diff --git a/Gemfile.lock b/Gemfile.lock
index db3768e..ba10434 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -16,47 +16,49 @@ GEM
     http_parser.rb (0.8.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.8.7)
+    jekyll (3.9.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
       i18n (~> 0.7)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 2.0)
-      kramdown (~> 1.14)
+      kramdown (>= 1.17, < 3)
       liquid (~> 4.0)
       mercenary (~> 0.3.3)
       pathutil (~> 0.9)
       rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-    jekyll-feed (0.13.0)
+    jekyll-feed (0.15.1)
       jekyll (>= 3.7, < 5.0)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
-    jekyll-seo-tag (2.6.1)
-      jekyll (>= 3.3, < 5.0)
+    jekyll-seo-tag (2.7.1)
+      jekyll (>= 3.8, < 5.0)
     jekyll-tidy (0.2.2)
       htmlbeautifier
       htmlcompressor
       jekyll
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (1.17.0)
+    kramdown (2.3.1)
+      rexml
     liquid (4.0.3)
     listen (3.7.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    no-style-please (0.4.4)
-      jekyll (~> 3.8.7)
-      jekyll-feed (~> 0.13.0)
-      jekyll-seo-tag (~> 2.6.1)
+    no-style-please (0.4.7)
+      jekyll (~> 3.9.0)
+      jekyll-feed (~> 0.15.1)
+      jekyll-seo-tag (~> 2.7.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    rexml (3.2.5)
     rouge (3.27.0)
     safe_yaml (1.0.5)
     sass (3.7.4)
@@ -69,14 +71,8 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  jekyll (~> 3.8.7)
-  jekyll-feed (~> 0.13.0)
-  jekyll-seo-tag (~> 2.6.1)
   jekyll-tidy
   no-style-please
-  tzinfo (~> 1.2)
-  tzinfo-data
-  wdm (~> 0.1.1)
 
 BUNDLED WITH
    2.2.4