diff --git a/apps/pv_opt/pv_opt.py b/apps/pv_opt/pv_opt.py
index 7999243..557ba2c 100644
--- a/apps/pv_opt/pv_opt.py
+++ b/apps/pv_opt/pv_opt.py
@@ -13,7 +13,7 @@
 import pvpy as pv
 from numpy import nan
 
-VERSION = "4.0.2"
+VERSION = "4.0.0"
 UNITS = {
     "current": "A",
     "power": "W",