diff --git a/Cargo.toml b/Cargo.toml
index f62bacf..d821af7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "monarch-butterfly"
-version = "0.3.1"
+version = "0.4.0"
 edition = "2021"
 description = "Proc-Macro unrolled FFTs"
 license = "MIT"
@@ -8,13 +8,13 @@ documentation = "https://docs.rs/monarch-butterfly"
 homepage = "https://github.com/michaelciraci/Monarch-Butterfly"
 repository = "https://github.com/michaelciraci/Monarch-Butterfly"
 rust-version = "1.63"
-keywords = ["fft", "dft", "discrete", "fourier", "transform"]
+keywords = ["fft", "dft", "discrete", "fourier", "transform", "no_std"]
 categories = ["algorithms", "science"]
 
 [dependencies]
-monarch-derive = "=0.3.0"
+monarch-derive = "=0.4.0"
 num-complex = "0.4"
-num-traits = "0.2"
+num-traits = { version = "0.2", default-features = false }
 
 [dev-dependencies]
 rustfft = "6.2.0"
diff --git a/crates/monarch-derive/Cargo.toml b/crates/monarch-derive/Cargo.toml
index acc9a07..fb6464a 100644
--- a/crates/monarch-derive/Cargo.toml
+++ b/crates/monarch-derive/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "monarch-derive"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2021"
 description = "Proc-Macro unrolled FFTs"
 license = "MIT"
diff --git a/crates/monarch-derive/src/lib.rs b/crates/monarch-derive/src/lib.rs
index 3c24702..e47c802 100644
--- a/crates/monarch-derive/src/lib.rs
+++ b/crates/monarch-derive/src/lib.rs
@@ -89,7 +89,7 @@ pub fn generate_switch(_input: TokenStream) -> TokenStream {
         quote! {
             #s => {
                 let x = #func(x_in);
-                std::array::from_fn(|i| x[i])
+                core::array::from_fn(|i| x[i])
              },
         }
     });
@@ -99,7 +99,7 @@ pub fn generate_switch(_input: TokenStream) -> TokenStream {
         quote! {
             #s => {
                 let x = #func(x_in);
-                std::array::from_fn(|i| x[i])
+                core::array::from_fn(|i| x[i])
              },
         }
     });
@@ -120,7 +120,7 @@ pub fn generate_switch(_input: TokenStream) -> TokenStream {
             assert_eq!(x_in.len(), N);
 
             match N {
-                1 => { std::array::from_fn(|i| x_in[i]) },
+                1 => { core::array::from_fn(|i| x_in[i]) },
                 #(#ss_forward)*
                 _ => unimplemented!(),
             }
@@ -141,7 +141,7 @@ pub fn generate_switch(_input: TokenStream) -> TokenStream {
             assert_eq!(x_in.len(), N);
 
             match N {
-                1 => { std::array::from_fn(|i| x_in[i]) },
+                1 => { core::array::from_fn(|i| x_in[i]) },
                 #(#ss_inverse)*
                 _ => unimplemented!(),
             }
diff --git a/src/lib.rs b/src/lib.rs
index 6f21060..5af4997 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -49,6 +49,7 @@
 
 #![allow(clippy::excessive_precision)]
 #![forbid(unsafe_code)]
+#![no_std]
 
 use num_complex::Complex;
 use num_traits::{Float, FloatConst};