diff --git a/schemas/profile-functions.v1.schema.json b/schemas/profile-functions.v1.schema.json
index dd0f2698..d12a8db4 100644
--- a/schemas/profile-functions.v1.schema.json
+++ b/schemas/profile-functions.v1.schema.json
@@ -19,19 +19,19 @@
           "type": "string"
         },
         "project_id": {
-          "type": "integer"
+          "$ref": "#/definitions/UInt"
         },
         "received": {
-          "type": "integer"
+          "$ref": "#/definitions/UInt"
         },
         "release": {
           "type": "string"
         },
         "retention_days": {
-          "type": "integer"
+          "$ref": "#/definitions/UInt"
         },
         "timestamp": {
-          "type": "integer"
+          "$ref": "#/definitions/UInt"
         },
         "transaction_name": {
           "type": "string"
@@ -71,7 +71,14 @@
               "$ref": "#/definitions/UInt"
             }
           }
-        }
+        },
+        "required": [
+          "fingerprint",
+          "function",
+          "in_app",
+          "package",
+          "self_times_ns"
+        ]
       }
     },
     "UInt": {
diff --git a/schemas/profile-metadata.v1.schema.json b/schemas/profile-metadata.v1.schema.json
index 0c52be24..c69e9809 100644
--- a/schemas/profile-metadata.v1.schema.json
+++ b/schemas/profile-metadata.v1.schema.json
@@ -34,7 +34,7 @@
           "type": "string"
         },
         "duration_ns": {
-          "type": "integer"
+          "$ref": "#/definitions/UInt"
         },
         "environment": {
           "type": "string"
@@ -43,13 +43,13 @@
           "type": "string"
         },
         "organization_id": {
-          "type": "integer"
+          "$ref": "#/definitions/UInt"
         },
         "platform": {
           "type": "string"
         },
         "project_id": {
-          "type": "integer"
+          "$ref": "#/definitions/UInt"
         },
         "received": {
           "type": "integer"
@@ -92,6 +92,10 @@
         "version_code",
         "version_name"
       ]
+    },
+    "UInt": {
+      "type": "integer",
+      "minimum": 0
     }
   }
 }