diff --git a/Gemfile.lock b/Gemfile.lock
index 34ad2aa..d561b04 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -36,7 +36,8 @@ GEM
     rake (13.0.6)
     rdoc (6.3.2)
     regexp_parser (2.1.1)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rubocop (1.20.0)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
@@ -56,6 +57,7 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.3)
+    strscan (3.1.0)
     terminal-table (3.0.1)
       unicode-display_width (>= 1.1.1, < 3)
     timecop (0.9.4)