diff --git a/crates/starknet-types-core/Cargo.toml b/crates/starknet-types-core/Cargo.toml
index f07b4a7..b5b4030 100644
--- a/crates/starknet-types-core/Cargo.toml
+++ b/crates/starknet-types-core/Cargo.toml
@@ -42,6 +42,7 @@ hash = ["dep:lambdaworks-crypto"]
 arbitrary = ["std", "dep:arbitrary"]
 serde = ["dep:serde"]
 num-traits = []
+alloc = ["serde?/alloc"]
 
 [dev-dependencies]
 proptest = "1.1.0"
diff --git a/crates/starknet-types-core/src/felt/mod.rs b/crates/starknet-types-core/src/felt/mod.rs
index 5056bf9..f732179 100644
--- a/crates/starknet-types-core/src/felt/mod.rs
+++ b/crates/starknet-types-core/src/felt/mod.rs
@@ -960,8 +960,8 @@ mod errors {
 #[cfg(test)]
 mod test {
     use super::alloc::{format, string::String, vec::Vec};
+    use super::felt_arbitrary::nonzero_felt;
     use super::*;
-    use crate::felt_arbitrary::nonzero_felt;
     use core::ops::Shl;
     use proptest::prelude::*;
     #[cfg(feature = "serde")]
diff --git a/crates/starknet-types-rpc/Cargo.toml b/crates/starknet-types-rpc/Cargo.toml
index 38ae114..4760201 100644
--- a/crates/starknet-types-rpc/Cargo.toml
+++ b/crates/starknet-types-rpc/Cargo.toml
@@ -16,7 +16,7 @@ default = ["std"]
 std = ["serde/std", "starknet-types-core/std"]
 
 [dependencies]
-starknet-types-core = { path = "../starknet-types-core", default-features = false, features = ["serde"] }
+starknet-types-core = { path = "../starknet-types-core", default-features = false, features = ["serde", "alloc"] }
 serde = { version = "1", default-features = false, features = ["derive"] }
 
 [dev-dependencies]
diff --git a/ensure_no_std/Cargo.toml b/ensure_no_std/Cargo.toml
index e18e611..c6291eb 100644
--- a/ensure_no_std/Cargo.toml
+++ b/ensure_no_std/Cargo.toml
@@ -8,6 +8,7 @@ starknet-types-core = { path = "../crates/starknet-types-core", default-features
     "alloc",
     "serde",
     "curve",
+    "num-traits",
 ] }
 starknet-types-rpc = { path = "../crates/starknet-types-rpc", default-features = false }
 wee_alloc = "0.4.5"