diff --git a/src/bumpr.js b/src/bumpr.js
index 07f8fa7..d19f7b6 100644
--- a/src/bumpr.js
+++ b/src/bumpr.js
@@ -5,8 +5,8 @@ import fetch from 'node-fetch'
 import path from 'path'
 import Promise from 'promise'
 import replace from 'replace-in-file'
-import semverInc from 'semver/functions/inc'
-import semverPrerelease from 'semver/functions/prerelease'
+import semverInc from 'semver/functions/inc.js'
+import semverPrerelease from 'semver/functions/prerelease.js'
 import {readFileSync, writeFileSync} from 'fs'
 import pkgJson from '../package.json' assert {type: 'json'}
 import {createReadStream, exec, existsSync, readdir, statSync, writeFile} from './node-wrappers.js'