diff --git a/__tests__/github.proxy.test.ts b/__tests__/github.proxy.test.ts
index aa79f8b..e89966e 100644
--- a/__tests__/github.proxy.test.ts
+++ b/__tests__/github.proxy.test.ts
@@ -17,7 +17,7 @@ describe('@actions/github', () => {
   beforeAll(async () => {
     // Start proxy server
     proxyServer = proxy()
-    await new Promise(resolve => {
+    await new Promise<void>(resolve => {
       const port = Number(proxyUrl.split(':')[2])
       proxyServer.listen(port, () => resolve())
     })
@@ -32,7 +32,7 @@ describe('@actions/github', () => {
 
   afterAll(async () => {
     // Stop proxy server
-    await new Promise(resolve => {
+    await new Promise<void>(resolve => {
       proxyServer.once('close', () => resolve())
       proxyServer.close()
     })
diff --git a/__tests__/github.test.ts b/__tests__/github.test.ts
index 6a5b6be..1a68d58 100644
--- a/__tests__/github.test.ts
+++ b/__tests__/github.test.ts
@@ -13,9 +13,9 @@ describe('@actions/github', () => {
   beforeAll(async () => {
     // Start proxy server
     proxyServer = proxy()
-    await new Promise(resolve => {
+    await new Promise<void>(resolve => {
       const port = Number(proxyUrl.split(':')[2])
-      proxyServer.listen(port, () => resolve(null))
+      proxyServer.listen(port, () => resolve())
     })
     proxyServer.on('connect', req => {
       proxyConnects.push(req.url ?? '')
@@ -29,8 +29,8 @@ describe('@actions/github', () => {
 
   afterAll(async () => {
     // Stop proxy server
-    await new Promise(resolve => {
-      proxyServer.once('close', () => resolve(null))
+    await new Promise<void>(resolve => {
+      proxyServer.once('close', () => resolve())
       proxyServer.close()
     })