diff --git a/library/compiler-builtins/libm/crates/libm-test/Cargo.toml b/library/compiler-builtins/libm/crates/libm-test/Cargo.toml
index 137b81464230..31cbf6e68024 100644
--- a/library/compiler-builtins/libm/crates/libm-test/Cargo.toml
+++ b/library/compiler-builtins/libm/crates/libm-test/Cargo.toml
@@ -12,7 +12,7 @@ unstable-float = ["libm/unstable-float", "rug?/nightly-float"]
 
 # Generate tests which are random inputs and the outputs are calculated with
 # musl libc.
-build-mpfr = ["dep:az", "dep:rug", "dep:gmp-mpfr-sys"]
+build-mpfr = ["dep:rug", "dep:gmp-mpfr-sys"]
 
 # Build our own musl for testing and benchmarks
 build-musl = ["dep:musl-math-sys"]
@@ -28,7 +28,6 @@ short-benchmarks = []
 
 [dependencies]
 anyhow = "1.0.95"
-az = { version = "1.2.1", optional = true }
 gmp-mpfr-sys = { version = "1.6.4", optional = true, default-features = false, features = ["mpfr"] }
 iai-callgrind = { version = "0.14.0", optional = true }
 indicatif = { version = "0.17.9", default-features = false }
diff --git a/library/compiler-builtins/libm/crates/libm-test/src/mpfloat.rs b/library/compiler-builtins/libm/crates/libm-test/src/mpfloat.rs
index 98b80505f264..e2be6584d232 100644
--- a/library/compiler-builtins/libm/crates/libm-test/src/mpfloat.rs
+++ b/library/compiler-builtins/libm/crates/libm-test/src/mpfloat.rs
@@ -6,10 +6,10 @@
 use std::cmp::Ordering;
 use std::ffi::{c_int, c_long};
 
-use az::Az;
 use gmp_mpfr_sys::mpfr::rnd_t;
 use rug::Assign;
 pub use rug::Float as MpFloat;
+use rug::az::{self, Az};
 use rug::float::Round;
 use rug::float::Round::Nearest;
 use rug::ops::{PowAssignRound, RemAssignRound};
diff --git a/library/compiler-builtins/libm/crates/util/Cargo.toml b/library/compiler-builtins/libm/crates/util/Cargo.toml
index 51f44dddfaf7..8005459dbf93 100644
--- a/library/compiler-builtins/libm/crates/util/Cargo.toml
+++ b/library/compiler-builtins/libm/crates/util/Cargo.toml
@@ -7,11 +7,10 @@ publish = false
 [features]
 default = ["build-musl", "build-mpfr", "unstable-float"]
 build-musl = ["libm-test/build-musl", "dep:musl-math-sys"]
-build-mpfr = ["libm-test/build-mpfr", "dep:az", "dep:rug"]
+build-mpfr = ["libm-test/build-mpfr", "dep:rug"]
 unstable-float = ["libm/unstable-float", "libm-test/unstable-float", "rug?/nightly-float"]
 
 [dependencies]
-az = { version = "1.2.1", optional = true }
 libm = { path = "../..", default-features = false }
 libm-macros = { path = "../libm-macros" }
 libm-test = { path = "../libm-test", default-features = false }
diff --git a/library/compiler-builtins/libm/crates/util/src/main.rs b/library/compiler-builtins/libm/crates/util/src/main.rs
index f4ee8fd2e386..6ea1be3d9aed 100644
--- a/library/compiler-builtins/libm/crates/util/src/main.rs
+++ b/library/compiler-builtins/libm/crates/util/src/main.rs
@@ -8,12 +8,12 @@ use std::env;
 use std::num::ParseIntError;
 use std::str::FromStr;
 
-#[cfg(feature = "build-mpfr")]
-use az::Az;
 use libm::support::{hf32, hf64};
 #[cfg(feature = "build-mpfr")]
 use libm_test::mpfloat::MpOp;
 use libm_test::{MathOp, TupleCall};
+#[cfg(feature = "build-mpfr")]
+use rug::az::{self, Az};
 
 const USAGE: &str = "\
 usage: