diff --git a/13_integrated_testing/README.md b/13_integrated_testing/README.md
index 94a52ebf..bb2942bd 100644
--- a/13_integrated_testing/README.md
+++ b/13_integrated_testing/README.md
@@ -1096,7 +1096,7 @@ diff -uNr 12_exceptions_part1_groundwork/src/exception.rs 13_integrated_testing/
 diff -uNr 12_exceptions_part1_groundwork/src/lib.rs 13_integrated_testing/src/lib.rs
 --- 12_exceptions_part1_groundwork/src/lib.rs
 +++ 13_integrated_testing/src/lib.rs
-@@ -0,0 +1,170 @@
+@@ -0,0 +1,169 @@
 +// SPDX-License-Identifier: MIT OR Apache-2.0
 +//
 +// Copyright (c) 2018-2020 Andre Richter <andre.o.richter@gmail.com>
@@ -1217,7 +1217,6 @@ diff -uNr 12_exceptions_part1_groundwork/src/lib.rs 13_integrated_testing/src/li
 +#![no_std]
 +// Testing
 +#![cfg_attr(test, no_main)]
-+#![cfg_attr(test, feature(slice_ptr_range))]
 +#![feature(custom_test_frameworks)]
 +#![reexport_test_harness_main = "test_main"]
 +#![test_runner(crate::test_runner)]
diff --git a/13_integrated_testing/src/lib.rs b/13_integrated_testing/src/lib.rs
index 82a8981d..5bd45be4 100644
--- a/13_integrated_testing/src/lib.rs
+++ b/13_integrated_testing/src/lib.rs
@@ -118,7 +118,6 @@
 #![no_std]
 // Testing
 #![cfg_attr(test, no_main)]
-#![cfg_attr(test, feature(slice_ptr_range))]
 #![feature(custom_test_frameworks)]
 #![reexport_test_harness_main = "test_main"]
 #![test_runner(crate::test_runner)]
diff --git a/14_exceptions_part2_peripheral_IRQs/README.md b/14_exceptions_part2_peripheral_IRQs/README.md
index 41486728..61280808 100644
--- a/14_exceptions_part2_peripheral_IRQs/README.md
+++ b/14_exceptions_part2_peripheral_IRQs/README.md
@@ -2414,7 +2414,7 @@ diff -uNr 13_integrated_testing/src/lib.rs 14_exceptions_part2_peripheral_IRQs/s
  #![feature(format_args_nl)]
  #![feature(global_asm)]
  #![feature(linkage)]
-@@ -137,6 +144,7 @@
+@@ -136,6 +143,7 @@
  pub mod exception;
  pub mod memory;
  pub mod print;
diff --git a/14_exceptions_part2_peripheral_IRQs/src/lib.rs b/14_exceptions_part2_peripheral_IRQs/src/lib.rs
index 51516f52..ddb7f67f 100644
--- a/14_exceptions_part2_peripheral_IRQs/src/lib.rs
+++ b/14_exceptions_part2_peripheral_IRQs/src/lib.rs
@@ -125,7 +125,6 @@
 #![no_std]
 // Testing
 #![cfg_attr(test, no_main)]
-#![cfg_attr(test, feature(slice_ptr_range))]
 #![feature(custom_test_frameworks)]
 #![reexport_test_harness_main = "test_main"]
 #![test_runner(crate::test_runner)]
diff --git a/README.CN.md b/README.CN.md
index 7ace7d62..c8906086 100644
--- a/README.CN.md
+++ b/README.CN.md
@@ -52,8 +52,8 @@ _带上我最诚挚的问候,<br>Andre ([@andre-richter])_
 3. 安装正确的`Rust`工具链:
    1. 如果你已经安装了一个版本的Rust:
       ```bash
-      rustup toolchain add nightly-2020-09-24
-      rustup default nightly-2020-09-24
+      rustup toolchain add nightly-2020-10-04
+      rustup default nightly-2020-10-04
       rustup component add llvm-tools-preview
       rustup target add aarch64-unknown-none-softfloat
       cargo install cargo-binutils
@@ -62,7 +62,7 @@ _带上我最诚挚的问候,<br>Andre ([@andre-richter])_
    2. 如果你想要全新安装:
       ```bash
       curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- \
-          --default-toolchain nightly-2020-09-24                           \
+          --default-toolchain nightly-2020-10-04                           \
           --component llvm-tools-preview
 
       source $HOME/.cargo/env
diff --git a/README.md b/README.md
index a38a4e8c..dc034b1d 100644
--- a/README.md
+++ b/README.md
@@ -68,8 +68,8 @@ other Unix flavors such as **macOS**, but this is only _experimental_.
 1. Install a suitable `Rust` toolchain:
    1. If you already have a version of Rust installed:
       ```bash
-      rustup toolchain add nightly-2020-09-24
-      rustup default nightly-2020-09-24
+      rustup toolchain add nightly-2020-10-04
+      rustup default nightly-2020-10-04
       rustup component add llvm-tools-preview
       rustup target add aarch64-unknown-none-softfloat
       cargo install cargo-binutils
@@ -78,7 +78,7 @@ other Unix flavors such as **macOS**, but this is only _experimental_.
    2. If you need a fresh install:
       ```bash
       curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- \
-          --default-toolchain nightly-2020-09-24                           \
+          --default-toolchain nightly-2020-10-04                           \
           --component llvm-tools-preview
 
       source $HOME/.cargo/env