diff --git a/ci/cibuild b/.ci/build.sh
old mode 100644
new mode 100755
similarity index 71%
rename from ci/cibuild
rename to .ci/build.sh
index e119597c..820be72f
--- a/ci/cibuild
+++ b/.ci/build.sh
@@ -1,7 +1,8 @@
 #!/usr/bin/env bash
 set -e # halt script on error
 
-bundle exec jekyll build
+bundle exec jekyll build --strict_front_matter
+
 bundle exec htmlproofer ./_site \
 	--disable-external \
 	--only-4xx
diff --git a/Gemfile b/Gemfile
index 75feaf52..d934e539 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
 source "https://rubygems.org"
 
-gem "jekyll"
+gem "jekyll", '>=3.5.0'
 gem "html-proofer"
diff --git a/Gemfile.lock b/Gemfile.lock
index 4e354a62..2a93ac99 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,65 +1,63 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.1.2)
+    activesupport (5.1.4)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.1)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
     colorator (1.1.0)
-    colored (1.2)
+    colorize (0.8.1)
     concurrent-ruby (1.0.5)
-    ethon (0.10.1)
+    ethon (0.11.0)
       ffi (>= 1.3.0)
     ffi (1.9.18)
     forwardable-extended (2.6.0)
-    html-proofer (3.7.2)
+    html-proofer (3.7.4)
       activesupport (>= 4.2, < 6.0)
       addressable (~> 2.3)
-      colored (~> 1.2)
+      colorize (~> 0.8)
       mercenary (~> 0.3.2)
       nokogiri (~> 1.7)
       parallel (~> 1.3)
       typhoeus (~> 0.7)
       yell (~> 2.0)
-    i18n (0.8.6)
-    jekyll (3.5.1)
+    i18n (0.9.0)
+      concurrent-ruby (~> 1.0)
+    jekyll (3.6.2)
       addressable (~> 2.4)
       colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
+      kramdown (~> 1.14)
       liquid (~> 4.0)
       mercenary (~> 0.3.3)
       pathutil (~> 0.9)
-      rouge (~> 1.7)
+      rouge (>= 1.7, < 3)
       safe_yaml (~> 1.0)
     jekyll-sass-converter (1.5.0)
       sass (~> 3.4)
     jekyll-watch (1.5.0)
-      listen (~> 3.0, < 3.1)
-    kramdown (1.14.0)
+      listen (~> 3.0)
+    kramdown (1.15.0)
     liquid (4.0.0)
-    listen (3.0.8)
-      rb-fsevent (~> 0.9, >= 0.9.4)
+    listen (3.1.5)
       rb-inotify (~> 0.9, >= 0.9.7)
     mercenary (0.3.6)
-    mini_portile2 (2.2.0)
-    minitest (5.10.2)
-    nokogiri (1.8.0)
-      mini_portile2 (~> 2.2.0)
-    parallel (1.11.2)
-    pathutil (0.14.0)
+    minitest (5.10.3)
+    nokogiri (1.8.1)
+    parallel (1.12.0)
+    pathutil (0.16.0)
       forwardable-extended (~> 2.6)
-    public_suffix (2.0.5)
+    public_suffix (3.0.0)
     rb-fsevent (0.10.2)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
-    rouge (1.11.1)
+    rouge (2.2.1)
     safe_yaml (1.0.4)
-    sass (3.5.1)
+    sass (3.5.3)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -67,7 +65,7 @@ GEM
     thread_safe (0.3.6)
     typhoeus (0.8.0)
       ethon (>= 0.8.0)
-    tzinfo (1.2.3)
+    tzinfo (1.2.4)
       thread_safe (~> 0.1)
     yell (2.0.7)
 
@@ -76,7 +74,7 @@ PLATFORMS
 
 DEPENDENCIES
   html-proofer
-  jekyll
+  jekyll (>= 3.5.0)
 
 BUNDLED WITH
-   1.14.3
+   1.13.7