diff --git a/src/__tests__/http-test.js b/src/__tests__/http-test.js
index 8958f6b9..c9e29d0b 100644
--- a/src/__tests__/http-test.js
+++ b/src/__tests__/http-test.js
@@ -791,7 +791,7 @@ function urlString(urlParams?: ?{ [param: string]: mixed, ... }) {
         const req = request(app)
           .post(urlString())
           .set('Content-Type', 'application/graphql; charset=utf-16');
-        req.write(new Buffer('{ test(who: "World") }', 'utf16le'));
+        req.write(Buffer.from('{ test(who: "World") }', 'utf16le'));
         const response = await req;
 
         expect(JSON.parse(response.text)).to.deep.equal({
@@ -940,7 +940,7 @@ function urlString(urlParams?: ?{ [param: string]: mixed, ... }) {
         const req = request(app)
           .post(urlString())
           .set('Content-Type', 'application/graphql');
-        req.write(new Buffer('{ test(who: "World") }'));
+        req.write(Buffer.from('{ test(who: "World") }'));
         const response = await req;
 
         expect(JSON.parse(response.text)).to.deep.equal({
@@ -957,7 +957,7 @@ function urlString(urlParams?: ?{ [param: string]: mixed, ... }) {
         post(app, urlString(), graphqlHTTP({ schema: TestSchema }));
 
         const req = request(app).post(urlString());
-        req.write(new Buffer('{ test(who: "World") }'));
+        req.write(Buffer.from('{ test(who: "World") }'));
         const response = await req;
 
         expect(response.status).to.equal(400);
@@ -975,7 +975,7 @@ function urlString(urlParams?: ?{ [param: string]: mixed, ... }) {
         const req = request(app)
           .post(urlString())
           .set('Content-Type', 'application/graphql');
-        req.write(new Buffer('{ test(who: "World") }'));
+        req.write(Buffer.from('{ test(who: "World") }'));
         const response = await req;
 
         expect(response.status).to.equal(400);
diff --git a/src/index.js b/src/index.js
index 7751e69e..9f082948 100644
--- a/src/index.js
+++ b/src/index.js
@@ -504,7 +504,7 @@ function canDisplayGraphiQL(request: $Request, params: GraphQLParams): boolean {
  * Helper function for sending a response using only the core Node server APIs.
  */
 function sendResponse(response: $Response, type: string, data: string): void {
-  const chunk = new Buffer(data, 'utf8');
+  const chunk = Buffer.from(data, 'utf8');
   response.setHeader('Content-Type', type + '; charset=utf-8');
   response.setHeader('Content-Length', String(chunk.length));
   response.end(chunk);