diff --git a/crates/gateway/src/compilation.rs b/crates/gateway/src/compilation.rs
index e1c4ea213..2eaf81017 100644
--- a/crates/gateway/src/compilation.rs
+++ b/crates/gateway/src/compilation.rs
@@ -1,10 +1,7 @@
 use std::panic;
-use std::sync::OnceLock;
 
 use blockifier::execution::contract_class::{ClassInfo, ContractClass, ContractClassV1};
-use cairo_lang_starknet_classes::casm_contract_class::{
-    CasmContractClass, CasmContractEntryPoints,
-};
+use cairo_lang_starknet_classes::casm_contract_class::CasmContractClass;
 use cairo_lang_starknet_classes::contract_class::ContractClass as CairoLangContractClass;
 use starknet_api::core::CompiledClassHash;
 use starknet_api::rpc_transaction::RPCDeclareTransaction;
@@ -14,7 +11,6 @@ use starknet_sierra_compile::utils::into_contract_class_for_compilation;
 
 use crate::config::GatewayCompilerConfig;
 use crate::errors::{GatewayError, GatewayResult};
-use crate::utils::is_subsequence;
 
 #[cfg(test)]
 #[path = "compilation_test.rs"]
@@ -42,7 +38,6 @@ impl GatewayCompiler {
         let casm_contract_class = self.compile(cairo_lang_contract_class)?;
 
         validate_compiled_class_hash(&casm_contract_class, &tx.compiled_class_hash)?;
-        validate_casm_class(&casm_contract_class)?;
 
         Ok(ClassInfo::new(
             &ContractClass::V1(ContractClassV1::try_from(casm_contract_class)?),
@@ -65,37 +60,6 @@ impl GatewayCompiler {
     }
 }
 
-// TODO(Arni): Add test.
-fn validate_casm_class(contract_class: &CasmContractClass) -> Result<(), GatewayError> {
-    let CasmContractEntryPoints { external, l1_handler, constructor } =
-        &contract_class.entry_points_by_type;
-    let entry_points_iterator = external.iter().chain(l1_handler.iter()).chain(constructor.iter());
-
-    for entry_point in entry_points_iterator {
-        let builtins = &entry_point.builtins;
-        if !is_subsequence(builtins, supported_builtins()) {
-            return Err(GatewayError::UnsupportedBuiltins {
-                builtins: builtins.clone(),
-                supported_builtins: supported_builtins().to_vec(),
-            });
-        }
-    }
-    Ok(())
-}
-
-// TODO(Arni): Add to a config.
-// TODO(Arni): Use the Builtin enum from Starknet-api, and explicitly tag each builtin as supported
-// or unsupported so that the compiler would alert us on new builtins.
-fn supported_builtins() -> &'static Vec<String> {
-    static SUPPORTED_BUILTINS: OnceLock<Vec<String>> = OnceLock::new();
-    SUPPORTED_BUILTINS.get_or_init(|| {
-        // The OS expects this order for the builtins.
-        const SUPPORTED_BUILTIN_NAMES: [&str; 7] =
-            ["pedersen", "range_check", "ecdsa", "bitwise", "ec_op", "poseidon", "segment_arena"];
-        SUPPORTED_BUILTIN_NAMES.iter().map(|builtin| builtin.to_string()).collect::<Vec<String>>()
-    })
-}
-
 /// Validates that the compiled class hash of the compiled contract class matches the supplied
 /// compiled class hash.
 fn validate_compiled_class_hash(
diff --git a/crates/gateway/src/utils.rs b/crates/gateway/src/utils.rs
index 10af93406..64040f64e 100644
--- a/crates/gateway/src/utils.rs
+++ b/crates/gateway/src/utils.rs
@@ -17,10 +17,6 @@ use starknet_mempool_types::mempool_types::ThinTransaction;
 
 use crate::errors::StatefulTransactionValidatorResult;
 
-#[cfg(test)]
-#[path = "utils_test.rs"]
-mod utils_test;
-
 macro_rules! implement_ref_getters {
     ($(($member_name:ident, $member_type:ty));* $(;)?) => {
         $(fn $member_name(&self) -> &$member_type {
@@ -160,20 +156,3 @@ pub fn get_tx_hash(tx: &AccountTransaction) -> TransactionHash {
         AccountTransaction::Invoke(tx) => tx.tx_hash,
     }
 }
-
-/// Checks whether 'subsequence' is a subsequence of 'sequence'.
-pub fn is_subsequence<T: Eq>(subsequence: &[T], sequence: &[T]) -> bool {
-    let mut offset = 0;
-
-    for item in sequence {
-        if offset == subsequence.len() {
-            return true;
-        }
-
-        if item == &subsequence[offset] {
-            offset += 1;
-        }
-    }
-
-    offset == subsequence.len()
-}
diff --git a/crates/gateway/src/utils_test.rs b/crates/gateway/src/utils_test.rs
deleted file mode 100644
index 7b9d2fdb9..000000000
--- a/crates/gateway/src/utils_test.rs
+++ /dev/null
@@ -1,78 +0,0 @@
-use pretty_assertions::assert_eq;
-use rstest::rstest;
-
-use crate::utils::is_subsequence;
-
-#[rstest]
-#[case::empty(
-    &[],
-    &[],
-    true
-)]
-#[case::empty_subsequence(
-    &[],
-    &["a", "b"],
-    true
-)]
-#[case::empty_sequence(
-    &["a"],
-    &[],
-    false
-)]
-#[case::subsequence_1(
-    &["a"],
-    &["a", "b", "c"],
-    true
-)]
-#[case::subsequence_2(
-    &["b"],
-    &["a", "b", "c"],
-    true
-)]
-#[case::subsequence_3(
-    &["c"],
-    &["a", "b", "c"],
-    true
-)]
-#[case::subsequence_4(
-    &["a", "b"],
-    &["a", "b", "c"],
-    true
-)]
-#[case::subsequence_5(
-    &["a", "c"],
-    &["a", "b", "c"],
-    true
-)]
-#[case::subsequence_6(
-    &["b", "c"],
-    &["a", "b", "c"],
-    true
-)]
-#[case::subsequence_7(
-    &["a", "b", "c"],
-    &["a", "b", "c"],
-    true
-)]
-#[case::out_of_order_1(
-    &["b", "a"],
-    &["a", "b", "c"],
-    false
-)]
-#[case::out_of_order_2(
-    &["b", "a", "c"],
-    &["a", "b", "c"],
-    false
-)]
-#[case::unrelated(
-    &["a", "b", "d"],
-    &["a", "b", "c"],
-    false
-)]
-fn test_is_subsequence(
-    #[case] subsequence: &[&str],
-    #[case] sequence: &[&str],
-    #[case] expected_result: bool,
-) {
-    assert_eq!(is_subsequence(subsequence, sequence), expected_result);
-}