diff --git a/pyproject.toml b/pyproject.toml
index 5424559..b55b6ca 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,7 @@ dependencies = [
     "pyramid_tm",
     "pyramid_retry",
     "requests >= 2.23",
-    "sqlalchemy",
+    "sqlalchemy < 2.0.0",
     "transaction >= 3.0.0",
     "waitress",
     "zope.sqlalchemy",