diff --git a/Gemfile b/Gemfile
index cc21c703..dfc4fa69 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'activesupport', '~> 3.0'
+gem 'activesupport', '~> 3.1'
 # see https://github.com/ncbo/ontologies_api/issues/69
 gem 'bigdecimal', '1.4.2'
 gem 'faraday', '~> 1.9'
@@ -18,7 +18,7 @@ gem 'sinatra-contrib', '~> 1.0'
 gem 'ffi'
 gem 'rack-accept', '~> 0.4'
 gem 'rack-attack', '~> 6.6.1', require: 'rack/attack'
-gem 'rack-cache', '~> 1.0'
+gem 'rack-cache', '~> 1.13.0'
 gem 'rack-cors', require: 'rack/cors'
 # GitHub dependency can be removed when https://github.com/niko/rack-post-body-to-params/pull/6 is merged and released
 gem 'rack-post-body-to-params', github: 'palexander/rack-post-body-to-params', branch: 'multipart_support'
@@ -26,8 +26,9 @@ gem 'rack-timeout'
 gem 'redis-rack-cache', '~> 2.0'
 
 # Data access (caching)
-gem 'redis'
+gem 'redis', '~> 4.8.1'
 gem 'redis-activesupport'
+gem 'redis-store', '1.9.1'
 
 # Monitoring
 gem 'cube-ruby', require: 'cube'
@@ -71,4 +72,5 @@ group :test do
   gem 'rack-test'
   gem 'simplecov', require: false
   gem 'simplecov-cobertura' # for codecov.io
-end
+  gem 'webmock'
+end
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index e2ea3509..c7cde714 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -126,7 +126,8 @@ GEM
       sshkit (~> 1.3)
     coderay (1.1.3)
     concurrent-ruby (1.2.2)
-    connection_pool (2.4.1)
+    crack (0.4.5)
+      rexml
     cube-ruby (0.0.3)
     dante (0.2.0)
     date (3.3.3)
@@ -181,6 +182,7 @@ GEM
     haml (5.2.2)
       temple (>= 0.8.0)
       tilt
+    hashdiff (1.0.1)
     http-accept (1.7.0)
     http-cookie (1.0.5)
       domain_name (~> 0.5)
@@ -244,7 +246,7 @@ GEM
       rack (>= 0.4)
     rack-attack (6.6.1)
       rack (>= 1.0, < 3)
-    rack-cache (1.14.0)
+    rack-cache (1.13.0)
       rack (>= 0.4)
     rack-cors (1.0.6)
       rack (>= 1.6.0)
@@ -260,22 +262,21 @@ GEM
     rdf (1.0.8)
       addressable (>= 2.2)
     redcarpet (3.6.0)
-    redis (5.0.7)
-      redis-client (>= 0.9.0)
+    redis (4.8.1)
     redis-activesupport (5.3.0)
       activesupport (>= 3, < 8)
       redis-store (>= 1.3, < 2)
-    redis-client (0.17.0)
-      connection_pool
     redis-rack-cache (2.2.1)
       rack-cache (>= 1.10, < 2)
       redis-store (>= 1.6, < 2)
-    redis-store (1.10.0)
-      redis (>= 4, < 6)
+    redis-store (1.9.1)
+      redis (>= 4, < 5)
     representable (3.2.0)
       declarative (< 0.1.0)
       trailblazer-option (>= 0.1.1, < 0.2.0)
       uber (< 0.2.0)
+    request_store (1.5.1)
+      rack (>= 1.4)
     rest-client (2.1.0)
       http-accept (>= 1.7.0, < 2.0)
       http-cookie (>= 1.0.2, < 2.0)
@@ -340,6 +341,10 @@ GEM
       unicorn (>= 4, < 7)
     uuid (2.3.9)
       macaddr (~> 1.0)
+    webmock (3.19.1)
+      addressable (>= 2.8.0)
+      crack (>= 0.3.2)
+      hashdiff (>= 0.4.0, < 2.0.0)
     webrick (1.8.1)
 
 PLATFORMS
@@ -347,7 +352,7 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  activesupport (~> 3.0)
+  activesupport (~> 3.1)
   bcrypt_pbkdf (>= 1.0, < 2.0)
   bigdecimal (= 1.4.2)
   capistrano (~> 3)
@@ -375,7 +380,7 @@ DEPENDENCIES
   rack
   rack-accept (~> 0.4)
   rack-attack (~> 6.6.1)
-  rack-cache (~> 1.0)
+  rack-cache (~> 1.13.0)
   rack-cors
   rack-mini-profiler
   rack-post-body-to-params!
@@ -383,9 +388,11 @@ DEPENDENCIES
   rack-timeout
   rake (~> 10.0)
   redcarpet
-  redis
+  redis (~> 4.8.1)
   redis-activesupport
   redis-rack-cache (~> 2.0)
+  redis-store (= 1.9.1)
+  request_store
   shotgun!
   simplecov
   simplecov-cobertura
@@ -395,6 +402,7 @@ DEPENDENCIES
   sparql-client!
   unicorn
   unicorn-worker-killer
+  webmock
 
 BUNDLED WITH
    2.3.23