diff --git a/php-8.3/vercel.json b/php-8.3/vercel.json
index bc94a64..ec9dd9e 100644
--- a/php-8.3/vercel.json
+++ b/php-8.3/vercel.json
@@ -1,10 +1,15 @@
 {
   "functions": {
     "api/index.php": {
-      "runtime": "vercel-php@0.7.1"
+      "runtime": "vercel-php@0.7.3"
     }
   },
   "routes": [
     { "src": "/(.*)", "dest": "/api/index.php" }
-  ]
+  ],
+  "build": {
+    "env": {
+      "NOW_PHP_DEBUG": "1"
+    }
+  }
 }
diff --git a/php-exec/vercel.json b/php-exec/vercel.json
index a250c6c..408f6d7 100644
--- a/php-exec/vercel.json
+++ b/php-exec/vercel.json
@@ -1,11 +1,16 @@
 {
   "functions": {
     "api/*.php": {
-      "runtime": "vercel-php@0.7.0"
+      "runtime": "vercel-php@0.7.3"
     }
   },
   "routes": [
     { "src": "/", "dest": "/api/index.php" },
     { "src": "/(.*)", "dest": "/api/$1.php" }
-  ]
+  ],
+  "build": {
+    "env": {
+      "NOW_PHP_DEBUG": "1"
+    }
+  }
 }