diff --git a/clients/js/src/generated/instructions/setAndVerifySizedCollectionItem.ts b/clients/js/src/generated/instructions/setAndVerifySizedCollectionItem.ts
index 7486a1d2..e29d0430 100644
--- a/clients/js/src/generated/instructions/setAndVerifySizedCollectionItem.ts
+++ b/clients/js/src/generated/instructions/setAndVerifySizedCollectionItem.ts
@@ -106,7 +106,7 @@ export function setAndVerifySizedCollectionItem(
     collection: { index: 5, isWritable: true, value: input.collection ?? null },
     collectionMasterEditionAccount: {
       index: 6,
-      isWritable: true,
+      isWritable: false,
       value: input.collectionMasterEditionAccount ?? null,
     },
     collectionAuthorityRecord: {
diff --git a/clients/rust/src/generated/instructions/set_and_verify_sized_collection_item.rs b/clients/rust/src/generated/instructions/set_and_verify_sized_collection_item.rs
index 30fbac6e..59d7857b 100644
--- a/clients/rust/src/generated/instructions/set_and_verify_sized_collection_item.rs
+++ b/clients/rust/src/generated/instructions/set_and_verify_sized_collection_item.rs
@@ -61,7 +61,7 @@ impl SetAndVerifySizedCollectionItem {
             self.collection,
             false,
         ));
-        accounts.push(solana_program::instruction::AccountMeta::new(
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
             self.collection_master_edition_account,
             false,
         ));
@@ -333,7 +333,7 @@ impl<'a, 'b> SetAndVerifySizedCollectionItemCpi<'a, 'b> {
             *self.collection.key,
             false,
         ));
-        accounts.push(solana_program::instruction::AccountMeta::new(
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
             *self.collection_master_edition_account.key,
             false,
         ));
diff --git a/clients/rust/src/utils.rs b/clients/rust/src/utils.rs
index 27ef0a5b..7d727ed2 100644
--- a/clients/rust/src/utils.rs
+++ b/clients/rust/src/utils.rs
@@ -1,4 +1,43 @@
+use borsh::BorshDeserialize;
+
+use crate::{
+    errors::MplTokenMetadataError,
+    types::{Key, TokenStandard},
+};
+
+/// The offset of the token standard byte in the master edition
+/// from the end of the account data.
+const TOKEN_STANDARD_OFFSET: usize = 1;
+
 /// Removes all null bytes from a string.
 pub fn clean(value: String) -> String {
     value.replace('\0', "")
 }
+
+/// Checks that the `master_edition` is Programmable NFT master edition.
+pub fn assert_edition_is_programmable(edition_data: &[u8]) -> Result<(), MplTokenMetadataError> {
+    if edition_data.len() > TOKEN_STANDARD_OFFSET {
+        // the first byte is the account key
+        let key = Key::deserialize(&mut &edition_data[0..1])
+            .map_err(|_error| MplTokenMetadataError::InvalidEditionKey)?;
+
+        return match key {
+            Key::MasterEditionV1 | Key::MasterEditionV2 => {
+                // the last byte is the token standard
+                let standard = TokenStandard::deserialize(
+                    &mut &edition_data[edition_data.len() - TOKEN_STANDARD_OFFSET..],
+                )
+                .map_err(|_error| MplTokenMetadataError::InvalidTokenStandard)?;
+
+                return match standard {
+                    TokenStandard::ProgrammableNonFungible
+                    | TokenStandard::ProgrammableNonFungibleEdition => Ok(()),
+                    _ => Err(MplTokenMetadataError::InvalidTokenStandard),
+                };
+            }
+            _ => Err(MplTokenMetadataError::InvalidEditionKey),
+        };
+    }
+
+    Err(MplTokenMetadataError::InvalidMasterEditionAccountLength)
+}
diff --git a/idls/token_metadata.json b/idls/token_metadata.json
index 00dff659..8ce75658 100644
--- a/idls/token_metadata.json
+++ b/idls/token_metadata.json
@@ -2288,7 +2288,7 @@
         },
         {
           "name": "collectionMasterEditionAccount",
-          "isMut": true,
+          "isMut": false,
           "isSigner": false,
           "docs": [
             "MasterEdition2 Account of the Collection Token"
diff --git a/programs/token-metadata/program/src/instruction/mod.rs b/programs/token-metadata/program/src/instruction/mod.rs
index 63f65a0d..413f8ba2 100644
--- a/programs/token-metadata/program/src/instruction/mod.rs
+++ b/programs/token-metadata/program/src/instruction/mod.rs
@@ -431,7 +431,7 @@ pub enum MetadataInstruction {
     #[account(3, name="update_authority", desc="Update Authority of Collection NFT and NFT")]
     #[account(4, name="collection_mint", desc="Mint of the Collection")]
     #[account(5, writable, name="collection", desc="Metadata Account of the Collection")]
-    #[account(6, writable, name="collection_master_edition_account", desc="MasterEdition2 Account of the Collection Token")]
+    #[account(6, name="collection_master_edition_account", desc="MasterEdition2 Account of the Collection Token")]
     #[account(7, optional, name="collection_authority_record", desc="Collection Authority Record PDA")]
     #[legacy_optional_accounts_strategy]
     SetAndVerifySizedCollectionItem,