diff --git a/README.md b/README.md
index 543d87f..7f813f8 100644
--- a/README.md
+++ b/README.md
@@ -106,21 +106,32 @@ return [
 TESTING
 -------
 
-Tests are located in `tests` directory, developed with [Codeception PHP Testing Framework](http://codeception.com/).
-By default there are 3 test suites: `unit`, `functional` and `acceptance`. Tests can be executed by running
+Tests are located in `tests` directory. They are developed with [Codeception PHP Testing Framework](http://codeception.com/).
+By default there are 3 test suites:
 
-   ```
-   composer exec codecept run
-   ``` 
+- `unit`
+- `functional`
+- `acceptance`
 
-This will execute unit and functional tests. Unit tests are testing the system components, while functional tests are for testing user interaction.
-Acceptance tests are disabled by default as they require additional setup as they perform testing in real browser. 
+Tests can be executed by running
+
+```
+composer exec codecept run
+``` 
+
+The command above will execute unit and functional tests. Unit tests are testing the system components, while functional
+tests are for testing user interaction. Acceptance tests are disabled by default as they require additional setup since
+they perform testing in real browser. 
+
+
+### Running  acceptance tests
 
 To execute acceptance tests do the following:  
 
 1. Rename `tests/acceptance.suite.yml.example` to `tests/acceptance.suite.yml` to enable suite configuration
 
-2. Replace `codeception/base` package in `composer.json` with `codeception/codeception` to install full featured version of Codeception.
+2. Replace `codeception/base` package in `composer.json` with `codeception/codeception` to install full featured
+   version of Codeception
 
 3. Update dependencies with Composer 
 
@@ -162,8 +173,7 @@ To execute acceptance tests do the following:
    composer exec codecept run unit,functional
    ```
 
-Code coverage support
----------------------
+### Code coverage support
 
 By default, code coverage is disabled in `codeception.yml` configuration file, you should uncomment needed rows to be able
 to collect code coverage. You can run your tests and collect coverage with the following command:
@@ -179,4 +189,4 @@ composer exec codecept run unit --coverage-html --coverage-xml
 composer exec codecept run functional,unit --coverage-html --coverage-xml
 ```
 
-You can see code coverage output under the `tests/_output` directory.
\ No newline at end of file
+You can see code coverage output under the `tests/_output` directory.
diff --git a/composer.json b/composer.json
index ec9bcb4..d459e63 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
         "irc": "irc://irc.freenode.net/yii",
         "source": "https://github.com/yiisoft/yii2"
     },
-    "minimum-stability": "stable",
+    "minimum-stability": "dev",
     "require": {
         "php": ">=5.4.0",
         "yiisoft/yii2": ">=2.0.5",
@@ -21,11 +21,11 @@
     },
     "require-dev": {
         "codeception/base": "^2.2.3",
-        "codeception/verify": "*",
+        "codeception/verify": "~0.3.1",
         "yiisoft/yii2-debug": "*",
         "yiisoft/yii2-gii": "*",
         "yiisoft/yii2-faker": "*",
-        "codeception/specify": "*"
+        "codeception/specify": "~0.4.3"
     },
     "config": {
         "process-timeout": 1800
diff --git a/tests/functional/ContactFormCest.php b/tests/functional/ContactFormCest.php
index a874317..7f198bf 100644
--- a/tests/functional/ContactFormCest.php
+++ b/tests/functional/ContactFormCest.php
@@ -26,11 +26,11 @@ class ContactFormCest
     public function submitFormWithIncorrectEmail(\FunctionalTester $I)
     {
         $I->submitForm('#contact-form', [
-            'ContactForm[name]'			=>	'tester',
-            'ContactForm[email]'	    =>	'tester.email',
-            'ContactForm[subject]'		=>	'test subject',
-            'ContactForm[body]'			=>	'test content',
-            'ContactForm[verifyCode]'	=>	'testme',
+            'ContactForm[name]' => 'tester',
+            'ContactForm[email]' => 'tester.email',
+            'ContactForm[subject]' => 'test subject',
+            'ContactForm[body]' => 'test content',
+            'ContactForm[verifyCode]' => 'testme',
         ]);
         $I->expectTo('see that email address is wrong');
         $I->dontSee('Name cannot be blank', '.help-inline');
@@ -43,11 +43,11 @@ class ContactFormCest
     public function submitFormSuccessfully(\FunctionalTester $I)
     {
         $I->submitForm('#contact-form', [
-            'ContactForm[name]'			=>	'tester',
-            'ContactForm[email]'	    =>	'tester@example.com',
-            'ContactForm[subject]'		=>	'test subject',
-            'ContactForm[body]'			=>	'test content',
-            'ContactForm[verifyCode]'	=>	'testme',
+            'ContactForm[name]' => 'tester',
+            'ContactForm[email]' => 'tester@example.com',
+            'ContactForm[subject]' => 'test subject',
+            'ContactForm[body]' => 'test content',
+            'ContactForm[verifyCode]' => 'testme',
         ]);
         $I->seeEmailIsSent();
         $I->dontSeeElement('#contact-form');