diff --git a/Gemfile.lock b/Gemfile.lock
index 74202be..b246a21 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,8 +10,10 @@ GEM
     power_assert (1.1.6)
     public_suffix (4.0.6)
     rake (13.0.1)
-    rexml (3.2.5)
+    rexml (3.3.2)
+      strscan
     safe_yaml (1.0.5)
+    strscan (3.1.0)
     test-unit (3.3.5)
       power_assert
     webmock (3.8.2)