diff --git a/.github/workflows/smoke-ci.yml b/.github/workflows/smoke-ci.yml
index 36d234f05..e1dde811f 100644
--- a/.github/workflows/smoke-ci.yml
+++ b/.github/workflows/smoke-ci.yml
@@ -26,10 +26,15 @@ jobs:
           grep -Eq '^/contracts/lending/\s+@MettaChain/lending$' .github/CODEOWNERS
           grep -Eq '^/contracts/oracle/\s+@MettaChain/oracle$' .github/CODEOWNERS
 
-      - name: Install Stable Rust Toolchain
+      - name: Install Nightly Rust Toolchain (for fmt)
+        uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rustfmt
+
+      - name: Install Stable Rust Toolchain (for clippy & test)
         uses: dtolnay/rust-toolchain@stable
         with:
-          components: rustfmt, clippy
+          components: clippy
 
       - name: Cache Cargo Build Artifacts
         uses: actions/cache@v4
@@ -44,8 +49,8 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-cargo-smoke-
 
-      - name: Check Code Formatting Style (fmt)
-        run: cargo fmt --check
+      - name: Check Code Formatting Style (nightly fmt)
+        run: cargo +nightly fmt --check
 
       - name: Execute Static Analysis Compiler Lints (clippy)
         run: cargo clippy --all-targets --all-features -- -D warnings
diff --git a/contracts/bridge/src/lib.rs b/contracts/bridge/src/lib.rs
index 688383217..a8766efe1 100644
--- a/contracts/bridge/src/lib.rs
+++ b/contracts/bridge/src/lib.rs
@@ -18,9 +18,10 @@ use scale_info::prelude::vec::Vec;
 
 #[ink::contract]
 mod bridge {
-    use super::*;
     use propchain_traits::{non_reentrant, ReentrancyError, ReentrancyGuard};
 
+    use super::*;
+
     include!("errors.rs");
 
     /// Maximum number of entries kept in [`PropertyBridge::pause_audit_log`].
diff --git a/contracts/compliance_registry/lib.rs b/contracts/compliance_registry/lib.rs
index cbcc76c48..d46e46499 100644
--- a/contracts/compliance_registry/lib.rs
+++ b/contracts/compliance_registry/lib.rs
@@ -6,16 +6,16 @@
     dead_code
 )]
 
-use propchain_traits::ComplianceChecker;
-use propchain_traits::*;
+use propchain_traits::{ComplianceChecker, *};
 
 #[ink::contract]
 mod compliance_registry {
-    use super::*;
     use ink::prelude::vec::Vec;
     use ink::storage::Mapping;
     use propchain_traits::ComplianceOperation;
 
+    use super::*;
+
     /// Represents the verification status of a user
     #[derive(Debug, PartialEq, Eq, Clone, Copy, scale::Encode, scale::Decode)]
     #[cfg_attr(
diff --git a/contracts/crowdfunding/src/lib.rs b/contracts/crowdfunding/src/lib.rs
index add14ae93..ee2e9cc5e 100644
--- a/contracts/crowdfunding/src/lib.rs
+++ b/contracts/crowdfunding/src/lib.rs
@@ -10,8 +10,10 @@ use ink::storage::Mapping;
 
 #[ink::contract]
 mod propchain_crowdfunding {
+    use ink::prelude::string::String;
+    use ink::prelude::vec::Vec;
+
     use super::*;
-    use ink::prelude::{string::String, vec::Vec};
 
     #[derive(Debug, PartialEq, Eq, scale::Encode, scale::Decode)]
     #[cfg_attr(feature = "std", derive(scale_info::TypeInfo))]
@@ -1428,11 +1430,12 @@ pub use crate::propchain_crowdfunding::{CrowdfundingError, RealEstateCrowdfundin
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     #[allow(unused_imports)]
     use ink::env::{test, DefaultEnvironment};
     use propchain_crowdfunding::{CampaignStatus, CrowdfundingError, RealEstateCrowdfunding};
 
+    use super::*;
+
     fn setup() -> RealEstateCrowdfunding {
         let accounts = test::default_accounts::<DefaultEnvironment>();
         test::set_caller::<DefaultEnvironment>(accounts.alice);
diff --git a/contracts/dex/src/lib.rs b/contracts/dex/src/lib.rs
index 5215c4634..110efee12 100644
--- a/contracts/dex/src/lib.rs
+++ b/contracts/dex/src/lib.rs
@@ -6,15 +6,17 @@
     clippy::needless_borrows_for_generic_args
 )]
 
