diff --git a/Gemfile.lock b/Gemfile.lock
index de7dd8b7..5e6ba671 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,7 +39,8 @@ GEM
     rake (13.0.6)
     rdoc (6.3.4.1)
     redcarpet (3.6.0)
-    rexml (3.2.6)
+    rexml (3.3.3)
+      strscan
     rouge (4.2.0)
     safe_yaml (1.0.5)
     strings (0.2.1)
@@ -47,6 +48,7 @@ GEM
       unicode-display_width (>= 1.5, < 3.0)
       unicode_utils (~> 1.4)
     strings-ansi (0.2.0)
+    strscan (3.1.0)
     temple (0.10.3)
     test-unit (3.4.9)
       power_assert