diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8b78bee..f9ec1b6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,6 +11,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
+
+    # https://github.com/actions/cache/blob/main/examples.md#rust---cargo
+    - uses: actions/cache@v3
+      with:
+        path: |
+          ~/.cargo/bin/
+          ~/.cargo/registry/index/
+          ~/.cargo/registry/cache/
+          ~/.cargo/git/db/
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}-${{ hashFiles('**/rust-toolchain.toml') }}
+
     - name: Build
       run: cargo build --verbose
     - name: Run tests
diff --git a/.github/workflows/dpz-bot.yml b/.github/workflows/dpz-bot.yml
index c57caa9..f90364e 100644
--- a/.github/workflows/dpz-bot.yml
+++ b/.github/workflows/dpz-bot.yml
@@ -14,6 +14,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
+
+    # https://github.com/actions/cache/blob/main/examples.md#rust---cargo
+    - uses: actions/cache@v3
+      with:
+        path: |
+          ~/.cargo/bin/
+          ~/.cargo/registry/index/
+          ~/.cargo/registry/cache/
+          ~/.cargo/git/db/
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}-${{ hashFiles('**/rust-toolchain.toml') }}
+
     - name: Build
       run: cargo build
     - name: Run run
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..292fe49
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "stable"