diff --git a/units/en/unit8/additional-readings.mdx b/units/en/unit8/additional-readings.mdx
index 7425293..89196f9 100644
--- a/units/en/unit8/additional-readings.mdx
+++ b/units/en/unit8/additional-readings.mdx
@@ -13,7 +13,7 @@ These are **optional readings** if you want to go deeper.
 
 ## PPO Implementation details
 
-- [The 37 Implementation Details of Proximal Policy Optimization](https://ppo-details.cleanrl.dev//2021/11/05/ppo-implementation-details/)
+- [The 37 Implementation Details of Proximal Policy Optimization](https://iclr-blog-track.github.io/2022/03/25/ppo-implementation-details/)
 - [Part 1 of 3 — Proximal Policy Optimization Implementation: 11 Core Implementation Details](https://www.youtube.com/watch?v=MEt6rrxH8W4)
 
 ## Importance Sampling