diff --git a/Gemfile.lock b/Gemfile.lock
index a9d488f..61f5992 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,8 +6,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
@@ -68,12 +68,12 @@ GEM
       jekyll-titles-from-headings (= 0.5.1)
       jemoji (= 0.10.2)
       kramdown (= 1.17.0)
-      liquid (= 4.0.1)
+      liquid (= 4.0.0)
       listen (= 3.1.5)
       mercenary (~> 0.3)
       minima (= 2.5.0)
       nokogiri (>= 1.8.5, < 2.0)
-      rouge (= 3.3.0)
+      rouge (= 2.2.1)
       terminal-table (~> 1.4)
     github-pages-health-check (1.16.1)
       addressable (~> 2.3)
@@ -192,7 +192,7 @@ GEM
       html-pipeline (~> 2.2)
       jekyll (~> 3.0)
     kramdown (1.17.0)
-    liquid (4.0.1)
+    liquid (4.0.0)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -215,7 +215,7 @@ GEM
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
       ffi (~> 1.0)
-    rouge (3.3.0)
+    rouge (2.2.1)
     ruby-enum (0.7.2)
       i18n
     ruby_dep (1.5.0)