-use ink::prelude::{string::String, vec::Vec};
+use ink::prelude::string::String;
+use ink::prelude::vec::Vec;
 use ink::storage::Mapping;
 use propchain_traits::*;
 
 #[ink::contract]
 mod dex {
-    use super::*;
     use propchain_traits::{non_reentrant, ReentrancyError, ReentrancyGuard};
 
+    use super::*;
+
     const BIPS_DENOMINATOR: u128 = 10_000;
     const REWARD_PRECISION: u128 = 1_000_000_000;
 
diff --git a/contracts/factory/src/tests.rs b/contracts/factory/src/tests.rs
index 58a474b92..5e2a8782d 100644
--- a/contracts/factory/src/tests.rs
+++ b/contracts/factory/src/tests.rs
@@ -1,7 +1,8 @@
-use crate::contract_factory::*;
 use ink::env::test;
 use ink::primitives::Hash;
 
+use crate::contract_factory::*;
+
 #[ink::test]
 fn test_factory_initialization() {
     let factory = ContractFactory::new();
diff --git a/contracts/fractional/src/lib.rs b/contracts/fractional/src/lib.rs
index c5385e66b..96e0202d2 100644
--- a/contracts/fractional/src/lib.rs
+++ b/contracts/fractional/src/lib.rs
@@ -10,8 +10,7 @@
 mod fractional {
     use ink::prelude::vec::Vec;
     use ink::storage::Mapping;
-    use propchain_traits;
-    use propchain_traits::{non_reentrant, ReentrancyError, ReentrancyGuard};
+    use propchain_traits::{self, non_reentrant, ReentrancyError, ReentrancyGuard};
 
     #[derive(
         Debug,
@@ -1196,9 +1195,10 @@ mod fractional {
 
     #[cfg(test)]
     mod tests {
-        use super::*;
         use ink::env::test;
 
+        use super::*;
+
         fn alice() -> AccountId {
             test::default_accounts::<ink::env::DefaultEnvironment>().alice
         }
@@ -1894,9 +1894,10 @@ mod fractional {
 
     #[cfg(test)]
     mod fractional_admin_rotation_tests {
-        use super::*;
         use ink::env::{test, DefaultEnvironment};
 
+        use super::*;
+
         fn setup() -> Fractional {
             let accounts = test::default_accounts::<DefaultEnvironment>();
             test::set_caller::<DefaultEnvironment>(accounts.alice);
diff --git a/contracts/hello-world/src/test.rs b/contracts/hello-world/src/test.rs
index ec9cea2a6..3453e8296 100644
--- a/contracts/hello-world/src/test.rs
+++ b/contracts/hello-world/src/test.rs
@@ -1,9 +1,10 @@
 #![cfg(test)]
 #![allow(dead_code, unused_imports, deprecated)]
 
-use super::*;
 use soroban_sdk::Env;
 
+use super::*;
+
 #[test]
 fn test_loan_lifecycle() {
     let env = Env::default();
diff --git a/contracts/insurance/src/lib.rs b/contracts/insurance/src/lib.rs
index fad01f2af..ade987a7a 100644
--- a/contracts/insurance/src/lib.rs
+++ b/contracts/insurance/src/lib.rs
@@ -25,10 +25,12 @@ mod fraud_detection;
 /// Decentralized Property Insurance Platform
 #[ink::contract]
 mod propchain_insurance {
-    use super::*;
-    use ink::prelude::{string::String, vec::Vec};
+    use ink::prelude::string::String;
+    use ink::prelude::vec::Vec;
     use propchain_traits::{non_reentrant, ReentrancyError, ReentrancyGuard};
 
+    use super::*;
+
     // Error types extracted to errors.rs (Issue #101)
     include!("errors.rs");
 
@@ -84,10 +86,9 @@ mod propchain_insurance {
     }
 
     // Risk Assessment Model (Task #254)
-    use crate::risk_assessment::risk_model;
-
     // Fraud Detection System (Task #258)
     use crate::fraud_detection::fraud_detection;
+    use crate::risk_assessment::risk_model;
     // Premium calculation engine
     include!("premium_engine.rs");
 
diff --git a/contracts/insurance/src/tests.rs b/contracts/insurance/src/tests.rs
index 183cd8ba1..78992c35f 100644
--- a/contracts/insurance/src/tests.rs
+++ b/contracts/insurance/src/tests.rs
@@ -18,10 +18,11 @@
 // ============================================================================
 #[cfg(test)]
 mod reinsurance_stats_derives {
+    use ink::env::{test, DefaultEnvironment};
+
     use crate::propchain_insurance::{
         CoverageType, PropertyInsurance, ReinsuranceStats, ReinsuranceTreatyType,
     };
-    use ink::env::{test, DefaultEnvironment};
 
     fn setup() -> PropertyInsurance {
         let accounts = test::default_accounts::<DefaultEnvironment>();
@@ -1701,9 +1702,10 @@ mod insurance_tests {
 
