diff --git a/src/instruction.rs b/src/instruction.rs
index dade54e..a265ab0 100644
--- a/src/instruction.rs
+++ b/src/instruction.rs
@@ -17,6 +17,36 @@ use crate::{
 #[derive(Clone, Copy, Debug, Eq, PartialEq, ShankInstruction, TryFromPrimitive)]
 #[rustfmt::skip]
 pub enum OreInstruction {
+    #[account(0, name = "ore_program", desc = "Ore program")]
+    #[account(1, name = "signer", desc = "Signer", signer)]
+    #[account(2, name = "beneficiary", desc = "Beneficiary token account", writable)]
+    #[account(3, name = "proof", desc = "Ore proof account", writable)]
+    #[account(4, name = "treasury", desc = "Ore treasury account", writable)]
+    #[account(5, name = "treasury_tokens", desc = "Ore treasury token account", writable)]
+    #[account(6, name = "token_program", desc = "SPL token program")]
+    Claim = 0,
+
+    #[account(0, name = "ore_program", desc = "Ore program")]
+    #[account(1, name = "signer", desc = "Signer", signer)]
+    #[account(2, name = "proof", desc = "Ore proof account", writable)]
+    #[account(3, name = "system_program", desc = "Solana system program")]
+    Close = 1,
+
+    #[account(0, name = "ore_program", desc = "Ore program")]
+    #[account(1, name = "signer", desc = "Signer", signer)]
+    #[account(2, name = "bus", desc = "Ore bus account", writable)]
+    #[account(3, name = "config", desc = "Ore config account")]
+    #[account(4, name = "noise", desc = "Ore noise account")]
+    #[account(5, name = "proof", desc = "Ore proof account", writable)]
+    #[account(6, name = "slot_hashes", desc = "Solana slot hashes sysvar")]
+    Mine = 2,
+
+    #[account(0, name = "ore_program", desc = "Ore program")]
+    #[account(1, name = "signer", desc = "Signer", signer)]
+    #[account(2, name = "proof", desc = "Ore proof account", writable)]
+    #[account(3, name = "system_program", desc = "Solana system program")]
+    Open = 3,
+
     #[account(0, name = "ore_program", desc = "Ore program")]
     #[account(1, name = "signer", desc = "Signer", signer)]
     #[account(2, name = "bus_0", desc = "Ore bus account 0", writable)]
@@ -32,37 +62,7 @@ pub enum OreInstruction {
     #[account(12, name = "treasury", desc = "Ore treasury account", writable)]
     #[account(13, name = "treasury_tokens", desc = "Ore treasury token account", writable)]
     #[account(14, name = "token_program", desc = "SPL token program")]
-    Reset = 0,
-
-    #[account(0, name = "ore_program", desc = "Ore program")]
-    #[account(1, name = "signer", desc = "Signer", signer)]
-    #[account(2, name = "proof", desc = "Ore proof account", writable)]
-    #[account(3, name = "system_program", desc = "Solana system program")]
-    Open = 1,
-
-    #[account(0, name = "ore_program", desc = "Ore program")]
-    #[account(1, name = "signer", desc = "Signer", signer)]
-    #[account(2, name = "proof", desc = "Ore proof account", writable)]
-    #[account(3, name = "system_program", desc = "Solana system program")]
-    Close = 2,
-
-    #[account(0, name = "ore_program", desc = "Ore program")]
-    #[account(1, name = "signer", desc = "Signer", signer)]
-    #[account(2, name = "bus", desc = "Ore bus account", writable)]
-    #[account(3, name = "config", desc = "Ore config account")]
-    #[account(4, name = "noise", desc = "Ore noise account")]
-    #[account(5, name = "proof", desc = "Ore proof account", writable)]
-    #[account(6, name = "slot_hashes", desc = "Solana slot hashes sysvar")]
-    Mine = 3,
-
-    #[account(0, name = "ore_program", desc = "Ore program")]
-    #[account(1, name = "signer", desc = "Signer", signer)]
-    #[account(2, name = "beneficiary", desc = "Beneficiary token account", writable)]
-    #[account(3, name = "proof", desc = "Ore proof account", writable)]
-    #[account(4, name = "treasury", desc = "Ore treasury account", writable)]
-    #[account(5, name = "treasury_tokens", desc = "Ore treasury token account", writable)]
-    #[account(6, name = "token_program", desc = "SPL token program")]
-    Claim = 4,
+    Reset = 4,
 
