diff --git a/.travis.yml b/.travis.yml
index b7c50da..bbdbe04 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
 language: ruby
 rvm:
   - 2.2.3
+services:
+  - memcached
 addons:
   apt:
     packages:
diff --git a/Gemfile b/Gemfile
index 8a579c5..b30ae89 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,3 +6,4 @@ gem 'rake'
 gem 'rails'
 gem 'rspec'
 gem 'mini_magick'
+gem 'dalli'
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index 9fdc381..5a0f6f6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,6 +46,7 @@ GEM
     builder (3.2.2)
     concurrent-ruby (1.0.2)
     concurrent-ruby (1.0.2-java)
+    dalli (2.7.6)
     diff-lcs (1.2.5)
     erubis (2.7.0)
     globalid (0.3.6)
@@ -125,6 +126,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  dalli
   mini_magick
   rails
   rake
diff --git a/lib/rucaptcha.rb b/lib/rucaptcha.rb
index 7ca293a..0c44b49 100644
--- a/lib/rucaptcha.rb
+++ b/lib/rucaptcha.rb
@@ -20,7 +20,11 @@ module RuCaptcha
       @config.cache_limit = 100
       @config.expires_in  = 2.minutes
       @config.style       = :colorful
-      @config.cache_store = Rails.application.config.cache_store
+      if Rails.application
+        @config.cache_store = Rails.application.config.cache_store
+      else
+        @config.cache_store = :null_store
+      end
       @config
     end
 
diff --git a/lib/rucaptcha/controller_helpers.rb b/lib/rucaptcha/controller_helpers.rb
index 771ed95..8b00eb1 100644
--- a/lib/rucaptcha/controller_helpers.rb
+++ b/lib/rucaptcha/controller_helpers.rb
@@ -31,7 +31,6 @@ module RuCaptcha
       end
 
       # Make sure not expire
-      puts "-------------- #{store_info.inspect}"
       if (Time.now.to_i - store_info[:time]) > RuCaptcha.config.expires_in
         return add_rucaptcha_validation_error
       end
diff --git a/spec/controller_helpers_spec.rb b/spec/controller_helpers_spec.rb
index bddf38c..0ec6ee8 100644
--- a/spec/controller_helpers_spec.rb
+++ b/spec/controller_helpers_spec.rb
@@ -19,11 +19,11 @@ describe RuCaptcha do
     end
 
     def custom_session
-      Rails.cache.read(self.rucaptcha_sesion_key_key)
+      RuCaptcha.cache.read(self.rucaptcha_sesion_key_key)
     end
 
     def clean_custom_session
-      Rails.cache.delete(self.rucaptcha_sesion_key_key)
+      RuCaptcha.cache.delete(self.rucaptcha_sesion_key_key)
     end
   end
 
@@ -59,7 +59,7 @@ describe RuCaptcha do
 
     context 'Correct chars in params' do
       it 'should work' do
-        Rails.cache.write(simple.rucaptcha_sesion_key_key, {
+        RuCaptcha.cache.write(simple.rucaptcha_sesion_key_key, {
           time: Time.now.to_i,
           code: 'abcd'
         })
@@ -67,7 +67,7 @@ describe RuCaptcha do
         expect(simple.verify_rucaptcha?).to eq(true)
         expect(simple.custom_session).to eq nil
 
-        Rails.cache.write(simple.rucaptcha_sesion_key_key, {
+        RuCaptcha.cache.write(simple.rucaptcha_sesion_key_key, {
           time: Time.now.to_i,
           code: 'abcd'
         })
@@ -78,7 +78,7 @@ describe RuCaptcha do
 
     describe 'Incorrect chars' do
       it 'should work' do
-        Rails.cache.write(simple.rucaptcha_sesion_key_key, {
+        RuCaptcha.cache.write(simple.rucaptcha_sesion_key_key, {
           time: Time.now.to_i - 60,
           code: 'abcd'
         })
@@ -90,7 +90,7 @@ describe RuCaptcha do
 
     describe 'Expires Session key' do
       it 'should work' do
-        Rails.cache.write(simple.rucaptcha_sesion_key_key, {
+        RuCaptcha.cache.write(simple.rucaptcha_sesion_key_key, {
           time: Time.now.to_i - 121,
           code: 'abcd'
         })
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 7549506..0e13a35 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -24,4 +24,5 @@ RuCaptcha.configure do
   self.len       = 2
   self.font_size = 48
   self.implode   = 0.111
+  self.cache_store = :mem_cache_store
 end