diff --git a/base_external_dbsource_mssql/__manifest__.py b/base_external_dbsource_mssql/__manifest__.py
index 3b49ce4e..2e18a3e0 100644
--- a/base_external_dbsource_mssql/__manifest__.py
+++ b/base_external_dbsource_mssql/__manifest__.py
@@ -9,7 +9,7 @@
     "website": "https://github.com/OCA/server-backend",
     "license": "LGPL-3",
     "depends": ["base_external_dbsource_sqlite"],
-    "external_dependencies": {"python": ["sqlalchemy", "pymssql"]},
+    "external_dependencies": {"python": ["sqlalchemy", "pymssql<=2.2.5"]},
     "demo": ["demo/base_external_dbsource.xml"],
     "installable": True,
 }
diff --git a/requirements.txt b/requirements.txt
index 768864bc..8ab07484 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 sqlalchemy
 mysqlclient==2.0.1
-pymssql
+pymssql<=2.2.5