diff --git a/.github/workflows/build_rpi3.yml b/.github/workflows/build_rpi3.yml
index 89467cff..08c96d9e 100644
--- a/.github/workflows/build_rpi3.yml
+++ b/.github/workflows/build_rpi3.yml
@@ -32,7 +32,8 @@ jobs:
     - name: Set up Rust nightly
       run: |
           rustup self update
-          rustup toolchain install `cat rust-toolchain | tr '\n' ' '` --component rust-src llvm-tools-preview
+          rustup toolchain install nightly --component rust-src llvm-tools-preview
+          rustup default nightly
           cargo install cargo-xbuild cargo-binutils
     - name: Make all
       run: |
diff --git a/.github/workflows/build_rpi4.yml b/.github/workflows/build_rpi4.yml
index 2c8761d0..6d23070b 100644
--- a/.github/workflows/build_rpi4.yml
+++ b/.github/workflows/build_rpi4.yml
@@ -32,7 +32,8 @@ jobs:
     - name: Set up Rust nightly
       run: |
           rustup self update
-          rustup toolchain install `cat rust-toolchain | tr '\n' ' '` --component rust-src llvm-tools-preview
+          rustup toolchain install nightly --component rust-src llvm-tools-preview
+          rustup default nightly
           cargo install cargo-xbuild cargo-binutils
     - name: Make all
       run: |
diff --git a/.github/workflows/check_fmt_clippy.yml b/.github/workflows/check_fmt_clippy.yml
index d6f54374..ef3d95b6 100644
--- a/.github/workflows/check_fmt_clippy.yml
+++ b/.github/workflows/check_fmt_clippy.yml
@@ -30,7 +30,8 @@ jobs:
     - name: Set up Rust nightly
       run: |
           rustup self update
-          rustup toolchain install `cat rust-toolchain | tr '\n' ' '` --component rustfmt clippy rust-src
+          rustup toolchain install nightly --component rustfmt clippy rust-src
+          rustup default nightly
           cargo install cargo-xbuild
     - name: Run cargo fmt
       run: |
diff --git a/rust-toolchain b/rust-toolchain
deleted file mode 100644
index 1a9a5fb7..00000000
--- a/rust-toolchain
+++ /dev/null
@@ -1 +0,0 @@
-nightly-2019-12-20