diff --git a/docs/changelog.rst b/docs/changelog.rst
index 61c8dda..c1da00d 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,6 +1,15 @@
 Changelog
 =========
 
+* release:`0.5.0 <2015-01-29>`
+* :feature:`-` improved logging of ldaptasks
+* :support:`-` update bpython to 0.13.2, add explicit dependency on requests
+  2.5.1
+* :support:`-` add explicit dependency for Pygments used by Sphinxdoc
+* :support:`-` remove pyyaml dependency as json is used for message
+  serialization
+* :support:`-` update to Django version 1.7.4
+
 * :release:`0.4.0 <2015-01-24>`
 * :feature:`-` add new task :py:func:`ldaptasks.tasks.set_ldap_user_password`
 
diff --git a/docs/conf.py b/docs/conf.py
index 9036feb..a6d6b4d 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -60,9 +60,9 @@ copyright = u'2014, 2015 Jan Dittberner'
 # built documents.
 #
 # The short X.Y version.
-version = '0.4'
+version = '0.5'
 # The full version, including alpha/beta/rc tags.
-release = '0.4.0'
+release = '0.5.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/gvaldap/ldaptasks/tasks.py b/gvaldap/ldaptasks/tasks.py
index a1af2c7..cf1a110 100644
--- a/gvaldap/ldaptasks/tasks.py
+++ b/gvaldap/ldaptasks/tasks.py
@@ -18,7 +18,13 @@ from ldapentities.models import (
 )
 
 
-_logger = get_task_logger(__name__)
+_LOGGER = get_task_logger(__name__)
+
+
+def log_and_reject(exception, message, *args):
+    logargs = list(args) + [exception.returncode, exception.output]
+    _LOGGER.error(message + "\nreturncode: %d\noutput:\n%s", *logargs)
+    raise Reject(message % args, requeue=False)
 
 
 @shared_task
@@ -38,14 +44,16 @@ def create_ldap_group(groupname, gid, descr):
     """
     try:
         ldapgroup = LdapGroup.objects.get(name=groupname)
-        _logger.info(
-            'ldap group with dn {0} already exists'.format(ldapgroup.dn)
-        )
+        _LOGGER.info(
+            'LDAP group %s with groupname %s already exists',
+            ldapgroup.dn, groupname)
         ldapgroup.gid = gid
     except LdapGroup.DoesNotExist:
         ldapgroup = LdapGroup(gid=gid, name=groupname)
+        _LOGGER.info('created LDAP group %s', ldapgroup.dn)
     ldapgroup.description = descr
     ldapgroup.save()
+    _LOGGER.info('set description of LDAP group %s', ldapgroup.dn)
     return ldapgroup.dn
 
 
@@ -75,16 +83,15 @@ def create_ldap_user(username, uid, gid, gecos, homedir, shell, password):
     """
     try:
         ldapuser = LdapUser.objects.get(username=username)
-        _logger.info(
-            'ldap user with dn {0} already exists'.format(ldapuser.dn)
-        )
+        _LOGGER.info(
+            'LDAP user %s with username %s already exists',
+            ldapuser.dn, username)
     except LdapUser.DoesNotExist:
         ldapuser = LdapUser(username=username)
     try:
         ldapgroup = LdapGroup.objects.get(gid=gid)
     except ObjectDoesNotExist as exc:
-        _logger.info('ldap group with gid {0} does not exist')
-        raise Reject(exc, requeue=False)
+        log_and_reject(exc, 'LDAP group with gid %d does not exist', gid)
     ldapuser.uid = uid
     ldapuser.group = gid
     ldapuser.gecos = gecos
@@ -94,14 +101,19 @@ def create_ldap_user(username, uid, gid, gecos, homedir, shell, password):
     ldapuser.common_name = username
     if password is not None:
         ldapuser.set_password(password)
+        _LOGGER.info('set password for LDAP user %s', ldapuser.dn)
     if ldapuser.username in ldapgroup.members:
-        _logger.info('user {0} is already member of {1}'.format(
-            ldapuser.username, ldapgroup.dn)
-        )
+        _LOGGER.info(
+            'LDAP user %s is already member of LDAP group %s',
+            ldapuser.dn, ldapgroup.dn)
     else:
         ldapgroup.members.append(ldapuser.username)
         ldapgroup.save()
+        _LOGGER.info(
+            'LDAP user %s has been added to LDAP group %s',
+            ldapuser.dn, ldapgroup.dn)
     ldapuser.save()
+    _LOGGER.info('LDAP user %s created', ldapuser.dn)
     return ldapuser.dn
 
 
@@ -120,9 +132,11 @@ def set_ldap_user_password(self, username, password):
     try:
         ldapuser = LdapUser.objects.get(username=username)
     except LdapUser.DoesNotExist:
+        _LOGGER.info('there is no LDAP user with username %s', username)
         return False
     ldapuser.set_password(password)
     ldapuser.save()
+    _LOGGER.info("set new password for LDAP user %s", ldapuser.dn)
     return True
 
