diff --git a/README.rst b/README.rst
index c8ed5c080..2e6247a5e 100644
--- a/README.rst
+++ b/README.rst
@@ -43,6 +43,12 @@ Documentation
 A detailed `documentation <https://modoboa.readthedocs.io/>`_ will help you
 to install, use or extend Modoboa.
 
+*****************
+Demo Installation
+*****************
+
+If you want to try out Modoboa, check out our `demo installation <https://demo.modoboa.org/>`_.
+
 *************
 External code
 *************
diff --git a/doc/manual_installation/modoboa.rst b/doc/manual_installation/modoboa.rst
index e61d05d34..ff2205892 100644
--- a/doc/manual_installation/modoboa.rst
+++ b/doc/manual_installation/modoboa.rst
@@ -23,7 +23,7 @@ The following example illustrates how to realize this (Debian like system):
   > sudo useradd modoboa
   > sudo -i modoboa
   > virtualenv env
-  (env)> source env/bin/activate
+  > source env/bin/activate
   (env)> pip install -U pip
 
 Modoboa depends on external tools and some of them require compilation
diff --git a/ldap-requirements.txt b/ldap-requirements.txt
index 212b582a2..35eaac975 100644
--- a/ldap-requirements.txt
+++ b/ldap-requirements.txt
@@ -1 +1 @@
-django-auth-ldap
+django-auth-ldap>=1.2.13
diff --git a/modoboa/admin/forms/account.py b/modoboa/admin/forms/account.py
index 53e2ff5fe..7dedf3285 100644
--- a/modoboa/admin/forms/account.py
+++ b/modoboa/admin/forms/account.py
@@ -10,7 +10,7 @@ from django.core.urlresolvers import reverse
 from django.http import QueryDict
 from django.utils.translation import ugettext as _, ugettext_lazy
 
-from passwords.fields import PasswordField
+from django.contrib.auth import password_validation
 
 from modoboa.core import signals as core_signals
 from modoboa.core.models import User
@@ -45,11 +45,11 @@ class AccountFormGeneral(forms.ModelForm):
         choices=[("", ugettext_lazy("Choose"))],
         help_text=ugettext_lazy("What level of permission this user will have")
     )
-    password1 = PasswordField(
+    password1 = forms.CharField(
         label=ugettext_lazy("Password"), widget=forms.widgets.PasswordInput
     )
 
-    password2 = PasswordField(
+    password2 = forms.CharField(
         label=ugettext_lazy("Confirmation"),
         widget=forms.widgets.PasswordInput,
         help_text=ugettext_lazy(
@@ -157,6 +157,8 @@ class AccountFormGeneral(forms.ModelForm):
         if password1 != password2:
             raise forms.ValidationError(
                 _("The two password fields didn't match."))
+        if password2 != "":
+            password_validation.validate_password(password2, self.instance)
         return password2
 
     def clean(self):
@@ -181,9 +183,8 @@ class AccountFormGeneral(forms.ModelForm):
             raise lib_exceptions.PermDeniedException(
                 _("You can't disable your own account"))
         if commit:
-            if "password1" in self.cleaned_data \
-               and self.cleaned_data["password1"] != "":
-                account.set_password(self.cleaned_data["password1"])
+            if self.cleaned_data.get("password2", "") != "":
+                account.set_password(self.cleaned_data["password2"])
             account.save()
             account.role = self.cleaned_data["role"]
         return account
diff --git a/modoboa/admin/serializers.py b/modoboa/admin/serializers.py
index 878df8b05..6a12a4b06 100644
--- a/modoboa/admin/serializers.py
+++ b/modoboa/admin/serializers.py
@@ -7,8 +7,9 @@ from django.shortcuts import get_object_or_404
 from django.utils.translation import ugettext as _, ugettext_lazy
 from django.utils.encoding import force_text
 
