diff --git a/Gemfile.lock b/Gemfile.lock
index a4e0de22bc4..a8cdb563862 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -75,7 +75,7 @@ GEM
       safe_yaml (~> 1.0.0)
     crass (1.0.2)
     debug_inspector (0.0.2)
-    diff-lcs (1.2.5)
+    diff-lcs (1.3)
     discourse-qunit-rails (0.0.9)
       railties
     discourse_fastimage (2.0.3)