diff --git a/packages/artifact/__tests__/artifact-http-client.test.ts b/packages/artifact/__tests__/artifact-http-client.test.ts
index 91327114..37908111 100644
--- a/packages/artifact/__tests__/artifact-http-client.test.ts
+++ b/packages/artifact/__tests__/artifact-http-client.test.ts
@@ -35,7 +35,7 @@ describe('artifact-http-client', () => {
       msg.statusCode = 200
       return {
         message: msg,
-        readBody: () => {
+        readBody: async () => {
           return Promise.resolve(
             `{"ok": true, "signedUploadUrl": "http://localhost:8080/upload"}`
           )
@@ -72,7 +72,7 @@ describe('artifact-http-client', () => {
         msgSucceeded.statusCode = 200
         return {
           message: msgSucceeded,
-          readBody: () => {
+          readBody: async () => {
             return Promise.resolve(
               `{"ok": true, "signedUploadUrl": "http://localhost:8080/upload"}`
             )
@@ -85,7 +85,7 @@ describe('artifact-http-client', () => {
         msgFailed.statusMessage = 'Internal Server Error'
         return {
           message: msgFailed,
-          readBody: () => {
+          readBody: async () => {
             return Promise.resolve(`{"ok": false}`)
           }
         }
@@ -125,7 +125,7 @@ describe('artifact-http-client', () => {
       msgFailed.statusMessage = 'Internal Server Error'
       return {
         message: msgFailed,
-        readBody: () => {
+        readBody: async () => {
           return Promise.resolve(`{"ok": false}`)
         }
       }
@@ -165,7 +165,7 @@ describe('artifact-http-client', () => {
       msgFailed.statusMessage = 'Unauthorized'
       return {
         message: msgFailed,
-        readBody: () => {
+        readBody: async () => {
           return Promise.resolve(`{"ok": false}`)
         }
       }
diff --git a/packages/artifact/src/internal/shared/artifact-twirp-client.ts b/packages/artifact/src/internal/shared/artifact-twirp-client.ts
index e582db45..d2450183 100644
--- a/packages/artifact/src/internal/shared/artifact-twirp-client.ts
+++ b/packages/artifact/src/internal/shared/artifact-twirp-client.ts
@@ -17,9 +17,9 @@ interface Rpc {
 class ArtifactHttpClient implements Rpc {
   private httpClient: HttpClient
   private baseUrl: string
-  private maxAttempts: number = 5
-  private baseRetryIntervalMilliseconds: number = 3000
-  private retryMultiplier: number = 1.5
+  private maxAttempts = 5
+  private baseRetryIntervalMilliseconds = 3000
+  private retryMultiplier = 1.5
 
   constructor(
     userAgent: string,
@@ -52,14 +52,14 @@ class ArtifactHttpClient implements Rpc {
     contentType: 'application/json' | 'application/protobuf',
     data: object | Uint8Array
   ): Promise<object | Uint8Array> {
-    let url = `${this.baseUrl}/twirp/${service}/${method}`
-    let headers = {
+    const url = `${this.baseUrl}/twirp/${service}/${method}`
+    const headers = {
       'Content-Type': contentType
     }
     info(`Making request to ${url} with data: ${JSON.stringify(data)}`)
 
     try {
-      const response = await this.retryableRequest(() =>
+      const response = await this.retryableRequest(async () =>
         this.httpClient.post(url, JSON.stringify(data), headers)
       )
       const body = await response.readBody()