Update nokogiri
diff --git a/Gemfile b/Gemfile
index 066fc72..da0b779 100644
--- a/Gemfile
+++ b/Gemfile
@@ -67,6 +67,9 @@
 # Loads environment variables from `.env`
 gem 'dotenv-rails'
 
+# Force newer nokogiri for security fixes
+gem 'nokogiri', '~> 1.8.1'
+
 group :development, :test do
   # More useful error page
   gem 'better_errors'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1c5969f..cb4c664 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,5 +1,5 @@
 GIT
-  remote: git://github.com/myExperiment/workflow_parser-t2flow.git
+  remote: https://github.com/myExperiment/workflow_parser-t2flow.git
   revision: 21654f2e9c7f20281e5ed063b334870349228819
   specs:
     taverna-t2flow (0.6.0.pre.SNAPSHOT)
@@ -8,7 +8,7 @@
       workflow_parser (~> 0.0)
 
 GIT
-  remote: git://github.com/myExperiment/workflow_parser.git
+  remote: https://github.com/myExperiment/workflow_parser.git
   revision: a1b1478641e70c04397be133145e5039a98e6dd4
   specs:
     workflow_parser (0.0.1)