diff --git a/noir-projects/noir-contracts/contracts/card_game_contract/src/main.nr b/noir-projects/noir-contracts/contracts/card_game_contract/src/main.nr
index 095f870193b5..73497221da43 100644
--- a/noir-projects/noir-contracts/contracts/card_game_contract/src/main.nr
+++ b/noir-projects/noir-contracts/contracts/card_game_contract/src/main.nr
@@ -6,7 +6,7 @@ use dep::aztec::macros::aztec;
 #[aztec]
 contract CardGame {
     use dep::aztec::protocol_types::address::AztecAddress;
-    use dep::aztec::{hash::pedersen_hash, state_vars::{Map, PublicMutable}};
+    use dep::aztec::{hash::poseidon2_hash, state_vars::{Map, PublicMutable}};
 
     use dep::aztec::note::constants::MAX_NOTES_PER_PAGE;
 
@@ -99,7 +99,7 @@ contract CardGame {
 
         let mut collection = storage.collections.at(player);
         let _inserted_cards = collection.add_cards(cards, player);
-        CardGame::at(context.this_address()).on_cards_claimed(game, player, pedersen_hash(cards_fields, 0)).enqueue(&mut context);
+        CardGame::at(context.this_address()).on_cards_claimed(game, player, poseidon2_hash(cards_fields)).enqueue(&mut context);
     }
 
     #[public]
@@ -111,7 +111,7 @@ contract CardGame {
         assert(!game_data.claimed, "Already claimed");
         game_data.claimed = true;
 
-        assert_eq(cards_hash, pedersen_hash(game_data.rounds_cards.map(|card: Card| card.to_field()), 0));
+        assert_eq(cards_hash, poseidon2_hash(game_data.rounds_cards.map(|card: Card| card.to_field())));
 
         let winner = game_data.winner();
         assert(player.eq(winner.address), "Not the winner");
diff --git a/noir-projects/noir-contracts/contracts/easy_private_voting_contract/src/main.nr b/noir-projects/noir-contracts/contracts/easy_private_voting_contract/src/main.nr
index 55539d9e4b5c..1e641dd0c077 100644
--- a/noir-projects/noir-contracts/contracts/easy_private_voting_contract/src/main.nr
+++ b/noir-projects/noir-contracts/contracts/easy_private_voting_contract/src/main.nr
@@ -5,7 +5,7 @@ contract EasyPrivateVoting {
     // docs:start:imports
     use dep::aztec::prelude::{AztecAddress, Map, PublicMutable, SharedImmutable};
     use dep::aztec::{
-        keys::getters::get_public_keys,
+        hash::poseidon2_hash, keys::getters::get_public_keys,
         macros::{storage::storage, functions::{public, initializer, private, internal}}
     };
     // docs:end:imports
@@ -35,7 +35,7 @@ contract EasyPrivateVoting {
         let msg_sender_npk_m_hash = get_public_keys(context.msg_sender()).npk_m.hash();
 
         let secret = context.request_nsk_app(msg_sender_npk_m_hash); // get secret key of caller of function
-        let nullifier = std::hash::pedersen_hash([context.msg_sender().to_field(), secret]); // derive nullifier from sender and secret
+        let nullifier = poseidon2_hash([context.msg_sender().to_field(), secret]); // derive nullifier from sender and secret
         context.push_nullifier(nullifier);
         EasyPrivateVoting::at(context.this_address()).add_to_tally_public(candidate).enqueue(&mut context);
     }
diff --git a/noir-projects/noir-contracts/contracts/lending_contract/src/helpers.nr b/noir-projects/noir-contracts/contracts/lending_contract/src/helpers.nr
index c5e537e88edb..b7af91950be8 100644
--- a/noir-projects/noir-contracts/contracts/lending_contract/src/helpers.nr
+++ b/noir-projects/noir-contracts/contracts/lending_contract/src/helpers.nr
@@ -1,4 +1,4 @@
-use dep::aztec::hash::pedersen_hash;
+use dep::aztec::hash::poseidon2_hash;
 
