diff --git a/README.md b/README.md
index bf564e4c..4171d2e7 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 [![](https://img.shields.io/crates/v/rustfft.svg)](https://crates.io/crates/rustfft)
 [![](https://img.shields.io/crates/l/rustfft.svg)](https://crates.io/crates/rustfft)
 [![](https://docs.rs/rustfft/badge.svg)](https://docs.rs/rustfft/)
-![minimum rustc 1.48](https://img.shields.io/badge/rustc-1.48+-red.svg)
+![minimum rustc 1.37](https://img.shields.io/badge/rustc-1.37+-red.svg)
 
 RustFFT is a high-performance FFT library written in pure Rust. It can compute FFTs of any size, including prime-number sizes, in O(nlogn) time.
 
@@ -28,7 +28,7 @@ fft.process(&mut buffer);
 
 ## Supported Rust Version
 
-RustFFT requires rustc 1.48 or newer. Minor releases of RustFFT may upgrade the MSRV(minimum supported Rust version) to a newer version of rustc.
+RustFFT requires rustc 1.37 or newer. Minor releases of RustFFT may upgrade the MSRV(minimum supported Rust version) to a newer version of rustc.
 However, if we need to increase the MSRV, the new Rust version must have been released at least six months ago.
 
 ## Stability/Future Breaking Changes
diff --git a/src/plan.rs b/src/plan.rs
index bc22f0e9..53eb3e4f 100644
--- a/src/plan.rs
+++ b/src/plan.rs
@@ -99,7 +99,7 @@ const MIN_BLUESTEIN_MIXED_RADIX_LEN: usize = 90; // only use mixed radix for the
 
 /// A Recipe is a structure that describes the design of a FFT, without actually creating it.
 /// It is used as a middle step in the planning process.
-#[derive(Debug, std::cmp::PartialEq, Clone)]
+#[derive(Debug, PartialEq, Clone)]
 pub enum Recipe {
     Dft(usize),
     MixedRadix {
@@ -359,9 +359,6 @@ impl<T: FftNum> FftPlannerScalar<T> {
             if len.is_power_of_two() {
                 Rc::new(Recipe::Radix4(len))
             } else {
-                dbg!(len);
-                dbg!(len.trailing_zeros());
-                dbg!(&factors);
                 let non_power_of_two = factors
                     .remove_factors(PrimeFactor {
                         value: 2,