diff --git a/src/AccessControl/SecurityInfo.py b/src/AccessControl/SecurityInfo.py
index ed87984..a025d8a 100644
--- a/src/AccessControl/SecurityInfo.py
+++ b/src/AccessControl/SecurityInfo.py
@@ -78,7 +78,8 @@ def __init__(self):
     def _setaccess(self, names, access):
         for name in names:
             if self.names.get(name, access) != access:
-                LOG.warn('Conflicting security declarations for "%s"' % name)
+                LOG.warning(
+                    f'Conflicting security declarations for {name!r}')
                 self._warnings = 1
             self.names[name] = access
 
@@ -159,8 +160,8 @@ def setPermissionDefault(self, permission_name, roles):
         for role in roles:
             rdict[role] = 1
         if self.roles.get(permission_name, rdict) != rdict:
-            LOG.warn('Conflicting default role'
-                     'declarations for permission "%s"' % permission_name)
+            LOG.warning('Conflicting default role'
+                        ' declarations for permission "%s"' % permission_name)
             self._warnings = 1
         self.roles[permission_name] = rdict
 
@@ -248,8 +249,8 @@ def apply(self, classobj):
                     access)
 
         if getattr(self, '_warnings', None):
-            LOG.warn('Class "%s" had conflicting '
-                     'security declarations' % classobj.__name__)
+            LOG.warning('Class "%s" had conflicting'
+                        ' security declarations' % classobj.__name__)
 
 
 class ClassSecurityInformation(ClassSecurityInfo):
@@ -343,8 +344,8 @@ def apply(self, dict):
             dict['__allow_access_to_unprotected_subobjects__'] = self
 
         if getattr(self, '_warnings', None):
-            LOG.warn('Module "%s" had conflicting '
-                     'security declarations' % dict['__name__'])
+            LOG.warning('Module "%s" had conflicting'
+                        ' security declarations' % dict['__name__'])
 
     declareProtected__roles__ = ACCESS_PRIVATE
 
diff --git a/src/AccessControl/cAccessControl.c b/src/AccessControl/cAccessControl.c
index 33e763b..f733585 100644
--- a/src/AccessControl/cAccessControl.c
+++ b/src/AccessControl/cAccessControl.c
@@ -1071,7 +1071,7 @@ static PyObject *ZopeSecurityPolicy_validate(PyObject *self, PyObject *args) {
 	**| try:
 	**|    if roles is None or 'Anonymous' in roles: return 1
 	**| except TypeError:
-	**|     LOG.warn('"%s' passed as roles"
+	**|     LOG.warning('"%s' passed as roles"
 	**|		" during validation of '%s' is not a sequence." %
 	**|		('roles', name))
 	**|	raise
diff --git a/src/AccessControl/logger_wrapper.py b/src/AccessControl/logger_wrapper.py
index bf1e6ab..8f3c809 100644
--- a/src/AccessControl/logger_wrapper.py
+++ b/src/AccessControl/logger_wrapper.py
@@ -5,4 +5,4 @@
 
 
 LOG = getLogger('AccessControl')
-warn = LOG.warn
+warn = LOG.warning