diff --git a/crates/aiken-lang/Cargo.toml b/crates/aiken-lang/Cargo.toml
index 7838370f..8a3152f2 100644
--- a/crates/aiken-lang/Cargo.toml
+++ b/crates/aiken-lang/Cargo.toml
@@ -14,7 +14,6 @@ authors = [
 rust-version = "1.66.1"
 
 [dependencies]
-chumsky = "0.9.2"
 hex = "0.4.3"
 indexmap = "1.9.2"
 indoc = "2.0.1"
@@ -25,9 +24,13 @@ owo-colors = { version = "3.5.0", features = ["supports-colors"] }
 strum = "0.24.1"
 thiserror = "1.0.39"
 vec1 = "1.10.1"
-
 uplc = { path = '../uplc', version = "1.0.4-alpha" }
 
+[target.'cfg(not(target_family="wasm"))'.dependencies]
+chumsky = "0.9.2"
+[target.'cfg(target_family="wasm")'.dependencies]
+chumsky = { version = "0.9.2", features = ["ahash", "std"], default-features = false }
+
 [dev-dependencies]
 indoc = "2.0.1"
 pretty_assertions = "1.3.0"
diff --git a/crates/uplc/Cargo.toml b/crates/uplc/Cargo.toml
index 7aa14954..b297c748 100644
--- a/crates/uplc/Cargo.toml
+++ b/crates/uplc/Cargo.toml
@@ -16,7 +16,6 @@ cryptoxide = "0.4.4"
 hex = "0.4.3"
 indexmap = "1.9.2"
 itertools = "0.10.5"
-k256 = { version = "0.13.0", optional = true }
 miette = "5.5.0"
 num-bigint = "0.4.3"
 num-integer = "0.1.45"
@@ -29,20 +28,18 @@ pallas-traverse = "0.18.0"
 peg = "0.8.1"
 pretty = "0.11.3"
 pretty_assertions = "1.3.0"
-secp256k1 = { version = "0.26.0", optional = true }
 serde = { version = "1.0.152", features = ["derive"] }
 serde_json = "1.0.94"
 strum = "0.24.1"
 strum_macros = "0.24.3"
 thiserror = "1.0.39"
-
 flat-rs = { path = "../flat-rs", version = "1.0.4-alpha" }
 
+[target.'cfg(not(target_family="wasm"))'.dependencies]
+secp256k1 = { version = "0.26.0" }
+[target.'cfg(target_family="wasm")'.dependencies]
+k256 = { version = "0.13.0" }
+
 [dev-dependencies]
 hex = "0.4.3"
 indoc = "2.0.1"
-
-[features]
-default = ["dep:secp256k1"]
-native-secp256k1 = ["dep:k256"]
-unstable = []
diff --git a/crates/uplc/src/machine/error.rs b/crates/uplc/src/machine/error.rs
index 302fcd4d..86dce919 100644
--- a/crates/uplc/src/machine/error.rs
+++ b/crates/uplc/src/machine/error.rs
@@ -50,10 +50,10 @@ pub enum Error {
     DeserialisationError(String, Value),
     #[error("Integer overflow")]
     OverflowError,
-    #[cfg(not(feature = "native-secp256k1"))]
+    #[cfg(not(target_family = "wasm"))]
     #[error(transparent)]
     Secp256k1(#[from] secp256k1::Error),
-    #[cfg(feature = "native-secp256k1")]
+    #[cfg(target_family = "wasm")]
     #[error(transparent)]
     Secp256k1(#[from] k256::ecdsa::Error),
 }
diff --git a/crates/uplc/src/machine/runtime.rs b/crates/uplc/src/machine/runtime.rs
index 51e4644f..43cffa37 100644
--- a/crates/uplc/src/machine/runtime.rs
+++ b/crates/uplc/src/machine/runtime.rs
@@ -1041,7 +1041,7 @@ pub fn convert_constr_to_tag(constr: u64) -> Option<u64> {
 
 pub static ANY_TAG: u64 = 102;
 
-#[cfg(not(feature = "native-secp256k1"))]
+#[cfg(not(target_family = "wasm"))]
 fn verify_ecdsa(public_key: &[u8], message: &[u8], signature: &[u8]) -> Result<Value, Error> {
     use secp256k1::{ecdsa::Signature, Message, PublicKey, Secp256k1};
 
@@ -1060,7 +1060,7 @@ fn verify_ecdsa(public_key: &[u8], message: &[u8], signature: &[u8]) -> Result<V
 
 /// Unlike the Haskell implementation the schnorr verification function in Aiken doesn't allow for arbitrary message sizes (at the moment).
 /// The message needs to be 32 bytes (ideally prehashed, but not a requirement).
-#[cfg(not(feature = "native-secp256k1"))]
+#[cfg(not(target_family = "wasm"))]
 fn verify_schnorr(public_key: &[u8], message: &[u8], signature: &[u8]) -> Result<Value, Error> {
     use secp256k1::{schnorr::Signature, Message, Secp256k1, XOnlyPublicKey};
 
@@ -1077,7 +1077,7 @@ fn verify_schnorr(public_key: &[u8], message: &[u8], signature: &[u8]) -> Result
     Ok(Value::Con(Constant::Bool(valid.is_ok()).into()))
 }
 
-#[cfg(feature = "native-secp256k1")]
+#[cfg(target_family = "wasm")]
 fn verify_ecdsa(public_key: &[u8], message: &[u8], signature: &[u8]) -> Result<Value, Error> {
     use k256::ecdsa::{self, signature::hazmat::PrehashVerifier};
 
@@ -1090,7 +1090,7 @@ fn verify_ecdsa(public_key: &[u8], message: &[u8], signature: &[u8]) -> Result<V
     Ok(Value::Con(Constant::Bool(valid.is_ok()).into()))
 }
 
-#[cfg(feature = "native-secp256k1")]
+#[cfg(target_family = "wasm")]
 fn verify_schnorr(public_key: &[u8], message: &[u8], signature: &[u8]) -> Result<Value, Error> {
     use k256::schnorr::{self, signature::hazmat::PrehashVerifier};