diff --git a/Cargo.toml b/Cargo.toml
index 720ebe9c4..a60fe0be0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -59,6 +59,7 @@ unused_peekable = "warn"
 unused_rounding = "warn"
 useless_let_if_seq = "warn"
 use_self = "warn"
+missing_const_for_fn = "warn"
 
 # These are nursery lints which have findings. Allow them for now. Some are not
 # quite mature enough for use in our codebase and some we don't really want.
@@ -71,7 +72,6 @@ empty_line_after_doc_comments = "allow"
 fallible_impl_from = "allow"
 future_not_send = "allow"
 iter_on_single_items = "allow"
-missing_const_for_fn = "allow"
 needless_collect = "allow"
 non_send_fields_in_send_ty = "allow"
 option_if_let_else = "allow"
diff --git a/src/eth_provider/database/mod.rs b/src/eth_provider/database/mod.rs
index 92ba07de4..3639a2feb 100644
--- a/src/eth_provider/database/mod.rs
+++ b/src/eth_provider/database/mod.rs
@@ -28,7 +28,7 @@ impl Database {
     }
 
     /// Get a reference to the inner MongoDatabase
-    pub fn inner(&self) -> &MongoDatabase {
+    pub const fn inner(&self) -> &MongoDatabase {
         &self.0
     }
 
diff --git a/src/eth_provider/database/types/transaction.rs b/src/eth_provider/database/types/transaction.rs
index f9b0421dc..f3c2ac923 100644
--- a/src/eth_provider/database/types/transaction.rs
+++ b/src/eth_provider/database/types/transaction.rs
@@ -72,7 +72,7 @@ pub struct StoredPendingTransaction {
 }
 
 impl StoredPendingTransaction {
-    pub fn new(tx: Transaction, retries: u64) -> Self {
+    pub const fn new(tx: Transaction, retries: u64) -> Self {
         Self { tx, retries }
     }
 }
diff --git a/src/eth_provider/provider.rs b/src/eth_provider/provider.rs
index a223c7702..3c60e4c65 100644
--- a/src/eth_provider/provider.rs
+++ b/src/eth_provider/provider.rs
@@ -146,7 +146,7 @@ where
     SP: starknet::providers::Provider,
 {
     /// Returns a reference to the database.
-    pub fn database(&self) -> &Database {
+    pub const fn database(&self) -> &Database {
         &self.database
     }
 }
@@ -653,7 +653,7 @@ where
     }
 
     #[cfg(feature = "testing")]
-    pub fn starknet_provider(&self) -> &SP {
+    pub const fn starknet_provider(&self) -> &SP {
         &self.starknet_provider
     }
 
diff --git a/src/eth_rpc/middleware/metrics.rs b/src/eth_rpc/middleware/metrics.rs
index cbf2eac47..d1e90cf59 100644
--- a/src/eth_rpc/middleware/metrics.rs
+++ b/src/eth_rpc/middleware/metrics.rs
@@ -106,7 +106,7 @@ pub struct MetricsLayer {
 
 impl MetricsLayer {
     /// Create a new [`MetricsLayer`].
-    pub fn new(metrics: RpcMetrics, transport_label: &'static str) -> Self {
+    pub const fn new(metrics: RpcMetrics, transport_label: &'static str) -> Self {
         Self { inner: metrics, transport_label }
     }
 }
@@ -129,7 +129,7 @@ pub struct Metrics<S> {
 
 impl<S> Metrics<S> {
     /// Create a new metrics middleware.
-    pub fn new(service: S, metrics: RpcMetrics, transport_label: &'static str) -> Self {
+    pub const fn new(service: S, metrics: RpcMetrics, transport_label: &'static str) -> Self {
         Self { service, metrics, transport_label }
     }
 }
diff --git a/src/models/transaction.rs b/src/models/transaction.rs
index 9de35b2e2..d764b5615 100644
--- a/src/models/transaction.rs
+++ b/src/models/transaction.rs
@@ -55,7 +55,7 @@ mod tests {
             self
         }
 
