diff --git a/Gemfile.lock b/Gemfile.lock
index 9b3cd52..1b9f28c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -61,7 +61,7 @@ GEM
     rack-test (2.0.2)
       rack (>= 1.3)
     rake (13.0.1)
-    rexml (3.2.5)
+    rexml (3.3.9)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)