diff --git a/Gemfile b/Gemfile
index 7f25aa46..22dc5f6e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -200,6 +200,11 @@ gem 'sprockets-rails'
 # for multiple speakers select on proposal/event forms
 gem 'selectize-rails'
 
+# Nokogiri < 1.8.1 is subject to:
+# CVE-2017-0663, CVE-2017-7375, CVE-2017-7376, CVE-2017-9047, CVE-2017-9048,
+# CVE-2017-9049, CVE-2017-9050
+gem 'nokogiri', '>= 1.8.1'
+
 # Use guard and spring for testing in development
 group :development do
   # to launch specs when files are modified
diff --git a/Gemfile.lock b/Gemfile.lock
index c6b4faa8..c140ffdf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -290,7 +290,7 @@ GEM
     mysql2 (0.4.9)
     nenv (0.3.0)
     netrc (0.11.0)
-    nokogiri (1.8.0)
+    nokogiri (1.8.1)
       mini_portile2 (~> 2.2.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
diff --git a/app/views/conferences/_venue.html.haml b/app/views/conferences/_venue.html.haml
index 62af90c7..5aee70af 100644
--- a/app/views/conferences/_venue.html.haml
+++ b/app/views/conferences/_venue.html.haml
@@ -32,4 +32,4 @@
           = @conference.venue.country_name
           - if @conference.venue.website
             %br
-            =link_to @conference.venue.website, @conference.venue.website
+            = sanitize link_to(@conference.venue.website, @conference.venue.website)
diff --git a/app/views/conferences/_venue_map.html.haml b/app/views/conferences/_venue_map.html.haml
index b58b3053..b4326924 100644
--- a/app/views/conferences/_venue_map.html.haml
+++ b/app/views/conferences/_venue_map.html.haml
@@ -3,14 +3,14 @@
 - content_for(:script_body) do
   :javascript
     // create a map in the "map" div, set the view to a given place and zoom
-    var map = L.map('map', { scrollWheelZoom: false }).setView([#{@conference.venue.latitude}, #{@conference.venue.longitude}], 11);
+    var map = L.map('map', { scrollWheelZoom: false }).setView([#{sanitize @conference.venue.latitude}, #{sanitize @conference.venue.longitude}], 11);
     // add an OpenStreetMap tile layer
     L.tileLayer('//{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
       attribution: 'Map data &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="http://mapbox.com">Mapbox</a>',
       maxZoom: 18
     }).addTo(map);
     // add a marker in the given location, attach some popup content to it and open the popup
-    L.marker([#{@conference.venue.latitude}, #{@conference.venue.longitude}]).addTo(map)
+    L.marker([#{sanitize @conference.venue.latitude}, #{sanitize @conference.venue.longitude}]).addTo(map)
       .bindPopup("#{popup}")
       .openPopup();
     // Turn scrollwheel on when user clicks
diff --git a/app/views/conferences/show.html.haml b/app/views/conferences/show.html.haml
index f94b8ee4..5022a7a1 100644
--- a/app/views/conferences/show.html.haml
+++ b/app/views/conferences/show.html.haml
@@ -82,7 +82,7 @@
 
 - content_for :script_head do
   :javascript
-    var triangle_tcs = tinycolor("#{@conference.color}").monochromatic();
+    var triangle_tcs = tinycolor("#{sanitize @conference.color}").monochromatic();
     var triangle_colors = triangle_tcs.map(function(t) { return t.toHexString(); });
     $(function () {
       $(document).ready(function() {