 // Utility used to easily get a "id" for a private user that sits in the same
 // "space" as the public users.
@@ -7,7 +7,7 @@ pub fn compute_identifier(secret: Field, on_behalf_of: Field, self: Field) -> Fi
     // EITHER secret OR on_behalf_of MUST be set. But not both
     assert(!((secret == 0) as bool & (on_behalf_of == 0) as bool));
     if (secret != 0) {
-        pedersen_hash([self, secret], 0)
+        poseidon2_hash([self, secret])
     } else {
         on_behalf_of
     }
diff --git a/noir-projects/noir-contracts/contracts/nft_contract/src/main.nr b/noir-projects/noir-contracts/contracts/nft_contract/src/main.nr
index cb72da92eecf..6b2319f1c076 100644
--- a/noir-projects/noir-contracts/contracts/nft_contract/src/main.nr
+++ b/noir-projects/noir-contracts/contracts/nft_contract/src/main.nr
@@ -10,17 +10,17 @@ contract NFT {
     use dep::compressed_string::FieldCompressedString;
     use dep::aztec::{
         prelude::{NoteGetterOptions, NoteViewerOptions, Map, PublicMutable, SharedImmutable, PrivateSet, AztecAddress},
-        encrypted_logs::{encrypted_note_emission::encode_and_encrypt_note}, hash::pedersen_hash,
-        keys::getters::get_public_keys, note::constants::MAX_NOTES_PER_PAGE,
-        protocol_types::traits::is_empty, utils::comparison::Comparator,
-        protocol_types::{point::Point, traits::Serialize},
+        encrypted_logs::{encrypted_note_emission::encode_and_encrypt_note},
+        hash::poseidon2_hash_with_separator, keys::getters::get_public_keys,
+        note::constants::MAX_NOTES_PER_PAGE, protocol_types::traits::is_empty,
+        utils::comparison::Comparator, protocol_types::{point::Point, traits::Serialize},
         macros::{storage::storage, events::event, functions::{private, public, view, internal, initializer}}
     };
     use dep::authwit::auth::{assert_current_call_valid_authwit, assert_current_call_valid_authwit_public, compute_authwit_nullifier};
     use std::{embedded_curve_ops::EmbeddedCurvePoint, meta::derive};
     use crate::types::nft_note::NFTNote;
 
-    global TRANSIENT_STORAGE_SLOT_PEDERSEN_INDEX = 3;
+    global TRANSIENT_STORAGE_SLOT_POSEIDON_INDEX = 3;
 
     // TODO(#8467): Rename this to Transfer - calling this NFTTransfer to avoid export conflict with the Transfer event
     // in the Token contract.
@@ -153,15 +153,15 @@ contract NFT {
 
         // We make the msg_sender/transfer_preparer part of the slot preimage to ensure he cannot interfere with
         // non-sender's slots
-        let transfer_preparer_storage_slot_commitment: Field = pedersen_hash(
+        let transfer_preparer_storage_slot_commitment: Field = poseidon2_hash_with_separator(
             [context.msg_sender().to_field(), transient_storage_slot_randomness],
-            TRANSIENT_STORAGE_SLOT_PEDERSEN_INDEX
+            TRANSIENT_STORAGE_SLOT_POSEIDON_INDEX
         );
         // Then we hash the transfer preparer storage slot commitment with `from` and use that as the final slot
         // --> by hashing it with a `from` we ensure that `from` cannot interfere with slots not assigned to him.
-        let slot: Field = pedersen_hash(
+        let slot: Field = poseidon2_hash_with_separator(
             [from.to_field(), transfer_preparer_storage_slot_commitment],
-            TRANSIENT_STORAGE_SLOT_PEDERSEN_INDEX
+            TRANSIENT_STORAGE_SLOT_POSEIDON_INDEX
         );
 
         NFT::at(context.this_address())._store_point_in_transient_storage(hiding_point.inner, slot).enqueue(&mut context);
@@ -192,9 +192,9 @@ contract NFT {
 
         // Derive the slot from the transfer preparer storage slot commitment and the `from` address (declared
         // as `from` in this function)
-        let hiding_point_slot = pedersen_hash(
+        let hiding_point_slot = poseidon2_hash_with_separator(
             [from.to_field(), transfer_preparer_storage_slot_commitment],
-            TRANSIENT_STORAGE_SLOT_PEDERSEN_INDEX
+            TRANSIENT_STORAGE_SLOT_POSEIDON_INDEX
         );
 
         // Read the hiding point from "transient" storage and check it's not empty to ensure the transfer was prepared
diff --git a/noir-projects/noir-contracts/contracts/nft_contract/src/test/transfer_to_private.nr b/noir-projects/noir-contracts/contracts/nft_contract/src/test/transfer_to_private.nr
index 51350ae3adfe..b2cdae262ae5 100644
--- a/noir-projects/noir-contracts/contracts/nft_contract/src/test/transfer_to_private.nr
+++ b/noir-projects/noir-contracts/contracts/nft_contract/src/test/transfer_to_private.nr
@@ -1,7 +1,8 @@
 use crate::test::utils;
 use dep::aztec::{
-    hash::pedersen_hash, keys::getters::get_public_keys, prelude::{AztecAddress, NoteHeader},
-    oracle::unsafe_rand::unsafe_rand, protocol_types::storage::map::derive_storage_slot_in_map
+    hash::poseidon2_hash_with_separator, keys::getters::get_public_keys,
+    prelude::{AztecAddress, NoteHeader}, oracle::unsafe_rand::unsafe_rand,
+    protocol_types::storage::map::derive_storage_slot_in_map
 };
 use crate::{types::nft_note::NFTNote, NFT};
 
