diff --git a/.cargo/config.toml b/.cargo/config.toml
index 7c81907f..9af4a1c2 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -1,5 +1,5 @@
 [alias]
 format       = "fmt"
 format-check = "fmt --check"
-lint         = "clippy --all-targets --all-features -- -D warnings"
-test-cover   = "llvm-cov --all-features --lcov --output-path lcov.info"
+lint         = "clippy --locked --all-targets --all-features -- -D warnings"
+test-cover   = "llvm-cov --locked --all-features --lcov --output-path lcov.info"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d3a592e6..fe268b53 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,7 +29,7 @@ jobs:
         uses: actions/checkout@v6
       - uses: Swatinem/rust-cache@v2
       - name: Test
-        run: cargo test --all-features
+        run: cargo test --locked --all-features
 
   lint:
     name: Linting (fmt + clippy)
@@ -52,7 +52,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
-      - run: cargo doc --all-features --no-deps --document-private-items
+      - run: cargo doc --locked --all-features --no-deps --document-private-items
         env:
           RUSTDOCFLAGS: -Dwarnings
 
@@ -78,7 +78,7 @@ jobs:
       - name: Install rust toolchain
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: nightly-2025-08-06
+          toolchain: nightly-2025-10-18
           # ^ sync with https://github.com/awslabs/cargo-check-external-types/blob/main/rust-toolchain.toml
       - run: cargo install --locked cargo-check-external-types
       - name: run cargo-check-external-types
diff --git a/.gitignore b/.gitignore
index a9d37c56..eb5a316c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1 @@
 target
-Cargo.lock
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 00000000..63b0cebf
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,188 @@
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