diff --git a/noir-projects/noir-contracts/contracts/crowdfunding_contract/src/main.nr b/noir-projects/noir-contracts/contracts/crowdfunding_contract/src/main.nr
index f2ff913076a..010bd593b5e 100644
--- a/noir-projects/noir-contracts/contracts/crowdfunding_contract/src/main.nr
+++ b/noir-projects/noir-contracts/contracts/crowdfunding_contract/src/main.nr
@@ -27,8 +27,7 @@ contract Crowdfunding {
         // Crowdfunding campaign operator
         operator: SharedImmutable<AztecAddress>,
         // End of the crowdfunding campaign after which no more donations are accepted
-        // TODO(#4990): Make deadline a u64 once the neccessary traits are implemented
-        deadline: PublicImmutable<Field>,
+        deadline: PublicImmutable<u64>,
         // Notes emitted to donors when they donate (later on used to claim rewards in the Claim contract)
         claim_notes: PrivateSet<ValueNote>,
     }
@@ -36,17 +35,15 @@ contract Crowdfunding {
     #[aztec(public)]
     #[aztec(initializer)]
     fn constructor(donation_token: AztecAddress, operator: AztecAddress, deadline: u64) {
-        // TODO(#4990): Make deadline a u64 once the neccessary traits are implemented
         storage.donation_token.initialize(donation_token);
         storage.operator.initialize(operator);
-        storage.deadline.initialize(deadline as Field);
+        storage.deadline.initialize(deadline);
     }
 
     #[aztec(public)]
     #[aztec(internal)]
     fn _check_deadline() {
-        // TODO(#4990): Remove the cast here once u64 is used directly
-        let deadline = storage.deadline.read() as u64;
+        let deadline = storage.deadline.read();
         assert(context.timestamp() as u64 < deadline, "Deadline has passed");
     }
 
diff --git a/noir-projects/noir-protocol-circuits/crates/types/src/type_serialization.nr b/noir-projects/noir-protocol-circuits/crates/types/src/type_serialization.nr
index 9b4929fc63d..e7aac333e59 100644
--- a/noir-projects/noir-protocol-circuits/crates/types/src/type_serialization.nr
+++ b/noir-projects/noir-protocol-circuits/crates/types/src/type_serialization.nr
@@ -1,19 +1,21 @@
 use crate::traits::{Serialize, Deserialize};
 
 global BOOL_SERIALIZED_LEN: Field = 1;
-global U32_SERIALIZED_LEN: Field = 1;
 global U8_SERIALIZED_LEN: Field = 1;
+global U32_SERIALIZED_LEN: Field = 1;
+global U64_SERIALIZED_LEN: Field = 1;
+global U128_SERIALIZED_LEN: Field = 1;
 global FIELD_SERIALIZED_LEN: Field = 1;
 
-impl Serialize<U32_SERIALIZED_LEN> for u32 {
-    fn serialize(self) -> [Field; U32_SERIALIZED_LEN] {
+impl Serialize<BOOL_SERIALIZED_LEN> for bool {
+    fn serialize(self) -> [Field; BOOL_SERIALIZED_LEN] {
         [self as Field]
     }
 }
 
-impl Deserialize<U32_SERIALIZED_LEN> for u32 {
-    fn deserialize(fields: [Field; U32_SERIALIZED_LEN]) -> Self {
-        fields[0] as u32
+impl Deserialize<BOOL_SERIALIZED_LEN> for bool {
+    fn deserialize(fields: [Field; BOOL_SERIALIZED_LEN]) -> bool {
+        fields[0] as bool
     }
 }
 
@@ -29,39 +31,51 @@ impl Deserialize<U8_SERIALIZED_LEN> for u8 {
     }
 }
 
-impl Serialize<FIELD_SERIALIZED_LEN> for Field {
+impl Serialize<U32_SERIALIZED_LEN> for u32 {
     fn serialize(self) -> [Field; U32_SERIALIZED_LEN] {
-        [self]
+        [self as Field]
     }
 }
 
-impl Deserialize<FIELD_SERIALIZED_LEN> for Field {
-    fn deserialize(fields: [Field; FIELD_SERIALIZED_LEN]) -> Self {
-        fields[0]
+impl Deserialize<U32_SERIALIZED_LEN> for u32 {
+    fn deserialize(fields: [Field; U32_SERIALIZED_LEN]) -> Self {
+        fields[0] as u32
     }
 }
 
-impl Serialize<BOOL_SERIALIZED_LEN> for bool {
-    fn serialize(self) -> [Field; BOOL_SERIALIZED_LEN] {
+impl Serialize<U64_SERIALIZED_LEN> for u64 {
+    fn serialize(self) -> [Field; U64_SERIALIZED_LEN] {
         [self as Field]
     }
 }
 
-impl Deserialize<BOOL_SERIALIZED_LEN> for bool {
-    fn deserialize(fields: [Field; BOOL_SERIALIZED_LEN]) -> bool {
-        fields[0] as bool
+impl Deserialize<U64_SERIALIZED_LEN> for u64 {
+    fn deserialize(fields: [Field; U64_SERIALIZED_LEN]) -> Self {
+        fields[0] as u64
     }
 }
 
-impl Serialize<1> for U128 {
+impl Serialize<U128_SERIALIZED_LEN> for U128 {
     fn serialize(self) -> [Field; 1] {
         [self.to_integer()]
     }
 
 }
 
-impl Deserialize<1> for U128 {
-    fn deserialize(fields: [Field; 1]) -> Self {
+impl Deserialize<U128_SERIALIZED_LEN> for U128 {
+    fn deserialize(fields: [Field; U128_SERIALIZED_LEN]) -> Self {
         U128::from_integer(fields[0])
     }
 }
+
+impl Serialize<FIELD_SERIALIZED_LEN> for Field {
+    fn serialize(self) -> [Field; U32_SERIALIZED_LEN] {
+        [self]
+    }
+}
+
+impl Deserialize<FIELD_SERIALIZED_LEN> for Field {
+    fn deserialize(fields: [Field; FIELD_SERIALIZED_LEN]) -> Self {
+        fields[0]
+    }
+}