diff --git a/spec/integration/synced_memory_store/synced_memory_store_spec.rb b/spec/integration/synced_memory_store/synced_memory_store_spec.rb
index c2640d4..c5f5d9a 100644
--- a/spec/integration/synced_memory_store/synced_memory_store_spec.rb
+++ b/spec/integration/synced_memory_store/synced_memory_store_spec.rb
@@ -13,14 +13,15 @@
   # In the test, we wait for the subscriber to make the test more predictable
   let(:logger) { ActiveSupport::TaggedLogging.new(Logger.new(STDOUT)) }
   let!(:subscriber) { SyncedMemoryStore::Subscriber.instance().tap {|i| i.configure(logger: logger).start(wait: true)} }
-  let!(:redis) { Redis.new(url: ENV['REDIS_URL']).tap { |r| r.flushdb }.client }
+  let!(:redis) { Redis.new.tap { |r| r.flushdb }.client }
   before(:each) { subscriber.reset! }
 
   context "using two isolated instances with a redis underlying cache" do
-    let(:cache_1) { ActiveSupport::Cache::RedisStore.new(ENV.fetch('REDIS_URL')) }
-    let(:cache_2) { ActiveSupport::Cache::RedisStore.new(ENV.fetch('REDIS_URL')) }
+    let(:cache_1) { ActiveSupport::Cache::RedisStore.new }
+    let(:cache_2) { ActiveSupport::Cache::RedisStore.new }
     let!(:instance_1) { SyncedMemoryStore::Store.new(cache: cache_1, redis: redis, subscriber: subscriber) }
     let!(:instance_2) { SyncedMemoryStore::Store.new(cache: cache_2, redis: redis, subscriber: subscriber) }
+
     it "Should add to instance 2 when a new key is added to instance 1" do
       instance_1.write("key_1", "key_1 value")
       wait_for { instance_2.fetch("key_1") }.to eq("key_1 value")
@@ -127,4 +128,4 @@
       expect(values).to eql("key_1" => "correct_value_for_key_1", "key_2" => "correct_value_for_key_2")
     end
   end
-end
\ No newline at end of file
+end
diff --git a/synced_memory_store.gemspec b/synced_memory_store.gemspec
index 982dee3..6ccb5bc 100644
--- a/synced_memory_store.gemspec
+++ b/synced_memory_store.gemspec
@@ -21,11 +21,11 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_development_dependency "bundler", "~> 1.14"
+  spec.add_development_dependency "bundler", "~> 2.0"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec", "~> 3.0"
   spec.add_development_dependency "rspec-wait", "~> 0.0"
   spec.add_development_dependency "redis-activesupport", " ~> 5.0"
-  spec.add_dependency "redis", "~> 3.3"
+  spec.add_dependency "redis", "~> 4.1"
   spec.add_dependency "activesupport", "~> 5"
 end