diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index cc98a65d..1a14ee4a 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -46,8 +46,8 @@ env:
   # ADD to the cargo config, it REPLACES it. Re-read `.cargo/config.toml`
   # before changing this value and carry forward anything still needed.
   RUSTFLAGS: '-D warnings --cfg curve25519_dalek_backend="serial" --cfg poly1305_force_soft'
-  MSRV: 1.98.1
-  BLAS_MSRV: 1.98.1
+  MSRV: 1.99.0
+  BLAS_MSRV: 1.99.0
 
 jobs:
   pass-msrv:
@@ -74,11 +74,11 @@ jobs:
         # them move together with the toolchain file, and its bump log is the
         # one place that records WHY each move happened.
         rust:
-          - "1.98.1"
+          - "1.99.0"
     name: clippy/${{ matrix.rust }}
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@1.98.1
+      - uses: dtolnay/rust-toolchain@1.99.0
         with:
           components: clippy
       - uses: Swatinem/rust-cache@v2
@@ -103,7 +103,7 @@ jobs:
       # Stable rustfmt on the pinned channel (see `rust-toolchain.toml`;
       # version deliberately not restated here). No nightly dependency since
       # rustfmt.toml is stable-clean post-PR #133.
-      - uses: dtolnay/rust-toolchain@1.98.1
+      - uses: dtolnay/rust-toolchain@1.99.0
         with:
           components: rustfmt
       - run: cargo fmt --all --check
@@ -236,7 +236,7 @@ jobs:
     name: hpc-stream-parallel/rayon
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@1.98.1
+      - uses: dtolnay/rust-toolchain@1.99.0
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@nextest
       - name: cargo check (no rayon — scalar path unchanged)
diff --git a/Cargo.toml b/Cargo.toml
index 71dc1d87..8848304c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ edition = "2021"
 # of the contract crate happens to still succeed today — a coincidence, not a
 # guarantee, and exactly what an untested MSRV declaration buys. Declare what is
 # actually verified.
-rust-version = "1.98.1"
+rust-version = "1.99.0"
 authors = [
   "Ulrik Sverdrup \"bluss\"",
   "Jim Turner"
diff --git a/Dockerfile b/Dockerfile
index b8bd2bd4..f6e85c28 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -27,8 +27,8 @@ ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \
     PATH=/usr/local/cargo/bin:$PATH
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | \
-    sh -s -- -y --default-toolchain 1.98.1 --profile minimal \
-    && rustc --version | grep -q "1.98.1"
+    sh -s -- -y --default-toolchain 1.99.0 --profile minimal \
+    && rustc --version | grep -q "1.99.0"
 
 WORKDIR /app
 
diff --git a/Dockerfile.avx512 b/Dockerfile.avx512
index f53f1802..b29e8b10 100644
--- a/Dockerfile.avx512
+++ b/Dockerfile.avx512
@@ -21,8 +21,8 @@ ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \
     PATH=/usr/local/cargo/bin:$PATH
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | \
-    sh -s -- -y --default-toolchain 1.98.1 --profile minimal \
-    && rustc --version | grep -q "1.98.1"
+    sh -s -- -y --default-toolchain 1.99.0 --profile minimal \
+    && rustc --version | grep -q "1.99.0"
 
 WORKDIR /app
 
diff --git a/crates/encryption/Cargo.toml b/crates/encryption/Cargo.toml
index e7046a37..a4f42277 100644
--- a/crates/encryption/Cargo.toml
+++ b/crates/encryption/Cargo.toml
@@ -2,7 +2,7 @@
 name = "encryption"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.98.1"
+rust-version = "1.99.0"
 license = "MIT OR Apache-2.0"
 description = "Zero-knowledge envelope crypto for the Ada stack: Argon2id KDF, XChaCha20-Poly1305 AEAD, Ed25519 signatures, SHA-384 hashing. One codebase for native servers and wasm32 browsers."
 publish = false
diff --git a/crates/fractal/Cargo.toml b/crates/fractal/Cargo.toml
index 06bc7f08..822cbaed 100644
--- a/crates/fractal/Cargo.toml
+++ b/crates/fractal/Cargo.toml
@@ -2,7 +2,7 @@
 name = "fractal"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.98.1"
+rust-version = "1.99.0"
 description = "7+1 phyllotactic SIMD manifold with Euler-gamma singularity correction"
 license = "MIT OR Apache-2.0"
 
diff --git a/crates/p64/Cargo.toml b/crates/p64/Cargo.toml
index c9daa43b..f36ccce3 100644
--- a/crates/p64/Cargo.toml
+++ b/crates/p64/Cargo.toml
@@ -2,7 +2,7 @@
 name = "p64"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.98.1"
+rust-version = "1.99.0"
 description = "Palette64: 64×64 BNN attention matrix from 8 phyllotactic HEEL planes"
 license = "MIT OR Apache-2.0"
 
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 06fb5ae5..f9090701 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,5 +1,5 @@
 [toolchain]
-channel = "1.98.1"
+channel = "1.99.0"
 # The pinned version is the `channel` line ABOVE — deliberately not restated
 # here. This comment used to open "Pinned to 1.97.1", and this file's own
 # warning explains why that is a trap: "A stale comment on a version pin is how
diff --git a/tests/numeric.rs b/tests/numeric.rs
index adf8ef99..0dcb5445 100644
--- a/tests/numeric.rs
+++ b/tests/numeric.rs
@@ -4,7 +4,6 @@
 
 use approx::assert_abs_diff_eq;
 use ndarray::{arr0, arr1, arr2, array, aview1, Array, Array1, Array2, Array3, Axis};
-use std::f64;
 
 #[test]
 fn test_mean_with_nan_values() {