diff --git a/tests/decode.test.js b/tests/decode.test.mjs
similarity index 99%
rename from tests/decode.test.js
rename to tests/decode.test.mjs
index 8fb100c..134b590 100644
--- a/tests/decode.test.js
+++ b/tests/decode.test.mjs
@@ -1,6 +1,6 @@
-const { deepEqual, throws } = require('assert');
-const { describe, it } = require('node:test');
-const { Decoders } = require('../');
+import { Decoders } from '@jwetzell/posistagenet';
+import { deepEqual, throws } from 'assert';
+import { describe, it } from 'node:test';
 
 const goodTests = [
   {
diff --git a/tests/encode.test.js b/tests/encode.test.mjs
similarity index 97%
rename from tests/encode.test.js
rename to tests/encode.test.mjs
index 33dd19e..400e825 100644
--- a/tests/encode.test.js
+++ b/tests/encode.test.mjs
@@ -1,6 +1,6 @@
-const { deepEqual, throws, equal } = require('assert');
-const { describe, it } = require('node:test');
-const { Encoders } = require('../');
+import { Encoders } from '@jwetzell/posistagenet';
+import { deepEqual, throws } from 'assert';
+import { describe, it } from 'node:test';
 
 const goodTests = [
   {