diff --git a/Cargo.lock b/Cargo.lock
index d07531612e..0b85cbeb3c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1517,6 +1517,14 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "fractal"
+version = "0.1.0"
+source = "git+https://github.com/AdaWorldAPI/ndarray?branch=master#db3a7dde568eb6d7f8806faff58bc0aa17d2a733"
+dependencies = [
+ "libm",
+]
+
 [[package]]
 name = "fs-err"
 version = "3.3.1"
@@ -2499,13 +2507,15 @@ dependencies = [
 [[package]]
 name = "ndarray"
 version = "0.17.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520080814a7a6b4a6e9070823bb24b4531daac8c4627e08ba5de8c5ef2f2752d"
+source = "git+https://github.com/AdaWorldAPI/ndarray?branch=master#db3a7dde568eb6d7f8806faff58bc0aa17d2a733"
 dependencies = [
+ "fractal",
  "matrixmultiply",
  "num-complex",
  "num-integer",
  "num-traits",
+ "p64",
+ "paste",
  "portable-atomic",
  "portable-atomic-util",
  "rawpointer",
@@ -2946,6 +2956,14 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
 
+[[package]]
+name = "p64"
+version = "0.1.0"
+source = "git+https://github.com/AdaWorldAPI/ndarray?branch=master#db3a7dde568eb6d7f8806faff58bc0aa17d2a733"
+dependencies = [
+ "fractal",
+]
+
 [[package]]
 name = "page_size"
 version = "0.6.0"
diff --git a/Cargo.toml b/Cargo.toml
index 3cbe58e5c3..8264ba49b3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -124,7 +124,7 @@ default-members = [
 [workspace.package]
 # MSRV source of truth: CI derives the tested toolchain from this. Keep the
 # README rustc badge in sync when bumping.
-rust-version = "1.91"
+rust-version = "1.97"
 
 [workspace.dependencies]
 anstyle = "1.0.2"
@@ -265,3 +265,11 @@ opt-level = 2
 debug = false
 # strip = "debuginfo" does not work on android and ios
 incremental = false
+
+# AdaWorldAPI/ndarray fork: same 0.17.2 API surface as upstream, plus a
+# `simd`/`hpc` module (crate::simd::F32x16 etc.) with a LazyLock-cached
+# AVX-512 -> AVX2 -> NEON -> scalar dispatch tier (src/simd.rs,
+# src/simd_avx512.rs). Pinned via git (not a sibling path) so this
+# resolves in any checkout, CI included.
+[patch.crates-io]
+ndarray = { git = "https://github.com/AdaWorldAPI/ndarray", branch = "master" }
diff --git a/README.md b/README.md
index 0755a39815..655556c04c 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 ![tract-logo](assets/tract-logo/PNG/tract-horizontal-blue.png)
 
 ![Rust](https://img.shields.io/badge/rust-%23000000.svg?style=for-the-badge&logo=rust&logoColor=white)
-![rustc >= 1.91.0](https://img.shields.io/badge/rustc-%3E%3D1.91.0-brightgreen)
+![rustc >= 1.97.0](https://img.shields.io/badge/rustc-%3E%3D1.97.0-brightgreen)
 ![MIT/Apache 2](https://img.shields.io/crates/l/tract)
 [![Native Linux test status](https://github.com/sonos/tract/workflows/Native%20Linux/badge.svg)](https://github.com/sonos/tract/actions)
 [![Embedded targets status](https://github.com/sonos/tract/workflows/Embedded%20targets/badge.svg)](https://github.com/sonos/tract/actions)
diff --git a/api/rs/deny.toml b/api/rs/deny.toml
index 0ec5a9aa9c..00db08df14 100644
--- a/api/rs/deny.toml
+++ b/api/rs/deny.toml
@@ -49,6 +49,7 @@ skip = [
 # trusted git sources.
 allow-git = [
     "https://github.com/rustformers/llm.git",
+    "https://github.com/AdaWorldAPI/ndarray",
 ]
 
 [licenses]
diff --git a/cli/deny.toml b/cli/deny.toml
index bee6142bb0..dab870aa0e 100644
--- a/cli/deny.toml
+++ b/cli/deny.toml
@@ -35,6 +35,7 @@ deny = [
 # trusted git sources.
 allow-git = [
     "https://github.com/rustformers/llm.git",
+    "https://github.com/AdaWorldAPI/ndarray",
 ]
 
 [licenses]