diff --git a/Gemfile.lock b/Gemfile.lock
index bb035bd7..c88251e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -690,7 +690,7 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
-    sdoc (2.3.0)
+    sdoc (2.3.1)
       rdoc (>= 5.0, < 6.4.0)
     shellany (0.0.1)
     shex (0.5.2)