diff --git a/VERSION b/VERSION
index f374f666..2003b639 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.9.1
+0.9.2
diff --git a/dependency_injector/catalog.py b/dependency_injector/catalog.py
index e1de103a..86abe660 100644
--- a/dependency_injector/catalog.py
+++ b/dependency_injector/catalog.py
@@ -52,9 +52,9 @@ class AbstractCatalog(object):
     @classmethod
     def filter(cls, provider_type):
         """Return dict of providers, that are instance of provided type."""
-        return dict([(name, provider)
-                     for name, provider in six.iteritems(cls.providers)
-                     if isinstance(provider, provider_type)])
+        return dict((name, provider)
+                    for name, provider in six.iteritems(cls.providers)
+                    if isinstance(provider, provider_type))
 
     @classmethod
     def override(cls, overriding):
diff --git a/dependency_injector/injections.py b/dependency_injector/injections.py
index 2faac4bb..c5f81a06 100644
--- a/dependency_injector/injections.py
+++ b/dependency_injector/injections.py
@@ -54,11 +54,11 @@ def inject(*args, **kwargs):
     :type injection: Injection
     :return: (callable) -> (callable)
     """
-    injections = tuple((KwArg(name, value)
-                        for name, value in six.iteritems(kwargs)))
+    injections = tuple(KwArg(name, value)
+                       for name, value in six.iteritems(kwargs))
     if args:
-        injections += tuple((ensure_is_injection(injection)
-                             for injection in args))
+        injections += tuple(ensure_is_injection(injection)
+                            for injection in args)
 
     def decorator(callback):
         """Dependency injection decorator."""
diff --git a/dependency_injector/providers.py b/dependency_injector/providers.py
index b7ec57b6..40d4ec4c 100644
--- a/dependency_injector/providers.py
+++ b/dependency_injector/providers.py
@@ -108,18 +108,18 @@ class Factory(Provider):
             raise Error('Factory provider expects to get callable, ' +
                         'got {0} instead'.format(str(provides)))
         self._provides = provides
-        self._kwargs = tuple((injection
-                              for injection in injections
-                              if is_kwarg_injection(injection)))
+        self._kwargs = tuple(injection
+                             for injection in injections
+                             if is_kwarg_injection(injection))
         if kwargs:
-            self._kwargs += tuple((KwArg(name, value)
-                                  for name, value in six.iteritems(kwargs)))
-        self._attributes = tuple((injection
-                                  for injection in injections
-                                  if is_attribute_injection(injection)))
-        self._methods = tuple((injection
-                               for injection in injections
-                               if is_method_injection(injection)))
+            self._kwargs += tuple(KwArg(name, value)
+                                  for name, value in six.iteritems(kwargs))
+        self._attributes = tuple(injection
+                                 for injection in injections
+                                 if is_attribute_injection(injection))
+        self._methods = tuple(injection
+                              for injection in injections
+                              if is_method_injection(injection))
         super(Factory, self).__init__()
 
     def _provide(self, *args, **kwargs):
@@ -262,8 +262,8 @@ class Callable(Provider):
         if not callable(callback):
             raise Error('Callable expected, got {0}'.format(str(callback)))
         self._callback = callback
-        self._kwargs = tuple((KwArg(name, value)
-                              for name, value in six.iteritems(kwargs)))
+        self._kwargs = tuple(KwArg(name, value)
+                             for name, value in six.iteritems(kwargs))
         super(Callable, self).__init__()
 
     def _provide(self, *args, **kwargs):
diff --git a/docs/main/changelog.rst b/docs/main/changelog.rst
index 5e75448d..550aac63 100644
--- a/docs/main/changelog.rst
+++ b/docs/main/changelog.rst
@@ -13,6 +13,10 @@ Development version
 
 - No featues.
 
+0.9.2
+-----
+- Add minor refactorings.
+
 0.9.1
 -----
 - Add simplified syntax of kwarg injections for ``di.Factory`` and