diff --git a/docs/main/changelog.rst b/docs/main/changelog.rst
index e254a743..b94cbbda 100644
--- a/docs/main/changelog.rst
+++ b/docs/main/changelog.rst
@@ -10,6 +10,7 @@ follows `Semantic versioning`_
 Development version
 -------------------
 - Add ``dependency_injector.injections`` module (C extension).
+- Transfer ``dependency_injector.utils`` module to Cython (C extension).
 - Transfer ``dependency_injector.errors`` module to Cython (C extension).
 - Remove ``@inject`` decorator.
 - Add makefile (``clean``, ``test``, ``build``, ``install``, ``uninstall`` 
diff --git a/setup.py b/setup.py
index c91dd47e..df827713 100644
--- a/setup.py
+++ b/setup.py
@@ -50,6 +50,10 @@ setup(name='dependency-injector',
                     ['src/dependency_injector/injections.c'],
                     define_macros=defined_macros,
                     extra_compile_args=['-O2']),
+          Extension('dependency_injector.utils',
+                    ['src/dependency_injector/utils.c'],
+                    define_macros=defined_macros,
+                    extra_compile_args=['-O2']),
           Extension('dependency_injector.errors',
                     ['src/dependency_injector/errors.c'],
                     define_macros=defined_macros,
diff --git a/src/dependency_injector/injections.pyx b/src/dependency_injector/injections.pyx
index 673360a1..39e41593 100644
--- a/src/dependency_injector/injections.pyx
+++ b/src/dependency_injector/injections.pyx
@@ -5,7 +5,7 @@ Powered by Cython.
 
 cimport cython
 
-from .utils import (
+from .utils cimport (
     is_provider,
     is_delegated,
 )
diff --git a/src/dependency_injector/utils.pxd b/src/dependency_injector/utils.pxd
new file mode 100644
index 00000000..6fb93278
--- /dev/null
+++ b/src/dependency_injector/utils.pxd
@@ -0,0 +1,16 @@
+"""Dependency injector utils.
+
+Powered by Cython.
+"""
+
+cpdef bint is_provider(object instance)
+
+cpdef object ensure_is_provider(object instance)
+
+cpdef bint is_delegated(object instance)
+
+cpdef bint is_container(object instance)
+
+cpdef str represent_provider(object provider, object provides)
+
+cpdef object deepcopy(object instance, dict memo=*)
diff --git a/src/dependency_injector/utils.py b/src/dependency_injector/utils.pyx
similarity index 69%
rename from src/dependency_injector/utils.py
rename to src/dependency_injector/utils.pyx
index 550fdcc1..8433389e 100644
--- a/src/dependency_injector/utils.py
+++ b/src/dependency_injector/utils.pyx
@@ -1,13 +1,16 @@
-"""Dependency injector utils module."""
+"""Dependency injector utils.
+
+Powered by Cython.
+"""
+
+cimport cpython.version
+
+from dependency_injector cimport errors
 
 import copy as _copy
 import types
 import threading
 
-import six
-
-from dependency_injector import errors
-
 
 GLOBAL_LOCK = threading.RLock()
 """Dependency injector global reentrant lock.
@@ -15,14 +18,19 @@ GLOBAL_LOCK = threading.RLock()
 :type: :py:class:`threading.RLock`
 """
 
-if six.PY2:  # pragma: no cover
+if cpython.version.PY_MAJOR_VERSION < 3:  # pragma: no cover
+    CLASS_TYPES = (type, types.ClassType)
+
     _copy._deepcopy_dispatch[types.MethodType] = \
         lambda obj, memo: type(obj)(obj.im_func,
                                     _copy.deepcopy(obj.im_self, memo),
                                     obj.im_class)
+else:  # pragma: no cover
+    CLASS_TYPES = (type,)
 
 
-def is_provider(instance):
+
+cpdef bint is_provider(object instance):
     """Check if instance is provider instance.
 
     :param instance: Instance to be checked.
@@ -30,12 +38,11 @@ def is_provider(instance):
 
     :rtype: bool
     """
-    return (not isinstance(instance, six.class_types) and
-            hasattr(instance, '__IS_PROVIDER__') and
-            getattr(instance, '__IS_PROVIDER__') is True)
+    return (not isinstance(instance, CLASS_TYPES) and
+            getattr(instance, '__IS_PROVIDER__', False) is True)
 
 
-def ensure_is_provider(instance):
+cpdef object ensure_is_provider(object instance):
     """Check if instance is provider instance and return it.
 
     :param instance: Instance to be checked.
@@ -52,7 +59,7 @@ def ensure_is_provider(instance):
     return instance
 
 
-def is_delegated(instance):
+cpdef bint is_delegated(object instance):
     """Check if instance is delegated provider.
 
     :param instance: Instance to be checked.
@@ -60,12 +67,11 @@ def is_delegated(instance):
 
     :rtype: bool
     """
-    return (not isinstance(instance, six.class_types) and
-            hasattr(instance, '__IS_DELEGATED__') and
-            getattr(instance, '__IS_DELEGATED__') is True)
+    return (not isinstance(instance, CLASS_TYPES) and
+            getattr(instance, '__IS_DELEGATED__', False) is True)
 
 
-def is_container(instance):
+cpdef bint is_container(object instance):
     """Check if instance is container instance.
 
     :param instance: Instance to be checked.
@@ -73,11 +79,10 @@ def is_container(instance):
 
     :rtype: bool
     """
-    return (hasattr(instance, '__IS_CONTAINER__') and
-            getattr(instance, '__IS_CONTAINER__', False) is True)
+    return getattr(instance, '__IS_CONTAINER__', False) is True
 
 
-def represent_provider(provider, provides):
+cpdef str represent_provider(object provider, object provides):
     """Return string representation of provider.
 
     :param provider: Provider object
@@ -96,6 +101,7 @@ def represent_provider(provider, provides):
         address=hex(id(provider)))
 
 
-def deepcopy(instance, memo=None):
+cpdef object deepcopy(object instance, dict memo=None):
     """Make full copy of instance."""
     return _copy.deepcopy(instance, memo)
+