diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 84bb665..5203539 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -1,20 +1,20 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.7.0)
+    addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.8)
+    concurrent-ruby (1.1.9)
     em-websocket (0.5.2)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
-    ffi (1.14.2)
+    ffi (1.15.3)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.9.0)
+    jekyll (3.9.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -38,20 +38,20 @@ GEM
       jekyll-seo-tag (~> 2.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (2.3.0)
+    kramdown (2.3.1)
       rexml
     liquid (4.0.3)
-    listen (3.4.1)
+    listen (3.5.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
-    rb-fsevent (0.10.4)
+    rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.4)
+    rexml (3.2.5)
     rouge (3.26.0)
     safe_yaml (1.0.5)
     sass (3.7.4)
@@ -71,7 +71,7 @@ PLATFORMS
 
 DEPENDENCIES
   jekyll (~> 3.9.0)
-  jekyll-feed (~> 0.13, >= 0.13.0)
+  jekyll-feed (~> 0.15, >= 0.15.1)
   jekyll-theme-slate (~> 0.1.1)
   tzinfo (~> 1.2)
   tzinfo-data