@@ -28,9 +29,9 @@ unconstrained fn transfer_to_private_to_a_different_account() {
     let note_randomness = unsafe_rand();
     let transient_storage_slot_randomness = unsafe_rand();
     // Sender will be the msg_sender/transfer_preparer in prepare_transfer_to_private
-    let transfer_preparer_storage_slot_commitment = pedersen_hash(
+    let transfer_preparer_storage_slot_commitment = poseidon2_hash_with_separator(
         [sender.to_field(), transient_storage_slot_randomness],
-        NFT::TRANSIENT_STORAGE_SLOT_PEDERSEN_INDEX
+        NFT::TRANSIENT_STORAGE_SLOT_POSEIDON_INDEX
     );
 
     // We prepare the transfer
@@ -90,9 +91,9 @@ unconstrained fn transfer_to_private_finalizing_from_incorrect_sender() {
     let note_randomness = unsafe_rand();
     let transient_storage_slot_randomness = unsafe_rand();
     // Sender will be the msg_sender/transfer_preparer in prepare_transfer_to_private
-    let transfer_preparer_storage_slot_commitment = pedersen_hash(
+    let transfer_preparer_storage_slot_commitment = poseidon2_hash_with_separator(
         [correct_sender.to_field(), transient_storage_slot_randomness],
-        NFT::TRANSIENT_STORAGE_SLOT_PEDERSEN_INDEX
+        NFT::TRANSIENT_STORAGE_SLOT_POSEIDON_INDEX
     );
 
     // We prepare the transfer
diff --git a/noir-projects/noir-contracts/contracts/nft_contract/src/test/utils.nr b/noir-projects/noir-contracts/contracts/nft_contract/src/test/utils.nr
index 7b95f3efda39..641a5e1753e8 100644
--- a/noir-projects/noir-contracts/contracts/nft_contract/src/test/utils.nr
+++ b/noir-projects/noir-contracts/contracts/nft_contract/src/test/utils.nr
@@ -1,6 +1,6 @@
 use dep::aztec::{
-    hash::pedersen_hash, keys::getters::get_public_keys, prelude::{AztecAddress, NoteHeader},
-    test::helpers::{cheatcodes, test_environment::TestEnvironment},
+    hash::poseidon2_hash_with_separator, keys::getters::get_public_keys,
+    prelude::{AztecAddress, NoteHeader}, test::helpers::{cheatcodes, test_environment::TestEnvironment},
     protocol_types::storage::map::derive_storage_slot_in_map,
     oracle::{execution::{get_block_number, get_contract_address}, unsafe_rand::unsafe_rand, storage::storage_read}
 };
@@ -52,9 +52,9 @@ unconstrained pub fn setup_mint_and_transfer_to_private(with_account_contracts:
 
     let note_randomness = unsafe_rand();
     let transient_storage_slot_randomness = unsafe_rand();
-    let transfer_preparer_storage_slot_commitment = pedersen_hash(
+    let transfer_preparer_storage_slot_commitment = poseidon2_hash_with_separator(
         [owner.to_field(), transient_storage_slot_randomness],
-        NFT::TRANSIENT_STORAGE_SLOT_PEDERSEN_INDEX
+        NFT::TRANSIENT_STORAGE_SLOT_POSEIDON_INDEX
     );
 
     // We prepare the transfer with user being both the sender and the recipient (classical "shield" flow)
diff --git a/noir-projects/noir-contracts/contracts/test_contract/src/main.nr b/noir-projects/noir-contracts/contracts/test_contract/src/main.nr
index e0df663feaa4..023f91ad5b97 100644
--- a/noir-projects/noir-contracts/contracts/test_contract/src/main.nr
+++ b/noir-projects/noir-contracts/contracts/test_contract/src/main.nr
@@ -19,7 +19,7 @@ contract Test {
     use dep::aztec::keys::getters::get_public_keys;
 
     use dep::aztec::{
-        hash::{pedersen_hash, compute_secret_hash, ArgsHasher}, keys::public_keys::IvpkM,
+        hash::{poseidon2_hash, compute_secret_hash, ArgsHasher}, keys::public_keys::IvpkM,
         note::{
         lifecycle::{create_note, destroy_note_unsafe}, note_getter::{get_notes, view_notes},
         note_getter_options::NoteStatus
@@ -466,7 +466,7 @@ contract Test {
         }
 
         fn get_commitment(self) -> Field {
-            pedersen_hash([self.amount, self.secret_hash], 0)
+            poseidon2_hash([self.amount, self.secret_hash])
         }
     }