 #[cfg(test)]
 mod circuit_breaker_tests {
-    use crate::propchain_insurance::{CoverageType, InsuranceError, PropertyInsurance};
     use ink::env::{test, DefaultEnvironment};
 
+    use crate::propchain_insurance::{CoverageType, InsuranceError, PropertyInsurance};
+
     fn setup_with_pool() -> (PropertyInsurance, u64) {
         let accounts = test::default_accounts::<DefaultEnvironment>();
         test::set_caller::<DefaultEnvironment>(accounts.alice);
@@ -1797,9 +1799,10 @@ mod circuit_breaker_tests {
 
 #[cfg(test)]
 mod insurance_admin_rotation_tests {
-    use crate::propchain_insurance::{InsuranceError, PropertyInsurance};
     use ink::env::{test, DefaultEnvironment};
 
+    use crate::propchain_insurance::{InsuranceError, PropertyInsurance};
+
     fn setup() -> PropertyInsurance {
         let accounts = test::default_accounts::<DefaultEnvironment>();
         test::set_caller::<DefaultEnvironment>(accounts.alice);
diff --git a/contracts/lending/src/lib.rs b/contracts/lending/src/lib.rs
index 3691bc3a6..f1c76103a 100644
--- a/contracts/lending/src/lib.rs
+++ b/contracts/lending/src/lib.rs
@@ -12,8 +12,10 @@ mod status_packing;
 
 #[ink::contract]
 mod propchain_lending {
+    use ink::prelude::string::String;
+    use ink::prelude::vec::Vec;
+
     use super::*;
-    use ink::prelude::{string::String, vec::Vec};
 
     #[derive(Debug, PartialEq, Eq, scale::Encode, scale::Decode)]
     #[cfg_attr(feature = "std", derive(scale_info::TypeInfo))]
@@ -2149,10 +2151,11 @@ pub use crate::propchain_lending::{
 /// when a bug fix requires a regression guard.
 #[cfg(test)]
 mod tests {
-    use super::*;
     use ink::env::{test, DefaultEnvironment};
     use propchain_lending::PropertyLending;
 
+    use super::*;
+
     fn setup() -> PropertyLending {
         let accounts = test::default_accounts::<DefaultEnvironment>();
         test::set_caller::<DefaultEnvironment>(accounts.alice);
@@ -2603,9 +2606,10 @@ mod tests {
 /// caller permutations) does not add noise to general lending tests.
 #[cfg(test)]
 mod lending_admin_rotation_tests {
-    use super::propchain_lending::{LendingError, PropertyLending};
     use ink::env::{test, DefaultEnvironment};
 
+    use super::propchain_lending::{LendingError, PropertyLending};
+
     fn setup() -> PropertyLending {
         let accounts = test::default_accounts::<DefaultEnvironment>();
         test::set_caller::<DefaultEnvironment>(accounts.alice);
@@ -2708,12 +2712,13 @@ mod lending_admin_rotation_tests {
 /// these tests is entirely in the type-checker.
 #[cfg(test)]
 mod storage_derivation_tests {
+    use scale::{Decode, Encode};
+
     use super::propchain_lending::{
         CollateralKind, CollateralRecord, CreditProfile, LendingPool, LoanApplication, LoanListing,
         LoanOffer, LoanRestructuring, LoanServicer, LoanStatus, MarginPosition, PaymentSchedule,
         PaymentScheduleStatus, PropertyLending, Proposal, YieldPosition,
     };
-    use scale::{Decode, Encode};
 
     fn assert_storage_type<
         T: Encode + Decode + scale_info::TypeInfo + ink::storage::traits::StorageLayout,
diff --git a/contracts/lending/src/test.rs b/contracts/lending/src/test.rs
index 1c5723b8c..3a03e7b6f 100644
--- a/contracts/lending/src/test.rs
+++ b/contracts/lending/src/test.rs
@@ -1,12 +1,11 @@
 #![allow(clippy::duplicated_attributes)]
 #![cfg(test)]
 
