diff --git a/Gemfile.lock b/Gemfile.lock
index 70bce5b..269b8ef 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -21,7 +21,8 @@ GEM
     rake (13.0.6)
     rdoc (6.4.0)
       psych (>= 4.0.0)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     simplecov (0.21.2)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
@@ -29,6 +30,7 @@ GEM
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
     stringio (3.0.1)
+    strscan (3.1.0)
     test-unit (3.5.3)
       power_assert
     vcr (3.0.3)