     #[account(0, name = "ore_program", desc = "Ore program")]
     #[account(1, name = "signer", desc = "Signer", signer)]
@@ -71,6 +71,11 @@ pub enum OreInstruction {
     #[account(4, name = "treasury_tokens", desc = "Ore treasury token account", writable)]
     #[account(5, name = "token_program", desc = "SPL token program")]
     Stake = 5,
+    
+    #[account(0, name = "ore_program", desc = "Ore program")]
+    #[account(1, name = "signer", desc = "Signer", signer)]
+    #[account(2, name = "proof", desc = "Ore proof account", writable)]
+    Update = 6,
 
     #[account(0, name = "ore_program", desc = "Ore program")]
     #[account(1, name = "signer", desc = "Signer", signer)]
@@ -80,7 +85,7 @@ pub enum OreInstruction {
     #[account(5, name = "mint", desc = "Ore token mint account", writable)]
     #[account(6, name = "mint_v1", desc = "Ore v1 token mint account", writable)]
     #[account(7, name = "token_program", desc = "SPL token program")]
-    Upgrade = 6,
+    Upgrade = 7,
     
     #[account(0, name = "ore_program", desc = "Ore program")]
     #[account(1, name = "signer", desc = "Admin signer", signer)]
@@ -159,18 +164,6 @@ pub struct UpgradeArgs {
     pub amount: [u8; 8],
 }
 
-#[repr(C)]
-#[derive(Clone, Copy, Debug, Pod, Zeroable)]
-pub struct UpdateAdminArgs {
-    pub new_admin: Pubkey,
-}
-
-#[repr(C)]
-#[derive(Clone, Copy, Debug, Pod, Zeroable)]
-pub struct PauseArgs {
-    pub paused: u8,
-}
-
 impl_to_bytes!(InitializeArgs);
 impl_to_bytes!(OpenArgs);
 impl_to_bytes!(MineArgs);
@@ -220,7 +213,7 @@ pub fn open(signer: Pubkey, miner: Pubkey) -> Instruction {
         program_id: crate::id(),
         accounts: vec![
             AccountMeta::new(signer, true),
-            AccountMeta::new(miner, true),
+            AccountMeta::new_readonly(miner, false),
             AccountMeta::new(proof_pda.0, false),
             AccountMeta::new_readonly(solana_program::system_program::id(), false),
             AccountMeta::new_readonly(sysvar::slot_hashes::id(), false),
@@ -331,7 +324,21 @@ pub fn stake(signer: Pubkey, sender: Pubkey, amount: u64) -> Instruction {
     }
 }
 
-// build an upgrade instruction.
+// Build an update instruction.
+pub fn update(signer: Pubkey, miner: Pubkey) -> Instruction {
+    let proof = Pubkey::find_program_address(&[PROOF, signer.as_ref()], &crate::id()).0;
+    Instruction {
+        program_id: crate::id(),
+        accounts: vec![
+            AccountMeta::new(signer, true),
+            AccountMeta::new_readonly(miner, false),
+            AccountMeta::new(proof, false),
+        ],
+        data: OreInstruction::Update.to_vec(),
+    }
+}
+
+// Build an upgrade instruction.
 pub fn upgrade(signer: Pubkey, beneficiary: Pubkey, sender: Pubkey, amount: u64) -> Instruction {
     Instruction {
         program_id: crate::id(),
diff --git a/src/lib.rs b/src/lib.rs
index a5d064d..a6cf811 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -33,12 +33,13 @@ pub fn process_instruction(
         .ok_or(ProgramError::InvalidInstructionData)?;
 
     match OreInstruction::try_from(*tag).or(Err(ProgramError::InvalidInstructionData))? {
-        OreInstruction::Open => process_open(program_id, accounts, data)?,
+        OreInstruction::Claim => process_claim(program_id, accounts, data)?,
         OreInstruction::Close => process_close(program_id, accounts, data)?,
         OreInstruction::Mine => process_mine(program_id, accounts, data)?,
-        OreInstruction::Claim => process_claim(program_id, accounts, data)?,
-        OreInstruction::Stake => process_stake(program_id, accounts, data)?,
+        OreInstruction::Open => process_open(program_id, accounts, data)?,
         OreInstruction::Reset => process_reset(program_id, accounts, data)?,
+        OreInstruction::Stake => process_stake(program_id, accounts, data)?,
+        OreInstruction::Update => process_update(program_id, accounts, data)?,
         OreInstruction::Upgrade => process_upgrade(program_id, accounts, data)?,
         OreInstruction::Initialize => process_initialize(program_id, accounts, data)?,
     }
diff --git a/src/loaders.rs b/src/loaders.rs
index 8cc7e07..44a3ffe 100644
--- a/src/loaders.rs
+++ b/src/loaders.rs
@@ -319,15 +319,16 @@ pub fn load_uninitialized_pda<'a, 'info>(
         return Err(ProgramError::InvalidSeeds);
     }
 