-use super::*;
-use crate::propchain_lending::CollateralKind;
-use crate::propchain_lending::PaymentScheduleStatus;
-use crate::propchain_lending::Schedule;
 use ink::env::{test, DefaultEnvironment};
 
+use super::*;
+use crate::propchain_lending::{CollateralKind, PaymentScheduleStatus, Schedule};
+
 #[ink::test]
 fn test_loan_interest_accrual_is_jit_only_on_loan_modification() {
     let accounts = test::default_accounts::<DefaultEnvironment>();
diff --git a/contracts/lib/src/lib.rs b/contracts/lib/src/lib.rs
index 82b7488df..22a8cbe3d 100644
--- a/contracts/lib/src/lib.rs
+++ b/contracts/lib/src/lib.rs
@@ -11,16 +11,13 @@
 use ink::prelude::string::String;
 use ink::prelude::vec::Vec;
 use ink::storage::Mapping;
-
+// Import identity module
+use propchain_identity::propchain_identity::IdentityRegistryRef;
 // Re-export traits
 pub use propchain_traits::*;
-
 // Re-export reentrancy protection
 pub use reentrancy_guard::{ReentrancyError, ReentrancyGuard};
 
-// Import identity module
-use propchain_identity::propchain_identity::IdentityRegistryRef;
-
 // Export error handling utilities
 #[cfg(feature = "std")]
 pub mod error_handling;
@@ -4641,10 +4638,11 @@ pub mod propchain_contracts {
 
 #[cfg(test)]
 mod tests_pause {
-    use super::propchain_contracts::{Error, ExternalDependency, PropertyRegistry};
     use ink::primitives::AccountId;
     use propchain_traits::PropertyMetadata;
 
+    use super::propchain_contracts::{Error, ExternalDependency, PropertyRegistry};
+
     #[ink::test]
     fn test_pause_resume_flow() {
         let mut contract = PropertyRegistry::new();
diff --git a/contracts/mock-oracle/src/lib.rs b/contracts/mock-oracle/src/lib.rs
index b4306d844..77784f471 100644
--- a/contracts/mock-oracle/src/lib.rs
+++ b/contracts/mock-oracle/src/lib.rs
@@ -518,9 +518,9 @@ mod mock_oracle_contract {
 
     #[cfg(test)]
     mod tests {
+        use ink::env::{test, DefaultEnvironment};
+
         use super::*;
-        use ink::env::test;
-        use ink::env::DefaultEnvironment;
 
         fn setup() -> MockOracle {
             let accounts = test::default_accounts::<DefaultEnvironment>();
diff --git a/contracts/multicall/src/lib.rs b/contracts/multicall/src/lib.rs
index 85a8ba03f..a3bcc994e 100644
--- a/contracts/multicall/src/lib.rs
+++ b/contracts/multicall/src/lib.rs
@@ -274,9 +274,9 @@ mod propchain_multicall {
 
     #[cfg(test)]
     mod tests {
+        use ink::env::{test, DefaultEnvironment};
+
         use super::*;
-        use ink::env::test;
-        use ink::env::DefaultEnvironment;
 
         fn setup() -> MulticallContract {
             let accounts = test::default_accounts::<DefaultEnvironment>();
diff --git a/contracts/oracle/src/lib.rs b/contracts/oracle/src/lib.rs
index f4d36f783..0926e9c02 100644
--- a/contracts/oracle/src/lib.rs
+++ b/contracts/oracle/src/lib.rs
@@ -26,10 +26,8 @@ mod aggregation;
 mod propchain_oracle {
     use super::*;
     include!("types.rs");
-    use ink::prelude::{
-        string::{String, ToString},
-        vec::Vec,
-    };
+    use ink::prelude::string::{String, ToString};
+    use ink::prelude::vec::Vec;
 
     /// Aggregation mode used when combining prices from multiple oracle sources.
     #[derive(
diff --git a/contracts/property-management/src/lib.rs b/contracts/property-management/src/lib.rs
index 58c2a0772..5ecf40153 100644
--- a/contracts/property-management/src/lib.rs
+++ b/contracts/property-management/src/lib.rs
@@ -1338,9 +1338,10 @@ mod property_management {
 
     #[cfg(test)]
     mod tests {
-        use super::*;
         use ink::env::{test, DefaultEnvironment};
 
