diff --git a/Gemfile.lock b/Gemfile.lock
index 1c26a55d..a4ddaaae 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -376,7 +376,8 @@ GEM
       railties (>= 5.2)
     reverse_markdown (2.1.1)
       nokogiri
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rinku (2.0.6)
     rladr (1.2.0)
     rouge (4.1.2)
@@ -489,6 +490,7 @@ GEM
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
     stringio (3.1.0)
+    strscan (3.1.0)
     syntax_tree (6.1.1)
       prettier_print (>= 1.2.0)
     syntax_tree-haml (4.0.3)