diff --git a/README.md b/README.md
index da0e913..0440176 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+This project is a fork of the unmaintained repository [cfchou/serverless-python-individually](https://github.com/cfchou/serverless-python-individually)
+
+It fixes errors due to virtualenv en pip versions.
+
 # serverless-python-individually
 
 [![serverless](http://public.serverless.com/badges/v3.svg)](http://www.serverless.com)
diff --git a/index.js b/index.js
index 6770f21..870eaa2 100644
--- a/index.js
+++ b/index.js
@@ -315,10 +315,12 @@ pip3 install -U virtualenv && ${runPy}
 
     this.log('Installing packagings: ' + cmd.join(' '));
     const ret = ChildProcess.spawnSync(cmd[0], cmd.slice(1));
+    ret.stderr = ret.stderr || ''
+    ret.stdout = ret.stdout || ''
     this.log(ret.stderr.toString());
     this.log(ret.stdout.toString());
 
-    var isNotPipWarning = ret.stderr.indexOf('You are using pip version') < 0;
+    var isNotPipWarning = ret.stderr.indexOf('You are using pip version') < 0 && ret.stderr.indexOf('A new release of pip') < 0;
     if (ret.error || (ret.stderr.length != 0 && isNotPipWarning)) {
       this.log('Unhandled error in pip, not deploying to AWS.');
       return BbPromise.reject(ret.error)
diff --git a/requirements.py b/requirements.py
index 387b867..eb39f83 100644
--- a/requirements.py
+++ b/requirements.py
@@ -54,7 +54,7 @@
 sys.argv = ['', VENV_DIR]
 try:
     sys_stdout.write('creating virtualenv {}\n'.format(VENV_DIR).encode())
-    virtualenv.main()
+    virtualenv.cli_run([VENV_DIR])
 finally:
     sys.argv = original