diff --git a/src/hashzk.md b/src/hashzk.md
index 12dcf02..e3fda8f 100644
--- a/src/hashzk.md
+++ b/src/hashzk.md
@@ -30,17 +30,29 @@
     - [Encryption With Poseidon: Dima Khovratovich](https://drive.google.com/file/d/1EVrP3DzoGbmzkRmYnyEDcIQcXVU7GlOd/view)
     - [SAFE A tool box for Poseidon API](https://hackmd.io/bHgsH6mMStCVibM_wYvb2w?view)
       - [SAFE: Faster and simple hashing with ZKP](https://www.youtube.com/watch?v=w-4fzHpd4dk)
+    - [Poseidon security update](https://eprint.iacr.org/2023/537.pdf)
     - [Encoding of long objects in Poseidon - Dmitry Khovratovich](https://hackmd.io/@7dpNYqjKQGeYC7wMlPxHtQ/BkfS78Y9L)
     - [Talk Grassi](https://www.usenix.org/system/files/sec21_slides_grassi.pdf)
     - [Plonky2: Poseidon gate](https://medium.com/@wanghs.thu/into-poseidon-hash-37d03ef0b26e)
-    - [Penumbra: Poseidon Decaf377](https://protocol.penumbra.zone/main/crypto/poseidon/overview.html) 
+    - [Poseidon - short blog](https://hackmd.io/@wooju/halo2_poseidon_hash_1)
     - **Poseidon Implementations**
-      - [code: filecoin](https://github.com/filecoin-project/neptune/blob/master/spec/poseidon_spec.pdf)
+      - [Code: Original - Sage with param generation](https://extgit.iaik.tugraz.at/krypto/hadeshash)
+      - [Code: Horizen labs ](https://github.com/HorizenLabs/poseidon2/tree/main/plain_implementations/src/poseidon)
+      - [code: neptune](https://github.com/argumentcomputer/neptune)
         - [Poseidon in Filecoin - Dmitry Khovratovich](https://hackmd.io/@7dpNYqjKQGeYC7wMlPxHtQ/BJjaxXd9U)
       - [code: Ingonyama (python)](https://github.com/ingonyama-zk/poseidon-hash)
       - [code: Dusk network](https://github.com/dusk-network/Poseidon252)
       - [code: Dust network - Poseidon merkle](https://github.com/dusk-network/dusk-poseidon-merkle)
       - [code: Triplewz - GO](https://github.com/triplewz/poseidon)
+      - [code: Plonky2](https://github.com/0xPolygonZero/plonky2/blob/main/plonky2/src/hash/poseidon.rs)
+      - [code: arkworks sponge](https://github.com/arkworks-rs/crypto-primitives/tree/main/crypto-primitives/src/sponge)
+  - **Poseidon2**
+    - [Paper](https://eprint.iacr.org/2023/323.pdf)
+    - [Poseidon{2} in Noir](https://blog.taceo.io/poseidon2-for-noir/)
+    - [Poseidon2 in plonky3](https://hackmd.io/@sin7y/r1VOOG8bR?utm_source=preview-mode&utm_medium=rec#References)
+    - **Poseidon2 implementations**
+      - [code: Horizen labs](https://github.com/HorizenLabs/poseidon2/tree/main/plain_implementations/src/poseidon2)
+      - [code: Plonky3](https://github.com/Plonky3/Plonky3/blob/main/bn254-fr/src/poseidon2.rs)
   - **Rescue**
     - [Rescue-Prime: a Standard Specification (SoK)](https://eprint.iacr.org/2020/1143.pdf)
     - [Observations on Rescue](https://hackmd.io/@7dpNYqjKQGeYC7wMlPxHtQ/SJMVAPfjL)