diff --git a/usr/lib/python3.6/vmmgr/vmmgr.py b/usr/lib/python3.6/vmmgr/vmmgr.py
index 7176d02..c75a008 100644
--- a/usr/lib/python3.6/vmmgr/vmmgr.py
+++ b/usr/lib/python3.6/vmmgr/vmmgr.py
@@ -86,7 +86,9 @@ class VMMgr:
     def update_password(self, oldpassword, newpassword):
         # Update LUKS password and adminpwd for WSGI application
         pwinput = '{}\n{}'.format(oldpassword, newpassword).encode()
-        subprocess.run(['cryptsetup', 'luksChangeKey', '/dev/sda2'], input=pwinput, check=True)
+        partition_uuid = open('/etc/crypttab').read().split()[1][5:]
+        partition_name = subprocess.run(['/sbin/blkid', '-U', partition_uuid], check=True, stdout=subprocess.PIPE).stdout.decode().strip()
+        subprocess.run(['cryptsetup', 'luksChangeKey', partition_name], input=pwinput, check=True)
         # Update bcrypt-hashed password in config
         self.conf['host']['adminpwd'] = crypto.adminpwd_hash(newpassword)
         # Save config to file