diff --git a/Gemfile b/Gemfile
index ea5fdcb..7792684 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,7 +15,7 @@ gem "minima", "~> 2.5", ">= 2.5.1"
 
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
-gem "github-pages", ">= 206", group: :jekyll_plugins
+gem "github-pages", ">= 207", group: :jekyll_plugins
 
 # If you have any plugins, put them here!
 #group :jekyll_plugins do
diff --git a/Gemfile.lock b/Gemfile.lock
index 4641d44..5928f01 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,8 +14,8 @@ GEM
     commonmarker (0.17.13)
       ruby-enum (~> 0.5)
     concurrent-ruby (1.1.6)
-    dnsruby (1.61.3)
-      addressable (~> 2.5)
+    dnsruby (1.61.4)
+      simpleidn (~> 0.1)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
@@ -30,9 +30,9 @@ GEM
     ffi (1.13.1-x64-mingw32)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
-    github-pages (206)
+    github-pages (207)
       github-pages-health-check (= 1.16.1)
-      jekyll (= 3.8.7)
+      jekyll (= 3.9.0)
       jekyll-avatar (= 0.7.0)
       jekyll-coffeescript (= 1.1.1)
       jekyll-commonmark-ghpages (= 0.1.6)
@@ -66,7 +66,8 @@ GEM
       jekyll-theme-time-machine (= 0.1.1)
       jekyll-titles-from-headings (= 0.5.3)
       jemoji (= 0.11.1)
-      kramdown (= 1.17.0)
+      kramdown (= 2.3.0)
+      kramdown-parser-gfm (= 1.1.0)
       liquid (= 4.0.3)
       mercenary (~> 0.3)
       minima (= 2.5.1)
@@ -85,14 +86,14 @@ GEM
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.8.7)
+    jekyll (3.9.0)
       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)
@@ -190,7 +191,10 @@ GEM
       gemoji (~> 3.0)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
-    kramdown (1.17.0)
+    kramdown (2.3.0)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
     liquid (4.0.3)
     listen (3.2.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
@@ -216,6 +220,7 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    rexml (3.2.4)
     rouge (3.19.0)
     ruby-enum (0.8.0)
       i18n
@@ -229,6 +234,8 @@ GEM
     sawyer (0.8.2)
       addressable (>= 2.3.5)
       faraday (> 0.8, < 2.0)
+    simpleidn (0.1.1)
+      unf (~> 0.1.4)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     typhoeus (1.4.0)
@@ -237,6 +244,10 @@ GEM
       concurrent-ruby (~> 1.0)
     tzinfo-data (1.2020.1)
       tzinfo (>= 1.0.0)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.7.7)
+    unf_ext (0.0.7.7-x64-mingw32)
     unicode-display_width (1.7.0)
 
 PLATFORMS
@@ -244,7 +255,7 @@ PLATFORMS
   x64-mingw32
 
 DEPENDENCIES
-  github-pages (>= 206)
+  github-pages (>= 207)
   minima (~> 2.5, >= 2.5.1)
   tzinfo-data