diff --git a/src/lib.rs b/src/lib.rs
index 025ec79..c3fa95a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -118,6 +118,7 @@ impl ProofOfHeart {
 
         bump_instance_ttl(&env);
         set_admin(&env, &admin);
+        remove_pending_admin(&env);
         set_token(&env, &token);
         set_initialized(&env);
 
@@ -528,6 +529,7 @@ impl ProofOfHeart {
 
         bump_instance_ttl(&env);
         set_contribution(&env, campaign_id, &contributor, 0);
+        remove_revenue_claimed(&env, campaign_id, &contributor);
 
         let total_raised = get_total_raised_global(&env);
         set_total_raised_global(&env, total_raised - amount);
@@ -910,11 +912,53 @@ impl ProofOfHeart {
         get_personal_cap(&env, campaign_id, &contributor).unwrap_or(0)
     }
 
-    /// Transfers admin privileges to a new address.
+    /// Initiates transfer of admin privileges to a new address.
     ///
     /// # Authorization
     /// Requires the current admin to authorize the call.
-    pub fn update_admin(env: Env, admin: Address, new_admin: Address) -> Result<(), Error> {
+    pub fn initiate_admin_transfer(
+        env: Env,
+        admin: Address,
+        new_admin: Address,
+    ) -> Result<(), Error> {
+        admin.require_auth();
+        Self::require_not_paused(&env)?;
+
+        let current_admin = get_admin(&env);
+        if admin != current_admin {
+            return Err(Error::NotAuthorized);
+        }
+        if new_admin == current_admin {
+            return Err(Error::InvalidNewOwner);
+        }
+
+        bump_instance_ttl(&env);
+        set_pending_admin(&env, &new_admin);
+        env.events()
+            .publish(("admin_transfer_initiated",), (current_admin, new_admin));
+
+        Ok(())
+    }
+
+    /// Accepts a pending admin transfer. Must be called by the pending admin.
+    pub fn accept_admin_transfer(env: Env) -> Result<(), Error> {
+        Self::require_not_paused(&env)?;
+
+        let pending_admin = get_pending_admin(&env).ok_or(Error::NoTransferPending)?;
+        pending_admin.require_auth();
+
+        bump_instance_ttl(&env);
+        let old_admin = get_admin(&env);
+        set_admin(&env, &pending_admin);
+        remove_pending_admin(&env);
+        env.events()
+            .publish(("admin_updated",), (old_admin, pending_admin));
+
+        Ok(())
+    }
+
+    /// Cancels a pending admin transfer.
+    pub fn cancel_admin_transfer(env: Env, admin: Address) -> Result<(), Error> {
         admin.require_auth();
         Self::require_not_paused(&env)?;
 
@@ -922,15 +966,28 @@ impl ProofOfHeart {
         if admin != current_admin {
             return Err(Error::NotAuthorized);
         }
+        if get_pending_admin(&env).is_none() {
+            return Err(Error::NoTransferPending);
+        }
 
         bump_instance_ttl(&env);
-        set_admin(&env, &new_admin);
+        remove_pending_admin(&env);
         env.events()
-            .publish(("admin_updated",), (current_admin, new_admin));
+            .publish(("admin_transfer_cancelled",), current_admin);
 
         Ok(())
     }
 
+    /// Backwards-compatible wrapper that initiates two-step admin transfer.
+    pub fn update_admin(env: Env, admin: Address, new_admin: Address) -> Result<(), Error> {
+        Self::initiate_admin_transfer(env, admin, new_admin)
+    }
+
+    /// Returns the pending admin address if transfer is in progress.
+    pub fn get_pending_admin(env: Env) -> Option<Address> {
+        get_pending_admin(&env)
+    }
+
     /// Gets the number of recorded approval votes for a campaign.
     pub fn get_approve_votes(env: Env, campaign_id: u32) -> u32 {
         get_approve_votes(&env, campaign_id)
diff --git a/src/storage.rs b/src/storage.rs
index becf08f..5e7ed95 100644
--- a/src/storage.rs
+++ b/src/storage.rs
@@ -17,6 +17,8 @@ pub fn bump_instance_ttl(env: &Env) {
 pub enum DataKey {
     /// The global admin address.
     Admin,
+    /// Pending admin during two-step admin transfer.
+    PendingAdmin,
     /// The contract's accepted token address.
     Token,
     /// Platform fee in basis points (e.g. 300 = 3%).
@@ -127,6 +129,23 @@ pub fn set_admin(env: &Env, admin: &Address) {
     env.storage().instance().set(&DataKey::Admin, admin);
 }
 
