diff --git a/lesson-5-software-composition-analysis/exercises/starter/vuln_app/requirements.txt b/lesson-5-software-composition-analysis/exercises/starter/vuln_app/requirements.txt
index 6b37c81..616fb50 100644
--- a/lesson-5-software-composition-analysis/exercises/starter/vuln_app/requirements.txt
+++ b/lesson-5-software-composition-analysis/exercises/starter/vuln_app/requirements.txt
@@ -1,6 +1,6 @@
 aiohttp-jinja2==1.1.0
 aiohttp-session==2.7.0
-aiohttp==4.0.0a0
+aiohttp==3.5.3
 aiopg==0.15.0
 aioredis==1.2.0
 async-timeout==3.0.1      # via aiohttp, aioredis