diff --git a/Gemfile.lock b/Gemfile.lock
index ec42f54..cc0b9be 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
     concurrent-ruby (1.1.5)
     em-websocket (0.5.1)
@@ -27,12 +27,10 @@ GEM
       pathutil (~> 0.9)
       rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-    jekyll-feed (0.12.1)
-      jekyll (>= 3.7, < 5.0)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
-    jekyll-seo-tag (2.6.0)
-      jekyll (~> 3.3)
+    jekyll-sitemap (1.4.0)
+      jekyll (>= 3.7, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
     kramdown (1.17.0)
@@ -42,13 +40,10 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
     mercenary (0.3.6)
-    minima (2.5.0)
-      jekyll (~> 3.5)
-      jekyll-feed (~> 0.9)
-      jekyll-seo-tag (~> 2.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (3.0.3)
+    public_suffix (4.0.6)
+    pygments.rb (2.2.0)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
       ffi (~> 1.0)
@@ -65,10 +60,9 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  jekyll (~> 3.8.5)
-  jekyll-feed (~> 0.6)
-  minima (~> 2.0)
-  tzinfo-data
+  jekyll (~> 3.1)
+  jekyll-sitemap
+  pygments.rb
 
 BUNDLED WITH
    1.17.2