diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 35064de..f7855d0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
-        rust: [stable]
+        rust: [stable, "1.70"]
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
diff --git a/Cargo.lock b/Cargo.lock
index 064fcbf..1a96e63 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 4
+version = 3
 
 [[package]]
 name = "ahash"
@@ -127,8 +127,8 @@ dependencies = [
  "cudarc",
  "half",
  "num-traits",
- "rand",
- "rand_distr",
+ "rand 0.9.1",
+ "rand_distr 0.5.1",
  "rkyv",
  "serde",
  "zerocopy 0.6.6",
@@ -165,15 +165,15 @@ dependencies = [
 
 [[package]]
 name = "half"
-version = "2.6.0"
+version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "459196ed295495a68f7d7fe1d84f6c4b7ff0e21fe3017b2f283c6fac3ad803c9"
+checksum = "6dd08c532ae367adf81c312a4580bc67f1d0fe8bc9c460520283f4c0ff277888"
 dependencies = [
  "cfg-if",
  "crunchy",
  "num-traits",
- "rand",
- "rand_distr",
+ "rand 0.8.5",
+ "rand_distr 0.4.3",
 ]
 
 [[package]]
@@ -298,6 +298,15 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc33ff2d4973d518d823d61aa239014831e521c75da58e3df4840d3f47749d09"
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "rand_core 0.6.4",
+]
+
 [[package]]
 name = "rand"
 version = "0.9.1"
@@ -305,7 +314,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9fbfd9d094a40bf3ae768db9361049ace4c0e04a4fd6b359518bd7b73a73dd97"
 dependencies = [
  "rand_chacha",
- "rand_core",
+ "rand_core 0.9.3",
 ]
 
 [[package]]
@@ -315,9 +324,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.9.3",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+
 [[package]]
 name = "rand_core"
 version = "0.9.3"
@@ -327,6 +342,16 @@ dependencies = [
  "getrandom 0.3.3",
 ]
 
+[[package]]
+name = "rand_distr"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32cb0b9bc82b0a0876c2dd994a7e7a2683d3e7390ca40e6886785ef0c7e3ee31"
+dependencies = [
+ "num-traits",
+ "rand 0.8.5",
+]
+
 [[package]]
 name = "rand_distr"
 version = "0.5.1"
@@ -334,7 +359,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6a8615d50dcf34fa31f7ab52692afec947c4dd0ab803cc87cb3b0b4570ff7463"
 dependencies = [
  "num-traits",
- "rand",
+ "rand 0.9.1",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index e9190d4..f015551 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "float8"
 version = "0.4.0"
+rust-version = "1.70"
 edition = "2021"
 description = "8-bit floating point types for Rust"
 homepage = "https://github.com/EricLBuehler/float8"
diff --git a/src/lib.rs b/src/lib.rs
index 902b852..544d652 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -110,7 +110,9 @@ enum SaturationType {
 
 // https://gitlab.com/nvidia/headers/cuda-individual/cudart/-/blob/main/cuda_fp8.hpp?ref_type=heads#L97
 const fn convert_to_fp8(x: f64, saturate: SaturationType, fp8_interpretation: Kind) -> u8 {
-    let xbits: u64 = x.to_bits();
+    // TODO: use x.to_bits() with MSRV 1.83
+    #[allow(unknown_lints, unnecessary_transmutes)]
+    let xbits: u64 = unsafe { std::mem::transmute::<f64, u64>(x) };
 
     let (
         fp8_maxnorm,