+/// Returns the pending admin address if an admin transfer is in progress.
+pub fn get_pending_admin(env: &Env) -> Option<Address> {
+    env.storage().instance().get(&DataKey::PendingAdmin)
+}
+
+/// Stores the pending admin address for two-step admin transfer.
+pub fn set_pending_admin(env: &Env, pending_admin: &Address) {
+    env.storage()
+        .instance()
+        .set(&DataKey::PendingAdmin, pending_admin);
+}
+
+/// Clears any pending admin transfer.
+pub fn remove_pending_admin(env: &Env) {
+    env.storage().instance().remove(&DataKey::PendingAdmin);
+}
+
 /// Returns the accepted token address. Panics if not yet initialized.
 pub fn get_token(env: &Env) -> Address {
     env.storage().instance().get(&DataKey::Token).unwrap()
@@ -217,6 +236,12 @@ pub fn set_revenue_claimed(env: &Env, campaign_id: u32, contributor: &Address, a
         .extend_ttl(&key, BUMP_THRESHOLD, BUMP_AMOUNT);
 }
 
+/// Removes the revenue claimed record for a contributor in a campaign.
+pub fn remove_revenue_claimed(env: &Env, campaign_id: u32, contributor: &Address) {
+    let key = DataKey::RevenueClaimed(campaign_id, contributor.clone());
+    env.storage().persistent().remove(&key);
+}
+
 /// Returns the creator's total claimed revenue for a campaign, extending TTL if non-zero.
 pub fn get_creator_revenue_claimed(env: &Env, campaign_id: u32) -> i128 {
     let key = DataKey::CreatorRevenueClaimed(campaign_id);
diff --git a/src/test.rs b/src/test.rs
index 396a155..0497601 100644
--- a/src/test.rs
+++ b/src/test.rs
@@ -931,6 +931,7 @@ fn test_campaign_count_cannot_reset_after_deployment() {
     // Admin flows that must NOT reset the counter
     let new_admin = Address::generate(&env);
     client.update_admin(&admin, &new_admin);
+    client.accept_admin_transfer();
     assert_eq!(client.get_campaign_count(), 3);
 
     client.set_voting_params(&new_admin, &5, &7000);
@@ -2280,6 +2281,37 @@ fn test_deposit_revenue_non_existent_campaign() {
     assert_eq!(res.unwrap_err().unwrap(), Error::CampaignNotFound);
 }
 
+#[test]
+fn test_deposit_revenue_repeated_calls_accumulate_and_emit_events() {
+    let (env, _admin, creator, contributor1, _, _token, token_admin, client) = setup_env();
+
+    token_admin.mint(&contributor1, &5000);
+    token_admin.mint(&creator, &10_000);
+
+    let campaign_id = client.create_campaign(&CreateCampaignParams {
+        creator: creator.clone(),
+        title: String::from_str(&env, "Repeated Deposits"),
+        description: String::from_str(&env, "Deposit idempotency"),
+        funding_goal: 1000,
+        duration_days: 30,
+        category: Category::EducationalStartup,
+        has_revenue_sharing: true,
+        revenue_share_percentage: 2000,
+        max_contribution_per_user: 0i128,
+    });
+    client.verify_campaign(&campaign_id);
+    client.contribute(&campaign_id, &contributor1, &1000);
+    client.withdraw_funds(&campaign_id);
+
+    let events_before = env.events().all().len();
+    for _ in 0..10 {
+        client.deposit_revenue(&campaign_id, &100);
+    }
+    let events_after = env.events().all().len();
+    assert_eq!(client.get_revenue_pool(&campaign_id), 1000);
+    assert_eq!(events_after - events_before, 20);
+}
+
 // ── Issue 1: Validate refund state mutation order ────────────────────────────
 
 #[test]
@@ -2426,6 +2458,38 @@ fn test_claim_refund_expired_campaign() {
     client.claim_refund(&campaign_id, &contributor1);
     assert_eq!(client.get_contribution(&campaign_id, &contributor1), 0);
     assert_eq!(token.balance(&contributor1), 5000);
+    assert_eq!(client.get_revenue_claimed(&campaign_id, &contributor1), 0);
+}
+
+#[test]
+fn test_claim_refund_clears_existing_revenue_claimed_key() {
+    let (env, _admin, creator, contributor1, _, _token, token_admin, client) = setup_env();
+    token_admin.mint(&contributor1, &5000);
+    token_admin.mint(&creator, &10_000);
+
+    let campaign_id = client.create_campaign(&CreateCampaignParams {
+        creator: creator.clone(),
+        title: String::from_str(&env, "Refund Cleans Revenue Claim"),
+        description: String::from_str(&env, "Ensure RevenueClaimed key is removed"),
+        funding_goal: 5000,
+        duration_days: 30,
+        category: Category::EducationalStartup,
+        has_revenue_sharing: true,
+        revenue_share_percentage: 2000,
+        max_contribution_per_user: 0i128,
+    });
+    client.verify_campaign(&campaign_id);
+    client.contribute(&campaign_id, &contributor1, &1000);
+    client.deposit_revenue(&campaign_id, &1000);
+    client.claim_revenue(&campaign_id, &contributor1);
+
+    let claimed_before_refund = client.get_revenue_claimed(&campaign_id, &contributor1);
+    assert!(claimed_before_refund > 0);
+
+    client.cancel_campaign(&campaign_id);
+    client.claim_refund(&campaign_id, &contributor1);
+
+    assert_eq!(client.get_revenue_claimed(&campaign_id, &contributor1), 0);
 }
 
