diff --git a/manifest.toml b/manifest.toml
index 6ebaab8..dd5746a 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -87,7 +87,11 @@ ram.runtime = "50M"
     superadmin.label = "Super admin"
 
     [resources.apt]
-    packages = "gunicorn, python3, python3-venv, libpq-dev, libsasl2-dev, libjpeg-dev, libxml2-dev, libxslt1-dev, libpango1.0-0, postgresql, postgresql-contrib, postgresql-server-dev-13"
+    packages = ["gunicorn",
+        "python3", "python3-venv", "python3-dev",
+        "libpq-dev", "libsasl2-dev", "libjpeg-dev", "libxml2-dev", "libxslt1-dev", "libpango1.0-0",
+        "postgresql", "postgresql-contrib", "postgresql-server-dev-13",
+        "libldap2-dev"]
 
     [resources.database]
     type = "postgresql"