diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index a42b4c7..1fe4e30 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -43,7 +43,10 @@ jobs:
           args: --workspace --all-features --all-targets --locked
       - name: Cargo fmt
         if: matrix.action == 'fmt'
-        run: cargo fmt --all -- --check
+        run: |
+          rustup toolchain install nightly
+          rustup component add rustfmt --toolchain nightly
+          cargo +nightly fmt --all -- --check
       - name: Install cargo-nextest
         if: matrix.action == 'nextest'
         uses: taiki-e/install-action@nextest
diff --git a/.gitignore b/.gitignore
index 0431c78..e88a27a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,14 @@
 # System
 .DS_Store
 
-# Integrated Development Environment
-.idea
+# Integrated development environment
 .vscode
 
-# Package Manager
+# Package manager
 ## Cargo
 target
+## NPM
+node_modules
+
+# Test data
+tmp
diff --git a/Cargo.lock b/Cargo.lock
index 5b1c710..8d2769c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,27 +4,27 @@ version = 3
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.78"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.35"
+version = "1.0.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
+checksum = "0fa76aaf39101c457836aec0ce2316dbdc3ab723cdda1c6bd4e6ad4208acaca7"
 dependencies = [
  "proc-macro2",
 ]
 
 [[package]]
 name = "syn"
-version = "2.0.48"
+version = "2.0.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0f3531638e407dfc0814761abb7c00a5b54992b849452a0646b7f65c9f770f3f"
+checksum = "901fa70d88b9d6c98022e23b4136f9f3e54e4662c3bc1bd1d84a42a9a0f0c1e9"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -53,7 +53,7 @@ dependencies = [
 
 [[package]]
 name = "unescaper"
-version = "0.1.4"
+version = "0.1.5"
 dependencies = [
  "thiserror",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index b0f674b..339dea0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ license = "GPL-3.0/MIT"
 name = "unescaper"
 readme = "README.md"
 repository = "https://github.com/hack-ink/unescaper"
-version = "0.1.4"
+version = "0.1.5"
 
 [profile.ci-dev]
 incremental = false
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 58a3a16..e5da0e7 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
-channel    = "nightly"
-components = ["cargo", "clippy", "rustc", "rustfmt", "rust-src"]
+channel    = "stable"
+components = ["cargo", "clippy", "rust-src", "rustc", "rustfmt"]
 profile    = "minimal"