diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 3a3b0c6..b3143db 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     colorator (1.1.0)
     concurrent-ruby (1.0.5)
     em-websocket (0.5.1)
@@ -29,8 +29,6 @@ GEM
       safe_yaml (~> 1.0)
     jekyll-feed (0.11.0)
       jekyll (~> 3.3)
-    jekyll-menus (0.6.0)
-      jekyll (~> 3.1)
     jekyll-redirect-from (0.14.0)
       jekyll (~> 3.3)
     jekyll-sass-converter (1.5.2)
@@ -52,7 +50,7 @@ GEM
       jekyll-seo-tag (~> 2.1)
     pathutil (0.16.1)
       forwardable-extended (~> 2.6)
-    public_suffix (3.0.3)
+    public_suffix (5.0.0)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
@@ -71,7 +69,6 @@ PLATFORMS
 DEPENDENCIES
   jekyll (~> 3.8.3)
   jekyll-feed (~> 0.6)
-  jekyll-menus
   jekyll-redirect-from
   minima (~> 2.0)
   tzinfo-data