+from django.contrib.auth import password_validation
+
 from rest_framework import serializers
-from passwords import validators
 
 from modoboa.admin import models as admin_models
 from modoboa.core import constants as core_constants
@@ -159,8 +160,7 @@ class AccountPasswordSerializer(serializers.ModelSerializer):
     def validate_new_password(self, value):
         """Check new password."""
         try:
-            validators.validate_length(value)
-            validators.complexity(value)
+            password_validation.validate_password(value, self.instance)
         except ValidationError as exc:
             raise serializers.ValidationError(exc.messages[0])
         return value
@@ -198,8 +198,7 @@ class WritableAccountSerializer(AccountSerializer):
     def validate_password(self, value):
         """Check password constraints."""
         try:
-            validators.validate_length(value)
-            validators.complexity(value)
+            password_validation.validate_password(value, self.instance)
         except ValidationError as exc:
             raise serializers.ValidationError(exc.messages[0])
         return value
diff --git a/modoboa/core/app_settings.py b/modoboa/core/app_settings.py
index 47742a503..327ae3af3 100644
--- a/modoboa/core/app_settings.py
+++ b/modoboa/core/app_settings.py
@@ -6,7 +6,7 @@ from django import forms
 from django.conf import settings
 from django.utils.translation import ugettext as _, ugettext_lazy
 
-from passwords import validators
+from django.contrib.auth import password_validation
 
 from modoboa.lib import fields as lib_fields
 from modoboa.lib.cryptutils import random_key
@@ -83,8 +83,7 @@ class GeneralParametersForm(param_forms.AdminParametersForm):
         label=ugettext_lazy("Default password"),
         initial="password",
         help_text=ugettext_lazy(
-            "Default password for automatically created accounts."),
-        validators=[validators.validate_length, validators.complexity]
+            "Default password for automatically created accounts.")
     )
 
     # LDAP specific settings
@@ -351,6 +350,12 @@ class GeneralParametersForm(param_forms.AdminParametersForm):
             raise forms.ValidationError(_("Invalid rounds number"))
         return value
 
+    def clean_default_password(self):
+        """Check password complexity."""
+        value = self.cleaned_data["default_password"]
+        password_validation.validate_password(value)
+        return value
+
     def clean(self):
         """Custom validation method
 
diff --git a/modoboa/core/commands/templates/settings.py.tpl b/modoboa/core/commands/templates/settings.py.tpl
index dcd50d733..2b9369149 100644
--- a/modoboa/core/commands/templates/settings.py.tpl
+++ b/modoboa/core/commands/templates/settings.py.tpl
@@ -178,15 +178,31 @@ REST_FRAMEWORK = {
 
 MODOBOA_API_URL = 'https://api.modoboa.org/1/'
 
-# django-passwords
+# Password validation rules
 
-PASSWORD_MIN_LENGTH = 8
-
-PASSWORD_COMPLEXITY = {
-    "UPPER": 1,
-    "LOWER": 1,
-    "DIGITS": 1
-}
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+    {
+        'NAME': 'modoboa.core.password_validation.ComplexityValidator',
+        'OPTIONS': {
+            'upper': 1,
+            'lower': 1,
+            'digits': 1,
+            'specials': 0
+        }
+    },
+]
 
 # CKeditor
 
diff --git a/modoboa/core/forms.py b/modoboa/core/forms.py
index 733d2374e..57875b749 100644
--- a/modoboa/core/forms.py
+++ b/modoboa/core/forms.py
@@ -11,7 +11,7 @@ from django.utils.translation import ugettext as _, ugettext_lazy
 from django.contrib.auth import forms as auth_forms
 from django.contrib.auth import get_user_model
 
-from passwords.fields import PasswordField
+from django.contrib.auth import password_validation
 
 from modoboa.core.models import User
 from modoboa.parameters import tools as param_tools
@@ -41,11 +41,11 @@ class ProfileForm(forms.ModelForm):
         label=ugettext_lazy("Old password"), required=False,
         widget=forms.PasswordInput(attrs={"class": "form-control"})
     )
-    newpassword = PasswordField(
+    newpassword = forms.CharField(
         label=ugettext_lazy("New password"), required=False,
         widget=forms.PasswordInput(attrs={"class": "form-control"})
     )
-    confirmation = PasswordField(
+    confirmation = forms.CharField(
         label=ugettext_lazy("Confirmation"), required=False,
         widget=forms.PasswordInput(attrs={"class": "form-control"})
     )
@@ -82,7 +82,8 @@ class ProfileForm(forms.ModelForm):
         confirmation = self.cleaned_data["confirmation"]
         if newpassword != confirmation:
             raise forms.ValidationError(_("Passwords mismatch"))
-        return self.cleaned_data["confirmation"]
+        password_validation.validate_password(confirmation, self.instance)
+        return confirmation
 
