diff --git a/Gemfile.lock b/Gemfile.lock
index b01f39e..34e49e3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -32,7 +32,8 @@ GEM
     rainbow (3.0.0)
     rake (13.0.3)
     regexp_parser (2.0.3)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rubocop (1.7.0)
       parallel (~> 1.10)
       parser (>= 2.7.1.5)
@@ -55,6 +56,8 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.3)
+    strscan (3.1.0)
+    strscan (3.1.0-java)
     unicode-display_width (1.7.0)
     wavefile (0.6.0)