+        use super::*;
+
         fn setup() -> PropertyManagement {
             PropertyManagement::new()
         }
diff --git a/contracts/traits/src/admin_multisig.rs b/contracts/traits/src/admin_multisig.rs
index 2db2643dc..f0794681e 100644
--- a/contracts/traits/src/admin_multisig.rs
+++ b/contracts/traits/src/admin_multisig.rs
@@ -1,6 +1,7 @@
-use crate::AccountId;
 use ink::prelude::vec::Vec;
 
+use crate::AccountId;
+
 pub trait MultiSigAdminRotationTrait {
     fn confirm_key_rotation(&mut self, approvals: Vec<AccountId>) -> Result<(), &'static str>;
 }
diff --git a/contracts/traits/src/bridge.rs b/contracts/traits/src/bridge.rs
index dc5161f42..478d70609 100644
--- a/contracts/traits/src/bridge.rs
+++ b/contracts/traits/src/bridge.rs
@@ -3,11 +3,12 @@
 //! This module contains all bridge-related types, status enums, configuration
 //! structures, and trait definitions for cross-chain property token bridging.
 
-use crate::property::{ChainId, PropertyMetadata, TokenId};
 use ink::prelude::string::String;
 use ink::prelude::vec::Vec;
 use ink::primitives::AccountId;
 
+use crate::property::{ChainId, PropertyMetadata, TokenId};
+
 // =========================================================================
 // Data Types
 // =========================================================================
diff --git a/contracts/traits/src/dex.rs b/contracts/traits/src/dex.rs
index f135a443e..5914c314c 100644
--- a/contracts/traits/src/dex.rs
+++ b/contracts/traits/src/dex.rs
@@ -3,12 +3,13 @@
 //! This module contains all types related to the decentralized exchange,
 //! order book, liquidity pools, governance, and cross-chain trading.
 
-use crate::bridge::BridgeFeeQuote;
-use crate::property::{ChainId, TokenId};
 use ink::prelude::string::String;
 use ink::prelude::vec::Vec;
 use ink::primitives::AccountId;
 
+use crate::bridge::BridgeFeeQuote;
+use crate::property::{ChainId, TokenId};
+
 // =========================================================================
 // Order and Trading Types
 // =========================================================================
diff --git a/contracts/traits/src/errors.rs b/contracts/traits/src/errors.rs
index 602924937..45a7f4129 100644
--- a/contracts/traits/src/errors.rs
+++ b/contracts/traits/src/errors.rs
@@ -10,8 +10,8 @@
 //! - [`ContractError::error_i18n_key()`]: default method returning a localization key
 
 use core::fmt;
-use scale::{Decode, Encode};
 
+use scale::{Decode, Encode};
 #[cfg(feature = "std")]
 use scale_info::TypeInfo;
 
diff --git a/contracts/traits/src/event_bus.rs b/contracts/traits/src/event_bus.rs
index e5b2b16c3..7950a9ea5 100644
--- a/contracts/traits/src/event_bus.rs
+++ b/contracts/traits/src/event_bus.rs
@@ -1,9 +1,9 @@
 #![allow(clippy::module_name_repetitions)]
 
 use core::fmt;
+
 use ink::prelude::vec::Vec;
 use scale::{Decode, Encode};
-
 #[cfg(feature = "std")]
 use scale_info::TypeInfo;
 
diff --git a/contracts/traits/src/i18n.rs b/contracts/traits/src/i18n.rs
index d6e3f1535..3521377e4 100644
--- a/contracts/traits/src/i18n.rs
+++ b/contracts/traits/src/i18n.rs
@@ -15,7 +15,6 @@
 //!    inside each key's match block, following the English arm as the template.
 
 use scale::{Decode, Encode};
-
 #[cfg(feature = "std")]
 use scale_info::TypeInfo;
 
diff --git a/contracts/traits/src/lib.rs b/contracts/traits/src/lib.rs
index 84614a42e..252bf3184 100644
--- a/contracts/traits/src/lib.rs
+++ b/contracts/traits/src/lib.rs
@@ -12,12 +12,11 @@ pub mod randomness;
 pub mod reentrancy_guard;
 
 pub mod types;
-pub use types::*;
-
 pub use access_control::*;
 pub use crypto::*;
 pub use di::*;
 pub use reentrancy_guard::*;
+pub use types::*;
 pub mod i18n;
 pub mod monitoring;
 pub mod property_token_metadata;
@@ -41,23 +40,20 @@ pub mod property;
 // =========================================================================
 
