diff --git a/.github/workflows/doc-and-test.yml b/.github/workflows/doc-and-test.yml
index 1c4199e8..d1fcebb5 100644
--- a/.github/workflows/doc-and-test.yml
+++ b/.github/workflows/doc-and-test.yml
@@ -4,6 +4,7 @@ on: [push]
 
 env:
   CARGO_TERM_COLOR: always
+  rust_toolchain: nightly-2022-08-05
 
 jobs:
   build-doc:
@@ -13,7 +14,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: nightly-2022-07-20
+          toolchain: ${{ env.rust_toolchain }}
           components: rust-src, llvm-tools-preview
           target: riscv64gc-unknown-none-elf
       - name: Build doc
@@ -32,7 +33,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: nightly-2022-07-20
+          toolchain: ${{ env.rust_toolchain }}
           components: rust-src, llvm-tools-preview
           target: riscv64gc-unknown-none-elf
       - uses: actions-rs/install@v0.1
@@ -66,4 +67,4 @@ jobs:
         timeout-minutes: 10
 
       - name: Build for k210
-        run: cd os && make build BOARD=k210
\ No newline at end of file
+        run: cd os && make build BOARD=k210
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index c56a59e0..553747b2 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,5 @@
 [toolchain]
 profile = "minimal"
-channel = "nightly-2022-07-20"
+# use the nightly version of the last stable toolchain, see <https://forge.rust-lang.org/>
+channel = "nightly-2022-08-05"
 components = ["rust-src", "llvm-tools-preview", "rustfmt", "clippy"]