diff --git a/apps/cli/src/linter/schema.ts b/apps/cli/src/linter/schema.ts
index 6761732..da484a3 100644
--- a/apps/cli/src/linter/schema.ts
+++ b/apps/cli/src/linter/schema.ts
@@ -138,10 +138,10 @@ const upstreamSchema = z
     timeout: timeoutSchema.optional(),
     tls: z
       .object({
-        client_cert: z.string(),
-        client_key: z.string(),
-        client_cert_id: z.string(),
-        verify: z.boolean(),
+        client_cert: z.string().optional(),
+        client_key: z.string().optional(),
+        client_cert_id: z.string().optional(),
+        verify: z.boolean().optional(),
       })
       .strict()
       .refine(
diff --git a/schema.json b/schema.json
index 40c1a11..efed54a 100644
--- a/schema.json
+++ b/schema.json
@@ -325,12 +325,6 @@
                     "type": "boolean"
                   }
                 },
-                "required": [
-                  "client_cert",
-                  "client_key",
-                  "client_cert_id",
-                  "verify"
-                ],
                 "additionalProperties": false
               },
               "keepalive_pool": {