 // Original re-exports
-pub use errors::*;
-pub use i18n::*;
-pub use monitoring::*;
-
 // Re-export all new module contents at the crate root so that
 // existing `use propchain_traits::*` continues to resolve every type.
 pub use bridge::*;
-pub use dex::*;
-pub use oracle::*;
-pub use property::*;
-
 // Re-export compliance and fee module contents (types are defined in those modules)
 pub use compliance::*;
+pub use dex::*;
+pub use errors::*;
 pub use event_bus::*;
 pub use fee::*;
+pub use i18n::*;
+pub use monitoring::*;
 pub use multicall::*;
-
+pub use oracle::*;
+pub use property::*;
 #[cfg(not(feature = "std"))]
 use scale_info::prelude::vec::Vec;
 
diff --git a/contracts/traits/src/monitoring.rs b/contracts/traits/src/monitoring.rs
index 430bdd705..7d6c0d4a9 100644
--- a/contracts/traits/src/monitoring.rs
+++ b/contracts/traits/src/monitoring.rs
@@ -1,7 +1,7 @@
 use core::fmt;
+
 use ink::prelude::vec::Vec;
 use scale::{Decode, Encode};
-
 #[cfg(feature = "std")]
 use scale_info::TypeInfo;
 
diff --git a/contracts/traits/src/multicall.rs b/contracts/traits/src/multicall.rs
index f267f6941..70592e303 100644
--- a/contracts/traits/src/multicall.rs
+++ b/contracts/traits/src/multicall.rs
@@ -157,9 +157,10 @@ pub fn aggregate_verifications(
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use ink::primitives::AccountId;
 
+    use super::*;
+
     #[test]
     fn selectors_are_distinct_across_kinds() {
         let kinds = [
diff --git a/contracts/traits/src/oracle.rs b/contracts/traits/src/oracle.rs
index 4cf8579aa..8d07755d3 100644
--- a/contracts/traits/src/oracle.rs
+++ b/contracts/traits/src/oracle.rs
@@ -4,12 +4,13 @@
 //! definitions used across the PropChain ecosystem for property valuations,
 //! price feeds, and market analysis.
 
-use crate::errors::{ContractError, ErrorCategory};
-use crate::property::PropertyType;
 use ink::prelude::string::String;
 use ink::prelude::vec::Vec;
 use ink::primitives::AccountId;
 
+use crate::errors::{ContractError, ErrorCategory};
+use crate::property::PropertyType;
+
 // =========================================================================
 // Error Types
 // =========================================================================
diff --git a/contracts/traits/src/property.rs b/contracts/traits/src/property.rs
index 7f3e589ab..6cd52ee01 100644
--- a/contracts/traits/src/property.rs
+++ b/contracts/traits/src/property.rs
@@ -3,11 +3,12 @@
 //! This module contains the core property-related types, metadata structures,
 //! and trait definitions for property registration, escrow, and management.
 
-use crate::compliance::Jurisdiction;
 use ink::prelude::string::String;
 use ink::prelude::vec::Vec;
 use ink::primitives::AccountId;
 
+use crate::compliance::Jurisdiction;
+
 // =========================================================================
 // Data Types
 // =========================================================================
diff --git a/contracts/version-registry/src/lib.rs b/contracts/version-registry/src/lib.rs
index f4d389b72..f74231aed 100644
--- a/contracts/version-registry/src/lib.rs
+++ b/contracts/version-registry/src/lib.rs
@@ -270,9 +270,10 @@ mod version_registry {
 
     #[cfg(test)]
     mod tests {
-        use super::*;
         use ink::env::test;
 
+        use super::*;
+
         fn default_registry() -> VersionRegistry {
             VersionRegistry::new()
         }
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 000000000..09871c659
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,8 @@
+# Pins the nightly toolchain so that `format_macro_matchers` and other
+# nightly-only rustfmt options work consistently across all contributors
+# and in CI.  The `rustfmt` component is listed explicitly so that
+# `cargo fmt` resolves to the nightly formatter regardless of any system
+# default.
+[toolchain]
+channel = "nightly"
+components = ["rustfmt", "clippy"]
diff --git a/security-audit/src/main.rs b/security-audit/src/main.rs
index c6795391e..222967547 100644
--- a/security-audit/src/main.rs
+++ b/security-audit/src/main.rs
@@ -1,9 +1,10 @@
+use std::fs;
+use std::process::Command;
+
 use anyhow::{Context, Result};
 use clap::{Parser, Subcommand};
 use colored::*;
 use serde::{Deserialize, Serialize};
-use std::fs;
-use std::process::Command;
 use walkdir::WalkDir;
 
 #[derive(Parser)]