 // ── Issue 3: Fuzz/Integration tests for vote_on_campaign ─────────────────────
@@ -2599,6 +2663,63 @@ fn test_vote_on_cancelled_campaign_fails() {
     assert_eq!(res.unwrap_err().unwrap(), Error::CampaignNotActive);
 }
 
+#[test]
+fn test_vote_on_campaign_past_deadline_fails() {
+    let (env, _admin, creator, contributor1, _, _token, token_admin, client) = setup_env();
+    token_admin.mint(&contributor1, &1000);
+
+    let campaign_id = client.create_campaign(&CreateCampaignParams {
+        creator: creator.clone(),
+        title: String::from_str(&env, "Deadline Vote"),
+        description: String::from_str(&env, "Voting deadline gate"),
+        funding_goal: 1000,
+        duration_days: 1,
+        category: Category::Learner,
+        has_revenue_sharing: false,
+        revenue_share_percentage: 0,
+        max_contribution_per_user: 0i128,
+    });
+
+    let deadline = client.get_campaign(&campaign_id).deadline;
+    env.ledger().set(soroban_sdk::testutils::LedgerInfo {
+        timestamp: deadline + 1,
+        protocol_version: 22,
+        sequence_number: env.ledger().sequence(),
+        network_id: [0; 32],
+        base_reserve: 10,
+        min_temp_entry_ttl: 10,
+        min_persistent_entry_ttl: 10,
+        max_entry_ttl: 10,
+    });
+
+    let res = client.try_vote_on_campaign(&campaign_id, &contributor1, &true);
+    assert_eq!(res.unwrap_err().unwrap(), Error::CampaignNotActive);
+}
+
+#[test]
+fn test_vote_on_campaign_after_withdraw_fails() {
+    let (env, _admin, creator, contributor1, _, _token, token_admin, client) = setup_env();
+    token_admin.mint(&contributor1, &2000);
+
+    let campaign_id = client.create_campaign(&CreateCampaignParams {
+        creator: creator.clone(),
+        title: String::from_str(&env, "Withdrawn Vote"),
+        description: String::from_str(&env, "Voting withdrawn gate"),
+        funding_goal: 1000,
+        duration_days: 30,
+        category: Category::Learner,
+        has_revenue_sharing: false,
+        revenue_share_percentage: 0,
+        max_contribution_per_user: 0i128,
+    });
+    client.verify_campaign(&campaign_id);
+    client.contribute(&campaign_id, &contributor1, &1000);
+    client.withdraw_funds(&campaign_id);
+
+    let res = client.try_vote_on_campaign(&campaign_id, &contributor1, &true);
+    assert_eq!(res.unwrap_err().unwrap(), Error::CampaignNotActive);
+}
+
 #[test]
 fn test_vote_on_campaign_token_weighted() {
     let (env, _admin, creator, contributor1, contributor2, _token, token_admin, client) =
diff --git a/src/update_admin_test.rs b/src/update_admin_test.rs
index 1a970e5..d7c13f1 100644
--- a/src/update_admin_test.rs
+++ b/src/update_admin_test.rs
@@ -24,7 +24,13 @@ fn test_update_admin_success() {
 
     let res = client.try_update_admin(&admin, &new_admin);
     assert!(res.is_ok());
+    assert_eq!(client.get_admin(), admin);
+    assert_eq!(client.get_pending_admin(), Some(new_admin.clone()));
+
+    let accept_res = client.try_accept_admin_transfer();
+    assert!(accept_res.is_ok());
     assert_eq!(client.get_admin(), new_admin);
+    assert_eq!(client.get_pending_admin(), None);
 }
 
 #[test]
@@ -35,3 +41,17 @@ fn test_update_admin_rejects_non_admin() {
     let res = client.try_update_admin(&creator, &new_admin);
     assert_eq!(res.unwrap_err().unwrap(), Error::NotAuthorized);
 }
+
+#[test]
+fn test_cancel_admin_transfer() {
+    let (env, admin, _creator, client) = setup_env();
+    let new_admin = Address::generate(&env);
+
+    client.update_admin(&admin, &new_admin);
+    assert_eq!(client.get_pending_admin(), Some(new_admin));
+
+    let cancel_res = client.try_cancel_admin_transfer(&admin);
+    assert!(cancel_res.is_ok());
+    assert_eq!(client.get_pending_admin(), None);
+    assert_eq!(client.get_admin(), admin);
+}
diff --git a/src/voting.rs b/src/voting.rs
index e18d6ff..e0c4648 100644
--- a/src/voting.rs
+++ b/src/voting.rs
@@ -51,8 +51,11 @@ pub fn cast_vote(env: &Env, campaign_id: u32, voter: Address, approve: bool) ->
     voter.require_auth();
 
     let campaign = get_campaign_or_error(env, campaign_id)?;
-    require_unverified_campaign(&campaign)?;
     require_active_campaign(&campaign)?;
+    if env.ledger().timestamp() > campaign.deadline {
+        return Err(Error::CampaignNotActive);
+    }
+    require_unverified_campaign(&campaign)?;
 
     let balance = token::Client::new(env, &get_token(env)).balance(&voter);
     if balance <= 0 {