Pb installation des dépendances plugin Zigate

Bonjour
Après avoir fait une maj de firmware de la clé Zigate, j’ai voulu l’installer sur un Jeedom 4.1.19 sur RPi3B+ sous Buster.
L’installation des dépendances ne se fait pas correctement. Voici la fin du log :
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Reading package lists...
Building dependency tree...
Reading state information...
python3-dev is already the newest version (3.7.3-1).
The following packages were automatically installed and are no longer required:
python-bcrypt python-blinker python-fasteners python-idna python-jwt
python-lockfile python-monotonic python-nacl python-oauthlib python-openssl
python-paramiko python-pexpect python-ptyprocess python-pyasn1
python-urllib3
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 171 not upgraded.
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Requirement already satisfied: zigate==0.40.11 in /usr/local/lib/python3.7/dist-packages (0.40.11)
Requirement already satisfied: pyusb in /usr/lib/python3/dist-packages (from zigate==0.40.11) (1.0.2)
Requirement already satisfied: RPi.GPIO in /usr/lib/python3/dist-packages (from zigate==0.40.11) (0.7.0)
Requirement already satisfied: pydispatcher>=2.0.5 in /usr/local/lib/python3.7/dist-packages (from zigate==0.40.11) (2.0.5)
Requirement already satisfied: pyserial>=3.2 in /usr/lib/python3/dist-packages (from zigate==0.40.11) (3.4)
Requirement already satisfied: requests in /usr/lib/python3/dist-packages (from zigate==0.40.11) (2.21.0)
Requirement already satisfied: bottle in /usr/local/lib/python3.7/dist-packages (from zigate==0.40.11) (0.12.19)
Installation des dépendances terminée !
Vérification de la version installée
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/local/lib/python3.7/dist-packages/zigate/__init__.py", line 9, in <module>
from .core import (ZiGate, ZiGateWiFi, ZiGateGPIO)
File "/usr/local/lib/python3.7/dist-packages/zigate/core.py", line 16, in <module>
from .transport import (ThreadSerialConnection,
File "/usr/local/lib/python3.7/dist-packages/zigate/transport.py", line 12, in <module>
import serial.tools.list_ports
ModuleNotFoundError: No module named 'serial.tools'

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Merci d’avance pour votre aide.
Cordialement
Grebe