diff --git a/guides/Gemfile b/guides/Gemfile
index e68abc2eca0..d5038073071 100644
--- a/guides/Gemfile
+++ b/guides/Gemfile
@@ -4,9 +4,9 @@ gem 'builder'
 gem 'coderay_bash'
 gem 'kramdown'
 gem 'mime-types'
-gem 'nokogiri'
+gem 'nokogiri', '>= 1.8.3'
 gem 'nanoc', '3.6.3'
-gem 'nanoc-toolbox'
+gem 'nanoc-toolbox', '>= 0.2.0'
 gem 'rake'
 gem 'thin'
 gem "yajl-ruby"
diff --git a/guides/Gemfile.lock b/guides/Gemfile.lock
index 7c8116048d4..733167f4a01 100644
--- a/guides/Gemfile.lock
+++ b/guides/Gemfile.lock
@@ -12,9 +12,7 @@ GEM
     coderay (1.1.0)
     coderay_bash (1.0.7)
       coderay (>= 1.0)
-    colored (1.2)
-    cri (2.6.1)
-      colored (~> 1.2)
+    cri (2.15.9)
     daemons (1.1.9)
     diff-lcs (1.2.5)
     eventmachine (1.0.7)
@@ -29,7 +27,7 @@ GEM
       rb-inotify (>= 0.9)
     method_source (0.8.2)
     mime-types (2.4.3)
-    mini_portile (0.6.2)
+    mini_portile2 (2.4.0)
     nanoc (3.6.3)
       cri (~> 2.3)
     nanoc-toolbox (0.2.0)
@@ -39,8 +37,8 @@ GEM
     neat (1.7.1)
       bourbon (>= 4.0)
       sass (>= 3.3)
-    nokogiri (1.6.6.2)
-      mini_portile (~> 0.6.0)
+    nokogiri (1.10.4)
+      mini_portile2 (~> 2.4.0)
     pry (0.10.1)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
@@ -87,9 +85,9 @@ DEPENDENCIES
   listen
   mime-types
   nanoc (= 3.6.3)
-  nanoc-toolbox
+  nanoc-toolbox (>= 0.2.0)
   neat
-  nokogiri
+  nokogiri (>= 1.8.3)
   pry
   rake
   rb-fsevent
@@ -97,3 +95,6 @@ DEPENDENCIES
   sass
   thin
   yajl-ruby
+
+BUNDLED WITH
+   1.17.3