     def save(self, commit=True):
         user = super(ProfileForm, self).save(commit=False)
diff --git a/modoboa/core/password_validation.py b/modoboa/core/password_validation.py
new file mode 100644
index 000000000..e69dac511
--- /dev/null
+++ b/modoboa/core/password_validation.py
@@ -0,0 +1,68 @@
+"""Custom password validators."""
+
+from __future__ import unicode_literals
+
+from django.core.exceptions import ValidationError
+from django.utils.translation import ugettext as _, ungettext
+
+
+class ComplexityValidator(object):
+    """Check password contains at least a few things."""
+
+    def __init__(self, upper=1, lower=1, digits=1, specials=1):
+        self.upper = upper
+        self.lower = lower
+        self.digits = digits
+        self.specials = specials
+
+    def validate(self, password, user=None):
+        special_characters = "~!@#$%^&*()_+{}\":;,'[]"
+        condition = (
+            self.digits > 0 and
+            sum([1 for char in password if char.isdigit()]) < self.digits)
+        if condition:
+            raise ValidationError(
+                ungettext(
+                    "Password must contain at least {} digit.",
+                    "Password must contain at least {} digits.",
+                    self.digits
+                ).format(self.digits))
+        condition = (
+            self.lower > 0 and
+            sum([1 for char in password if char.islower()]) < self.lower)
+        if condition:
+            raise ValidationError(
+                ungettext(
+                    "Password must contain at least {} lowercase letter.",
+                    "Password must contain at least {} lowercase letters.",
+                    self.lower
+                )
+                .format(self.lower))
+        condition = (
+            self.upper > 0 and
+            sum([1 for char in password if char.isupper()]) < self.upper)
+        if condition:
+            raise ValidationError(
+                ungettext(
+                    "Password must contain at least {} uppercase letter.",
+                    "Password must contain at least {} uppercase letters.",
+                    self.upper
+                )
+                .format(self.upper))
+        condition = (
+            self.specials > 0 and
+            sum([1 for char in password if char in special_characters]) <
+            self.specials)
+        if condition:
+            raise ValidationError(
+                ungettext(
+                    "Password must contain at least {} special character.",
+                    "Password must contain at least {} special characters.",
+                    self.specials
+                )
+                .format(self.specials))
+
+    def get_help_text(self):
+        return _(
+            "Your password must contain a combination of different "
+            "character types.")
diff --git a/modoboa/lib/authbackends.py b/modoboa/lib/authbackends.py
index df9894f1e..995c24272 100644
--- a/modoboa/lib/authbackends.py
+++ b/modoboa/lib/authbackends.py
@@ -108,7 +108,7 @@ try:
         def authenticate(self, username, password):
             if self.global_params["authentication_type"] == "ldap":
                 return super(LDAPBackend, self).authenticate(
-                    username, password)
+                    username=username, password=password)
             return None
 
 except ImportError:
diff --git a/requirements.txt b/requirements.txt
index 08dcfb547..e8abbe4ee 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,5 @@
 django>=1.10,<=1.10.99
 django-ckeditor==5.2.1
-django-passwords==0.3.12
 django-reversion==1.10.2
 django-subcommand2==0.1.1
 django-versionfield2>=0.5.0
diff --git a/test_project/test_project/settings.py b/test_project/test_project/settings.py
index 7493ab588..a5f762ba8 100644
--- a/test_project/test_project/settings.py
+++ b/test_project/test_project/settings.py
@@ -87,6 +87,31 @@ AUTHENTICATION_BACKENDS = (
     'django.contrib.auth.backends.ModelBackend',
 )
 
+# Password validation rules
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+    {
+        'NAME': 'modoboa.core.password_validation.ComplexityValidator',
+        'OPTIONS': {
+            'upper': 1,
+            'lower': 1,
+            'digits': 1,
+            'specials': 0
+        }
+    },
+]
+
 TEMPLATES = [
     {
         'BACKEND': 'django.template.backends.django.DjangoTemplates',