diff --git a/packages/js/dist/server/server.js b/packages/js/dist/server/server.js
index c09a2a6c..5bf7561e 100644
--- a/packages/js/dist/server/server.js
+++ b/packages/js/dist/server/server.js
@@ -127,7 +127,7 @@ class SandboxServer {
         return this.config.port;
     }
     get rpcAddr() {
-        return `http://localhost:${this.port}`;
+        return `http://127.0.0.1:${this.port}`;
     }
     async start() {
         (0, internal_utils_1.debug)('Lifecycle.SandboxServer.start()');
diff --git a/packages/js/dist/utils.js b/packages/js/dist/utils.js
index 1a468567..d0a51868 100644
--- a/packages/js/dist/utils.js
+++ b/packages/js/dist/utils.js
@@ -102,7 +102,7 @@ function urlConfigFromNetwork(network) {
         case 'sandbox':
             return {
                 network: 'sandbox',
-                rpcAddr: 'http://localhost',
+                rpcAddr: 'http://127.0.0.1',
             };
         case 'custom':
             return {
diff --git a/packages/js/dist/worker.js b/packages/js/dist/worker.js
index 6ca8cfa3..a367c116 100644
--- a/packages/js/dist/worker.js
+++ b/packages/js/dist/worker.js
@@ -178,7 +178,7 @@ class SandboxWorker extends Worker {
             port,
             rm: false,
             refDir: null,
-            rpcAddr: `http://localhost:${port}`,
+            rpcAddr: `http://127.0.0.1:${port}`,
         };
     }
     get provider() {
@@ -201,7 +201,7 @@ class SandboxWorker extends Worker {
         };
     }
     get rpcAddr() {
-        return `http://localhost:${this.config.port}`;
+        return `http://127.0.0.1:${this.config.port}`;
     }
 }
 exports.SandboxWorker = SandboxWorker;
diff --git a/packages/js/src/server/server.ts b/packages/js/src/server/server.ts
index e8cf34e1..b2c4f637 100644
--- a/packages/js/src/server/server.ts
+++ b/packages/js/src/server/server.ts
@@ -131,7 +131,7 @@ export class SandboxServer {
   }
 
   get rpcAddr(): string {
-    return `http://localhost:${this.port}`;
+    return `http://127.0.0.1:${this.port}`;
   }
 
   async start(): Promise<SandboxServer> {
diff --git a/packages/js/src/utils.ts b/packages/js/src/utils.ts
index 0949c251..e4579a6d 100644
--- a/packages/js/src/utils.ts
+++ b/packages/js/src/utils.ts
@@ -81,7 +81,7 @@ export function urlConfigFromNetwork(network: string | {network: string; rpcAddr
     case 'sandbox':
       return {
         network: 'sandbox',
-        rpcAddr: 'http://localhost',
+        rpcAddr: 'http://127.0.0.1',
       };
 
     case 'custom':
diff --git a/packages/js/src/worker.ts b/packages/js/src/worker.ts
index 579cffd6..6f20b66e 100644
--- a/packages/js/src/worker.ts
+++ b/packages/js/src/worker.ts
@@ -200,7 +200,7 @@ export class SandboxWorker extends Worker {
       port,
       rm: false,
       refDir: null,
-      rpcAddr: `http://localhost:${port}`,
+      rpcAddr: `http://127.0.0.1:${port}`,
     };
   }
 
@@ -226,6 +226,6 @@ export class SandboxWorker extends Worker {
   }
 
   private get rpcAddr(): string {
-    return `http://localhost:${this.config.port}`;
+    return `http://127.0.0.1:${this.config.port}`;
   }
 }