diff --git a/src/schemas/json/cargo.json b/src/schemas/json/cargo.json
index f5cb8f5a6cd..ba245457eb4 100644
--- a/src/schemas/json/cargo.json
+++ b/src/schemas/json/cargo.json
@@ -214,6 +214,7 @@
           }
         }
       },
+      "minProperties": 1,
       "additionalProperties": false,
       "x-taplo": {
         "initFields": ["version"]
@@ -1501,7 +1502,9 @@
           "type": "boolean",
           "enum": [true]
         }
-      }
+      },
+      "required": ["workspace"],
+      "additionalProperties": false
     },
     "PlaydateMetadata": {
       "title": "Playdate Package Metadata",
@@ -1913,6 +1916,7 @@
               "description": "Inherit lints from the workspace manifest."
             }
           },
+          "required": ["workspace"],
           "additionalProperties": false
         }
       ],