diff --git a/boards/matrix_portal_m4/Cargo.toml b/boards/matrix_portal_m4/Cargo.toml
index add3589b524..26385dacad2 100644
--- a/boards/matrix_portal_m4/Cargo.toml
+++ b/boards/matrix_portal_m4/Cargo.toml
@@ -19,7 +19,6 @@ version = "0.7"
 optional = true
 
 [dependencies.atsamd-hal]
-path = "../../hal"
 version = "0.16.0"
 default-features = false
 
@@ -29,7 +28,6 @@ optional = true
 
 [dependencies.cortex-m]
 version = "0.7"
-features = ["critical-section-single-core"]
 
 [dev-dependencies]
 panic-halt = "0.2"
diff --git a/boards/matrix_portal_m4/README.md b/boards/matrix_portal_m4/README.md
index 40574d90d51..d3713264a54 100644
--- a/boards/matrix_portal_m4/README.md
+++ b/boards/matrix_portal_m4/README.md
@@ -4,7 +4,7 @@ This crate provides a type-safe API for working with the [Adafruit Matrix Portal
 board](https://www.adafruit.com/product/4745).
 
 ## Prerequisites
-* Install the cross compile toolchain `rustup target add thumbv6m-none-eabi`
+* Install the cross compile toolchain `rustup target add thumbv7em-none-eabihf`
 * Install [cargo-hf2 the hf2 bootloader flasher tool](https://crates.io/crates/cargo-hf2) however your platform requires
 
 ## Uploading an example
diff --git a/crates.json b/crates.json
index 1defd358976..cae374805a1 100644
--- a/crates.json
+++ b/crates.json
@@ -66,7 +66,7 @@
       "target": "thumbv7em-none-eabihf"
     },
     "matrix_portal_m4": {
-      "tier": 1,
+      "tier": 2,
       "build": "cargo build --examples --all-features",
       "target": "thumbv7em-none-eabihf"
     },