-    load_uninitialized_account(info)
+    load_system_account(info, true)
 }
 
 /// Errors if:
 /// - Owner is not the system program.
 /// - Data is not empty.
 /// - Account is not writable.
-pub fn load_uninitialized_account<'a, 'info>(
+pub fn load_system_account<'a, 'info>(
     info: &'a AccountInfo<'info>,
+    is_writable: bool,
 ) -> Result<(), ProgramError> {
     if info.owner.ne(&system_program::id()) {
         return Err(ProgramError::InvalidAccountOwner);
@@ -337,7 +338,7 @@ pub fn load_uninitialized_account<'a, 'info>(
         return Err(ProgramError::AccountAlreadyInitialized);
     }
 
-    if !info.is_writable {
+    if is_writable && !info.is_writable {
         return Err(ProgramError::InvalidAccountData);
     }
 
diff --git a/src/processor/initialize.rs b/src/processor/initialize.rs
index 7717a5f..7c0b0af 100644
--- a/src/processor/initialize.rs
+++ b/src/processor/initialize.rs
@@ -80,7 +80,7 @@ pub fn process_initialize<'a, 'info>(
         &crate::id(),
     )?;
     load_uninitialized_pda(treasury_info, &[TREASURY], args.treasury_bump, &crate::id())?;
-    load_uninitialized_account(treasury_tokens_info)?;
+    load_system_account(treasury_tokens_info, true)?;
     load_program(system_program, system_program::id())?;
     load_program(token_program, spl_token::id())?;
     load_program(associated_token_program, spl_associated_token_account::id())?;
diff --git a/src/processor/mod.rs b/src/processor/mod.rs
index 91b8fb4..5ded886 100644
--- a/src/processor/mod.rs
+++ b/src/processor/mod.rs
@@ -5,6 +5,7 @@ mod mine;
 mod open;
 mod reset;
 mod stake;
+mod update;
 mod upgrade;
 
 pub use claim::*;
@@ -14,4 +15,5 @@ pub use mine::*;
 pub use open::*;
 pub use reset::*;
 pub use stake::*;
+pub use update::*;
 pub use upgrade::*;
diff --git a/src/processor/open.rs b/src/processor/open.rs
index f9ea4a7..3f03f61 100644
--- a/src/processor/open.rs
+++ b/src/processor/open.rs
@@ -43,7 +43,7 @@ pub fn process_open<'a, 'info>(
         return Err(ProgramError::NotEnoughAccountKeys);
     };
     load_signer(signer)?;
-    load_signer(miner_info)?;
+    load_system_account(miner_info, false)?;
     load_uninitialized_pda(
         proof_info,
         &[PROOF, signer.key.as_ref()],
diff --git a/src/processor/update.rs b/src/processor/update.rs
new file mode 100644
index 0000000..246c6d8
--- /dev/null
+++ b/src/processor/update.rs
@@ -0,0 +1,28 @@
+use solana_program::{
+    account_info::AccountInfo, entrypoint::ProgramResult, program_error::ProgramError,
+    pubkey::Pubkey,
+};
+
+use crate::{loaders::*, state::Proof, utils::AccountDeserialize};
+
+/// Update changes the miner authority on a proof account.
+pub fn process_update<'a, 'info>(
+    _program_id: &Pubkey,
+    accounts: &'a [AccountInfo<'info>],
+    _data: &[u8],
+) -> ProgramResult {
+    // Load accounts
+    let [signer, miner_info, proof_info] = accounts else {
+        return Err(ProgramError::NotEnoughAccountKeys);
+    };
+    load_signer(signer)?;
+    load_system_account(miner_info, false)?;
+    load_proof(proof_info, signer.key, true)?;
+
+    // Update the proof
+    let mut proof_data = proof_info.data.borrow_mut();
+    let proof = Proof::try_from_bytes_mut(&mut proof_data)?;
+    proof.miner = *miner_info.key;
+
+    Ok(())
+}