 
@@ -145,18 +159,21 @@ def add_ldap_user_to_group(self, username, groupname):
         ldapgroup = LdapGroup.objects.get(name=groupname)
         ldapuser = LdapUser.objects.get(username=username)
     except LdapGroup.DoesNotExist:
-        _logger.error('ldap group {0} does not exist'.format(groupname))
+        _LOGGER.error('LDAP group with groupname %s does not exist', groupname)
     except LdapUser.DoesNotExist as exc:
-        _logger.error('ldap user {0} does not exist'.format(username))
+        _LOGGER.error('LDAP user with username %s does not exist', username)
         self.retry(exc=exc, time_limit=5)
     else:
-        if not ldapuser.username in ldapgroup.members:
+        if ldapuser.username not in ldapgroup.members:
             ldapgroup.members.append(ldapuser.username)
             ldapgroup.save()
-        else:
-            _logger.info('ldap user {0} is already in group {1}'.format(
+            _LOGGER.info(
+                'LDAP user %s has been added to LDAP group %s',
+                ldapuser.username, ldapgroup.dn)
+        else:
+            _LOGGER.info(
+                'LDAP user %s is already in LDAP group %s',
                 ldapuser.username, ldapgroup.dn)
-            )
         return True
     return False
 
@@ -172,13 +189,26 @@ def remove_ldap_user_from_group(username, groupname):
     :rtype: boolean
 
     """
-    ldapgroup = LdapGroup.objects.get(name=groupname)
-    ldapuser = LdapUser.objects.get(username=username)
-    performdelete = ldapuser.username in ldapgroup.members
-    if performdelete:
-        ldapgroup.members.remove(ldapuser.username)
-    ldapgroup.save()
-    return performdelete
+    try:
+        ldapgroup = LdapGroup.objects.get(name=groupname)
+        ldapuser = LdapUser.objects.get(username=username)
+    except LdapGroup.DoesNotExist:
+        _LOGGER.error('LDAP group with groupname %s does not exist', groupname)
+    except LdapUser.DoesNotExist:
+        _LOGGER.error('LDAP user with username %s does not exist', username)
+    else:
+        if ldapuser.username in ldapgroup.members:
+            ldapgroup.members.remove(ldapuser.username)
+            _LOGGER.info(
+                'removed LDAP user %s from LDAP group %s',
+                ldapuser.dn, ldapgroup.dn)
+            ldapgroup.save()
+            return True
+        else:
+            _LOGGER.info(
+                'LDAP user %s is not a member of LDAP group %s',
+                ldapuser.dn, ldapgroup.dn)
+    return False
 
 
 @shared_task
@@ -194,21 +224,24 @@ def delete_ldap_user(username):
     try:
         ldapuser = LdapUser.objects.get(username=username)
     except LdapUser.DoesNotExist:
-        _logger.info('there is no ldap user with uid {0}'.format(
-            username)
-        )
+        _LOGGER.info('there is no LDAP user with username %s', username)
     else:
         try:
             ldapgroup = LdapGroup.objects.get(gid=ldapuser.group)
         except LdapGroup.DoesNotExist:
-            _logger.info('group {0} for user {1} does not exist'.format(
-                ldapuser.group, ldapuser.username)
-            )
+            _LOGGER.info(
+                'LDAP group %s of LDAP user %s does not exist',
+                ldapuser.group, ldapuser.dn)
         else:
             if ldapuser.username in ldapgroup.members:
                 ldapgroup.members.remove(ldapuser.username)
                 ldapgroup.save()
+                _LOGGER.info(
+                    'removed LDAP user %s from LDAP group %s',
+                    ldapuser.dn, ldapgroup.dn)
+        userdn = ldapuser.dn
         ldapuser.delete()
+        _LOGGER.info('deleted LDAP user %s', userdn)
         return True
     return False
 
@@ -226,17 +259,18 @@ def delete_ldap_group_if_empty(groupname):
     try:
         ldapgroup = LdapGroup.objects.get(name=groupname)
     except LdapGroup.DoesNotExist:
-        _logger.info('ldap group with name {0} does not exist'.format(
-            groupname)
-        )
+        _LOGGER.info('LDAP group with groupname %s does not exist', groupname)
     else:
         if len(ldapgroup.members) == 0:
+            groupdn = ldapgroup.dn
             ldapgroup.delete()
+            _LOGGER.info(
+                'deleted LDAP group %s', groupdn)
             return True
         else:
-            _logger.info('ldap group {0} still has {1} members'.format(
+            _LOGGER.info(
+                'LDAP group %s has not been deleted. It still has %d members',
                 ldapgroup.dn, len(ldapgroup.members))
-            )
     return False
 
 
@@ -253,10 +287,10 @@ def delete_ldap_group(groupname):
     try:
         ldapgroup = LdapGroup.objects.get(name=groupname)
     except LdapGroup.DoesNotExist:
-        _logger.info('ldap group with name {0} does not exist'.format(
-            groupname)
-        )
+        _LOGGER.info('LDAP group with name %s does not exist', groupname)
     else:
+        groupdn = ldapgroup.dn
         ldapgroup.delete()
+        _LOGGER.info('deleted LDAP group %s', groupdn)
         return True
     return False
diff --git a/requirements/base.txt b/requirements/base.txt
index 17520d2..b42ce77 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -1,9 +1,9 @@
-Django==1.7.1
+Django==1.7.4
 django-ldapdb==0.3.2
-bpython==0.13.1
+bpython==0.13.2
 django-braces==1.4.0
 django-model-utils==2.2
 logutils==0.3.3
 celery==3.1.17
 passlib==1.6.2
-pyaml==14.12.10
+requests==2.5.1
diff --git a/requirements/local.txt b/requirements/local.txt
index 4bdfc63..af0d444 100644
--- a/requirements/local.txt
+++ b/requirements/local.txt
@@ -5,3 +5,4 @@ django-debug-toolbar==1.2.2
 Sphinx==1.2.3
 sqlparse==0.1.14
 releases==0.7.0
+Pygments==2.0.2