diff --git a/Gemfile b/Gemfile
index 7e604be5..e6b3942f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,16 +9,16 @@ gem "image_optim_bin" # Optional
 gem "image_optim_pack"
 gem "image_optim"
 gem "jekyll-assets"
-gem "jekyll-feed"
+gem "jekyll-feed", ">= 0.15.1"
 gem "jekyll-gist"
 gem "jekyll-last-modified-at"
 gem "jekyll-paginate-v2"
 gem "jekyll-redirect-from"
-gem "jekyll-seo-tag"
+gem "jekyll-seo-tag", ">= 2.7.0"
 gem "jekyll-seo"
 gem "jekyll-sitemap"
-gem "jekyll"
-gem "jemoji"
+gem "jekyll", ">= 3.9.1"
+gem "jemoji", ">= 0.13.0"
 gem "kramdown-parser-gfm"
 gem "mini_magick"
 gem "rake"
diff --git a/Gemfile.lock b/Gemfile.lock
index 8193ca12..3b7fced6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,13 +1,13 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.2.4.3)
+    activesupport (5.2.8.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.6)
+      public_suffix (>= 2.0.2, < 6.0)
     amp-jekyll (1.0.3)
       fastimage (>= 1.8.0)
       jekyll (>= 3.0, < 5.0)
@@ -15,11 +15,11 @@ GEM
     autoprefixer-rails (9.8.6.1)
       execjs
     colorator (1.1.0)
-    concurrent-ruby (1.1.7)
+    concurrent-ruby (1.2.3)
     crass (1.0.6)
-    em-websocket (0.5.1)
+    em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0.6.0)
+      http_parser.rb (~> 0)
     ethon (0.12.0)
       ffi (>= 1.3.0)
     eventmachine (1.2.7)
@@ -30,13 +30,13 @@ GEM
     faraday (1.0.1)
       multipart-post (>= 1.2, < 3)
     fastimage (2.2.0)
-    ffi (1.13.1)
+    ffi (1.16.3)
     font-awesome-sass (5.13.0)
       sassc (>= 1.11)
     forwardable-extended (2.6.0)
     fspath (3.1.2)
-    gemoji (3.0.1)
-    html-pipeline (2.14.0)
+    gemoji (4.1.0)
+    html-pipeline (2.14.3)
       activesupport (>= 2)
       nokogiri (>= 1.4)
     html-proofer (3.15.3)
@@ -47,8 +47,8 @@ GEM
       rainbow (~> 3.0)
       typhoeus (~> 1.3)
       yell (~> 2.0)
-    http_parser.rb (0.6.0)
-    i18n (0.9.5)
+    http_parser.rb (0.8.0)
+    i18n (1.14.5)
       concurrent-ruby (~> 1.0)
     image_optim (0.26.5)
       exifr (~> 1.2, >= 1.2.2)
@@ -62,11 +62,11 @@ GEM
       image_optim (~> 0.19)
     image_size (2.1.0)
     in_threads (1.5.4)
-    jekyll (3.9.0)
+    jekyll (3.9.5)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 0.7)
+      i18n (>= 0.7, < 2)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 2.0)
       kramdown (>= 1.17, < 3)
@@ -86,7 +86,7 @@ GEM
       nokogiri (~> 1.8)
       pathutil (~> 0.16)
       sprockets (>= 3.3, < 4.1.beta)
-    jekyll-feed (0.15.0)
+    jekyll-feed (0.17.0)
       jekyll (>= 3.7, < 5.0)
     jekyll-gist (1.5.0)
       octokit (~> 4.2)
@@ -103,34 +103,35 @@ GEM
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
     jekyll-seo (0.0.2)
-    jekyll-seo-tag (2.6.1)
-      jekyll (>= 3.3, < 5.0)
+    jekyll-seo-tag (2.8.0)
+      jekyll (>= 3.8, < 5.0)
     jekyll-sitemap (1.4.0)
       jekyll (>= 3.7, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    jemoji (0.12.0)
-      gemoji (~> 3.0)
+    jemoji (0.13.0)
+      gemoji (>= 3, < 5)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
-    kramdown (2.3.0)
+    kramdown (2.4.0)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    liquid (4.0.3)
+    liquid (4.0.4)
     liquid-tag-parser (1.9.0)
       extras (~> 0.3)
       liquid (>= 3.0, < 5.0)
-    listen (3.2.1)
+    listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
     mini_magick (4.10.1)
-    mini_portile2 (2.4.0)
-    minitest (5.14.1)
+    mini_portile2 (2.8.6)
+    minitest (5.23.0)
     multipart-post (2.1.1)
-    nokogiri (1.10.10)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.15.6)
+      mini_portile2 (~> 2.8.2)
+      racc (~> 1.4)
     nokogumbo (2.0.2)
       nokogiri (~> 1.8, >= 1.8.4)
     octokit (4.18.0)
@@ -141,15 +142,17 @@ GEM
       forwardable-extended (~> 2.6)
     posix-spawn (0.3.15)
     progress (3.5.2)
-    public_suffix (4.0.5)
+    public_suffix (5.0.5)
+    racc (1.7.3)
     rack (2.2.3)
     rainbow (3.0.0)
     rake (13.0.1)
-    rb-fsevent (0.10.4)
+    rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.4)
-    rouge (3.22.0)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
+    rouge (3.30.0)
     safe_yaml (1.0.5)
     sanitize (5.2.1)
       crass (~> 1.0.2)
@@ -168,10 +171,11 @@ GEM
     sprockets (4.0.0.beta8)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
+    strscan (3.1.0)
     thread_safe (0.3.6)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
-    tzinfo (1.2.7)
+    tzinfo (1.2.11)
       thread_safe (~> 0.1)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
@@ -189,17 +193,17 @@ DEPENDENCIES
   image_optim
   image_optim_bin
   image_optim_pack
-  jekyll
+  jekyll (>= 3.9.1)
   jekyll-assets
-  jekyll-feed
+  jekyll-feed (>= 0.15.1)
   jekyll-gist
   jekyll-last-modified-at
   jekyll-paginate-v2
   jekyll-redirect-from
   jekyll-seo
-  jekyll-seo-tag
+  jekyll-seo-tag (>= 2.7.0)
   jekyll-sitemap
-  jemoji
+  jemoji (>= 0.13.0)
   kramdown-parser-gfm
   mini_magick
   rake