diff --git a/packages/models-library/src/models_library/api_schemas_webserver/projects.py b/packages/models-library/src/models_library/api_schemas_webserver/projects.py
index a7d63904350..7c4116a136c 100644
--- a/packages/models-library/src/models_library/api_schemas_webserver/projects.py
+++ b/packages/models-library/src/models_library/api_schemas_webserver/projects.py
@@ -33,8 +33,8 @@
 class ProjectCreateNew(InputSchema):
     uuid: ProjectID | None = None  # NOTE: suggested uuid! but could be different!
     name: str
-    description: str | None
-    thumbnail: HttpUrl | None
+    description: str | None = None
+    thumbnail: HttpUrl | None = None
     workbench: NodesDict
     access_rights: dict[GroupIDStr, AccessRights]
     tags: list[int] = Field(default_factory=list)
@@ -55,8 +55,8 @@ class ProjectCreateNew(InputSchema):
 # NOTE: based on OVERRIDABLE_DOCUMENT_KEYS
 class ProjectCopyOverride(InputSchema):
     name: str
-    description: str | None
-    thumbnail: HttpUrl | None
+    description: str | None = None
+    thumbnail: HttpUrl | None = None
     prj_owner: LowerCaseEmailStr
 
     _empty_is_none = field_validator("thumbnail", mode="before")(
diff --git a/packages/models-library/src/models_library/api_schemas_webserver/projects_nodes.py b/packages/models-library/src/models_library/api_schemas_webserver/projects_nodes.py
index 7b65b84cb5f..81eaa893d60 100644
--- a/packages/models-library/src/models_library/api_schemas_webserver/projects_nodes.py
+++ b/packages/models-library/src/models_library/api_schemas_webserver/projects_nodes.py
@@ -19,7 +19,7 @@
 class NodeCreate(InputSchemaWithoutCamelCase):
     service_key: ServiceKey
     service_version: ServiceVersion
-    service_id: str | None
+    service_id: str | None = None
 
 
 BootOptions: TypeAlias = dict