-        fn with_fee_market(mut self) -> Self {
+        const fn with_fee_market(mut self) -> Self {
             self.tx.max_fee_per_gas = Some(30);
             self.tx.max_priority_fee_per_gas = Some(10);
             self
diff --git a/src/test_utils/evm_contract.rs b/src/test_utils/evm_contract.rs
index d0cd544ca..a7e11dbca 100644
--- a/src/test_utils/evm_contract.rs
+++ b/src/test_utils/evm_contract.rs
@@ -20,7 +20,7 @@ pub enum TransactionInfo {
 
 macro_rules! impl_common_info {
     ($field: ident, $type: ty) => {
-        pub fn $field(&self) -> $type {
+        pub const fn $field(&self) -> $type {
             match self {
                 TransactionInfo::FeeMarketInfo(info) => info.common.$field,
                 TransactionInfo::LegacyInfo(info) => info.common.$field,
diff --git a/src/test_utils/katana/genesis.rs b/src/test_utils/katana/genesis.rs
index a4e696ade..68dd400f0 100644
--- a/src/test_utils/katana/genesis.rs
+++ b/src/test_utils/katana/genesis.rs
@@ -344,11 +344,11 @@ impl KatanaGenesisBuilder<Initialized> {
         self.cache.get(key).cloned().ok_or(eyre!("Cache miss for {key} address"))
     }
 
-    pub fn cache(&self) -> &HashMap<String, FieldElement> {
+    pub const fn cache(&self) -> &HashMap<String, FieldElement> {
         &self.cache
     }
 
-    pub fn class_hashes(&self) -> &HashMap<String, FieldElement> {
+    pub const fn class_hashes(&self) -> &HashMap<String, FieldElement> {
         &self.class_hashes
     }
 }
diff --git a/src/test_utils/mongo/mod.rs b/src/test_utils/mongo/mod.rs
index 10250c941..b4f8b878c 100644
--- a/src/test_utils/mongo/mod.rs
+++ b/src/test_utils/mongo/mod.rs
@@ -80,7 +80,7 @@ pub enum StoredData {
 
 impl StoredData {
     /// Extracts the stored header if it exists, otherwise returns None.
-    pub fn extract_stored_header(&self) -> Option<&StoredHeader> {
+    pub const fn extract_stored_header(&self) -> Option<&StoredHeader> {
         match self {
             Self::StoredHeader(header) => Some(header),
             _ => None,
@@ -88,7 +88,7 @@ impl StoredData {
     }
 
     /// Extracts the stored transaction if it exists, otherwise returns None.
-    pub fn extract_stored_transaction(&self) -> Option<&StoredTransaction> {
+    pub const fn extract_stored_transaction(&self) -> Option<&StoredTransaction> {
         match self {
             Self::StoredTransaction(transaction) => Some(transaction),
             _ => None,
@@ -96,7 +96,7 @@ impl StoredData {
     }
 
     /// Extracts the stored transaction receipt if it exists, otherwise returns None.
-    pub fn extract_stored_transaction_receipt(&self) -> Option<&StoredTransactionReceipt> {
+    pub const fn extract_stored_transaction_receipt(&self) -> Option<&StoredTransactionReceipt> {
         match self {
             Self::StoredTransactionReceipt(receipt) => Some(receipt),
             _ => None,
@@ -104,7 +104,7 @@ impl StoredData {
     }
 
     /// Extracts the stored log if it exists, otherwise returns None.
-    pub fn extract_stored_log(&self) -> Option<&StoredLog> {
+    pub const fn extract_stored_log(&self) -> Option<&StoredLog> {
         match self {
             Self::StoredLog(log) => Some(log),
             _ => None,
@@ -167,7 +167,7 @@ impl MongoFuzzer {
     }
 
     /// Obtains an immutable reference to the documents HashMap.
-    pub fn documents(&self) -> &HashMap<CollectionDB, Vec<StoredData>> {
+    pub const fn documents(&self) -> &HashMap<CollectionDB, Vec<StoredData>> {
         &self.documents
     }
 
@@ -178,7 +178,7 @@ impl MongoFuzzer {
     }
 
     /// Get port number
-    pub fn port(&self) -> u16 {
+    pub const fn port(&self) -> u16 {
         self.port
     }
 
@@ -379,7 +379,7 @@ pub struct TransactionBuilder {
 
 impl TransactionBuilder {
     /// Specifies the type of transaction to build.
-    pub fn with_tx_type(mut self, tx_type: TxType) -> Self {
+    pub const fn with_tx_type(mut self, tx_type: TxType) -> Self {
         self.tx_type = Some(tx_type);
         self
     }
diff --git a/src/test_utils/rpc/mod.rs b/src/test_utils/rpc/mod.rs
index ba414cae0..7ffbf9a13 100644
--- a/src/test_utils/rpc/mod.rs
+++ b/src/test_utils/rpc/mod.rs
@@ -110,7 +110,7 @@ impl RawRpcParamsBuilder {
     }
 
     /// Sets the ID for the JSON-RPC request.
-    pub fn set_id(mut self, id: i32) -> Self {
+    pub const fn set_id(mut self, id: i32) -> Self {
         self.id = id;
         self
     }