diff --git a/Gemfile.lock b/Gemfile.lock
index 563508abfb7..2d629a240d3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -103,8 +103,8 @@ GEM
     jekyll-watch (2.2.1)
       listen (~> 3.0)
     json (2.8.2)
-    kramdown (2.4.0)
-      rexml
+    kramdown (2.5.1)
+      rexml (>= 3.3.9)
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.4)