diff --git a/Gemfile b/Gemfile
index 0329ec07..34ffb8b7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'highline'
 gem 'jbuilder'
 gem 'jquery-rails'
 gem 'jquery-turbolinks'
-gem 'ims-lti', '1.1.10' # version 1.1.13 will crash, because @provider.valid_request?(request) on lti.rb line 89 will return false.
+gem 'ims-lti', '< 2.0.0'
 gem 'kramdown'
 gem 'newrelic_rpm'
 gem 'pg', '< 1.0', platform: :ruby
@@ -22,7 +22,7 @@ gem 'rails', '4.2.10'
 gem 'rails-i18n'
 gem 'ransack'
 gem 'rubytree'
-gem 'sass-rails', '>= 5.0.7'
+gem 'sass-rails'
 gem 'slim-rails'
 gem 'bootstrap_pagedown'
 gem 'sorcery'
@@ -35,7 +35,7 @@ gem 'nokogiri'
 gem 'd3-rails', '~>4.0'
 gem 'rest-client'
 gem 'rubyzip'
-gem 'mnemosyne-ruby', '~> 1.0'
+gem 'mnemosyne-ruby'
 gem 'whenever', require: false
 
 group :development, :staging do
@@ -59,7 +59,7 @@ end
 group :test do
   gem 'autotest-rails'
   gem 'capybara'
-  gem 'capybara-selenium', '>= 0.0.6'
+  gem 'selenium-webdriver'
   gem 'headless'
   gem 'codeclimate-test-reporter', require: false
   gem 'database_cleaner'
diff --git a/Gemfile.lock b/Gemfile.lock
index b5219e5d..26f12f09 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -87,9 +87,6 @@ GEM
       rack (>= 1.6.0)
       rack-test (>= 0.6.3)
       xpath (~> 3.1)
-    capybara-selenium (0.0.6)
-      capybara
-      selenium-webdriver
     carrierwave (1.2.3)
       activemodel (>= 4.0.0)
       activesupport (>= 4.0.0)
@@ -145,9 +142,9 @@ GEM
       domain_name (~> 0.5)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    ims-lti (1.1.10)
+    ims-lti (1.2.2)
       builder
-      oauth (~> 0.4.5)
+      oauth (>= 0.4.5, < 0.6)
     jaro_winkler (1.5.1)
     jbuilder (2.7.0)
       activesupport (>= 4.2.0)
@@ -189,7 +186,7 @@ GEM
       mini_portile2 (~> 2.3.0)
     nyan-cat-formatter (0.12.0)
       rspec (>= 2.99, >= 2.14.2, < 4)
-    oauth (0.4.7)
+    oauth (0.5.4)
     oauth2 (1.4.0)
       faraday (>= 0.8, < 0.13)
       jwt (~> 1.0)
@@ -385,7 +382,6 @@ DEPENDENCIES
   capistrano-upload-config
   capistrano3-puma
   capybara
-  capybara-selenium (>= 0.0.6)
   carrierwave
   codeclimate-test-reporter
   concurrent-ruby
@@ -398,12 +394,12 @@ DEPENDENCIES
   forgery
   headless
   highline
-  ims-lti (= 1.1.10)
+  ims-lti (< 2.0.0)
   jbuilder
   jquery-rails
   jquery-turbolinks
   kramdown
-  mnemosyne-ruby (~> 1.0)
+  mnemosyne-ruby
   newrelic_rpm
   nokogiri
   nyan-cat-formatter
@@ -422,7 +418,8 @@ DEPENDENCIES
   rubocop-rspec
   rubytree
   rubyzip
-  sass-rails (>= 5.0.7)
+  sass-rails
+  selenium-webdriver
   simplecov
   slim-rails
   sorcery