diff --git a/Gemfile.lock b/Gemfile.lock
index 9096c1a..9221f5e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -80,7 +80,8 @@ GEM
     rake (13.0.3)
     regexp_parser (2.8.2)
     retriable (3.1.2)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
       rspec-expectations (~> 3.8.0)
@@ -121,6 +122,7 @@ GEM
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
+    strscan (3.1.0)
     sync (0.5.0)
     term-ansicolor (1.7.1)
       tins (~> 1.0)