diff --git a/Gemfile.lock b/Gemfile.lock
index cb1e4cb..a60305f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -52,7 +52,8 @@ GEM
     rainbow (3.1.1)
     rake (13.0.1)
     regexp_parser (2.9.0)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)
       rspec-expectations (~> 3.5.0)
@@ -96,6 +97,7 @@ GEM
     simplecov-html (0.10.2)
     sqlite3 (1.7.0)
       mini_portile2 (~> 2.8.0)
+    strscan (3.1.0)
     sync (0.5.0)
     term-ansicolor (1.7.1)
       tins (~> 1.0)