diff --git a/swh/auth/keycloak.py b/swh/auth/keycloak.py
--- a/swh/auth/keycloak.py
+++ b/swh/auth/keycloak.py
@@ -71,7 +71,11 @@
         Returns:
             A dictionary filled with OpenID Connect URIS.
         """
-        return self._keycloak.well_know()
+        try:
+            return self._keycloak.well_known()
+        except AttributeError:
+            # python-keycloak < 1.0.0
+            return self._keycloak.well_know()
 
     def authorization_url(self, redirect_uri: str, **extra_params: str) -> str:
         """
diff --git a/swh/auth/pytest_plugin.py b/swh/auth/pytest_plugin.py
--- a/swh/auth/pytest_plugin.py
+++ b/swh/auth/pytest_plugin.py
@@ -68,7 +68,7 @@
         self.realm_permissions = realm_permissions
         self.client_permissions = client_permissions
         self._keycloak.public_key = lambda: raw_realm_public_key
-        self._keycloak.well_know = lambda: {
+        self._keycloak.well_known = lambda: {
             "issuer": f"{self.server_url}realms/{self.realm_name}",
             "authorization_endpoint": (
                 f"{self.server_url}realms/"
@@ -99,6 +99,9 @@
                 "protocol/openid-connect/certs"
             ),
         }
+        # for python-keycloak < 1.0.0:
+        self._keycloak.well_know = self._keycloak.well_known
+
         self.set_auth_success(auth_success, oidc_profile, user_info)
 
     def decode_token(self, token):