diff --git a/chatmaild/pyproject.toml b/chatmaild/pyproject.toml
index 1fa8a774..079b4bc3 100644
--- a/chatmaild/pyproject.toml
+++ b/chatmaild/pyproject.toml
@@ -12,6 +12,7 @@ dependencies = [
   "deltachat-rpc-client",
   "filelock",
   "requests",
+  "crypt-r",
 ]
 
 [tool.setuptools]
diff --git a/chatmaild/src/chatmaild/doveauth.py b/chatmaild/src/chatmaild/doveauth.py
index ecaee00a..7aed3b52 100644
--- a/chatmaild/src/chatmaild/doveauth.py
+++ b/chatmaild/src/chatmaild/doveauth.py
@@ -1,9 +1,10 @@
-import crypt
 import json
 import logging
 import os
 import sys
 
+import crypt_r
+
 from .config import Config, read_config
 from .dictproxy import DictProxy
 from .migrate_db import migrate_from_db_to_maildir
@@ -13,7 +14,7 @@
 
 def encrypt_password(password: str):
     # https://doc.dovecot.org/configuration_manual/authentication/password_schemes/
-    passhash = crypt.crypt(password, crypt.METHOD_SHA512)
+    passhash = crypt_r.crypt(password, crypt_r.METHOD_SHA512)
     return "{SHA512-CRYPT}" + passhash