_parser (2.7.0)
-    rexml (3.2.5)
+    rexml (3.3.6)
+      strscan
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)