diff --git a/.github/workflows/ci-esp-idf-master.yml b/.github/workflows/ci-esp-idf-master.yml
index f66600228..ce2fc85bc 100644
--- a/.github/workflows/ci-esp-idf-master.yml
+++ b/.github/workflows/ci-esp-idf-master.yml
@@ -4,6 +4,9 @@ on:
   schedule:
     - cron: '50 5 * * *'
 
+env:
+  rust_toolchain: nightly-2022-03-23
+
 jobs:
   compile:
     name: Compile
@@ -14,12 +17,12 @@ jobs:
       - name: Setup | Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: nightly
+          toolchain: ${{ env.rust_toolchain }}
           components: rustfmt, clippy
       - name: Setup | Std
-        run: rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu
+        run: rustup component add rust-src --toolchain ${{ env.rust_toolchain }}-x86_64-unknown-linux-gnu
       - name: Setup | Default to nightly
-        run: rustup default nightly
+        run: rustup default ${{ env.rust_toolchain }}
       - name: Build | Fmt Check
         run: cargo fmt -- --check
       - name: Build | Compile Native ESP-IDF master no_std
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8b112bc3f..3d1409bc1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,6 +8,9 @@ on:
   schedule:
     - cron: '50 4 * * *'
 
+env:
+  rust_toolchain: nightly-2022-03-23
+
 jobs:
   compile:
     name: Compile
@@ -18,12 +21,12 @@ jobs:
       - name: Setup | Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: nightly
+          toolchain: ${{ env.rust_toolchain }}
           components: rustfmt, clippy
       - name: Setup | Std
-        run: rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu
+        run: rustup component add rust-src --toolchain ${{ env.rust_toolchain }}-x86_64-unknown-linux-gnu
       - name: Setup | Default to nightly
-        run: rustup default nightly
+        run: rustup default ${{ env.rust_toolchain }}
       - name: Build | Fmt Check
         run: cargo fmt -- --check
       - name: Build | Clippy
diff --git a/.github/workflows/publish-dry-run.yml b/.github/workflows/publish-dry-run.yml
index 3b5c79217..cf7d433a5 100644
--- a/.github/workflows/publish-dry-run.yml
+++ b/.github/workflows/publish-dry-run.yml
@@ -3,6 +3,9 @@ name: PublishDryRun
 on:
   workflow_dispatch
 
+env:
+  rust_toolchain: nightly-2022-03-23
+
 jobs:
   publishdryrun:
     name: Publish Dry Run
@@ -13,10 +16,10 @@ jobs:
       - name: Setup | Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: nightly
+          toolchain: ${{ env.rust_toolchain }}
       - name: Setup | Std
-        run: rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu
+        run: rustup component add rust-src --toolchain ${{ env.rust_toolchain }}-x86_64-unknown-linux-gnu
       - name: Setup | Default to nightly
-        run: rustup default nightly
+        run: rustup default ${{ env.rust_toolchain }}
       - name: Build | Publish Dry Run
         run: export ESP_IDF_TOOLS_INSTALL_DIR=out; export ESP_IDF_SDKCONFIG_DEFAULTS=$(pwd)/.github/configs/sdkconfig.defaults; cargo publish --dry-run --target riscv32imc-esp-espidf -Zbuild-std=std,panic_abort -Zbuild-std-features=panic_immediate_abort
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 263c76ec2..02587a8aa 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -3,6 +3,9 @@ name: Publish
 on:
   workflow_dispatch
 
+env:
+  rust_toolchain: nightly-2022-03-23
+
 jobs:
   publish:
     name: Publish
@@ -13,13 +16,11 @@ jobs:
       - name: Setup | Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: nightly
+          toolchain: ${{ env.rust_toolchain }}
       - name: Setup | Std
-        run: rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu
+        run: rustup component add rust-src --toolchain ${{ env.rust_toolchain }}-x86_64-unknown-linux-gnu
       - name: Setup | Default to nightly
-        run: rustup default nightly
-      - name: Setup | Default to nightly
-        run: rustup default nightly
+        run: rustup default ${{ env.rust_toolchain }}
       - name: Login
         run: cargo login ${{ secrets.crates_io_token }}
       - name: Build | Publish