diff --git a/index.js b/index.js
index <HASH>..<HASH> 100644
--- a/index.js
+++ b/index.js
@@ -29,7 +29,7 @@ class ServerlessPythonRequirements {
     return new BbPromise((resolve, reject) => {
       let cmd = 'pip';
       let options = [
-        'install',
+        '--isolated', 'install',
         '-t', '.requirements',
         '-r', 'requirements.txt',
       ];
Add missing `--isolated` flag

(cherry picked from commit 4dec<I>d3e<I>c<I>b<I>aa4d<I>a<I>de<I>)