diff --git a/test_blake2b.js b/test_blake2b.js
index 3f9d7b9..7708d5e 100644
--- a/test_blake2b.js
+++ b/test_blake2b.js
@@ -26,7 +26,7 @@ test('Input types', function (t) {
   // Supports string, Uint8Array, and Buffer inputs
   // We already verify that blake2bHex('abc') produces the correct hash above
   t.equal(blake2bHex(new Uint8Array([97, 98, 99])), blake2bHex('abc'))
-  t.equal(blake2bHex(new Buffer([97, 98, 99])), blake2bHex('abc'))
+  t.equal(blake2bHex(Buffer.from([97, 98, 99])), blake2bHex('abc'))
   t.end()
 })
 
diff --git a/test_blake2s.js b/test_blake2s.js
index 8f9e922..6f1788a 100644
--- a/test_blake2s.js
+++ b/test_blake2s.js
@@ -14,7 +14,7 @@ test('BLAKE2s basic', function (t) {
     '508c5e8c327c14e2e1a72ba34eeb452f37458b209ed63a294d999b4c86675982')
   t.equal(blake2sHex(new Uint8Array([97, 98, 99])),
     '508c5e8c327c14e2e1a72ba34eeb452f37458b209ed63a294d999b4c86675982')
-  t.equal(blake2sHex(new Buffer([97, 98, 99])),
+  t.equal(blake2sHex(Buffer.from([97, 98, 99])),
     '508c5e8c327c14e2e1a72ba34eeb452f37458b209ed63a294d999b4c86675982')
   t.end()
 })
diff --git a/util.js b/util.js
index bf8c40a..1d84267 100644
--- a/util.js
+++ b/util.js
@@ -8,7 +8,7 @@ function normalizeInput (input) {
   } else if (input instanceof Buffer) {
     ret = new Uint8Array(input)
   } else if (typeof (input) === 'string') {
-    ret = new Uint8Array(new Buffer(input, 'utf8'))
+    ret = new Uint8Array(Buffer.from(input, 'utf8'))
   } else {
     throw new Error(ERROR_MSG_INPUT)
   }