diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9c0422d0..b9aaf13d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,19 +27,19 @@ jobs:
         tool:
           # Note: Specifying the version of valgrind and wasm-pack is not supported.
           # cargo-watch is supported by cargo-binstall (through quickinstall)
-          - cargo-hack,cargo-llvm-cov,cargo-minimal-versions,parse-changelog,cross,nextest,shellcheck,shfmt,valgrind,wasm-pack,wasmtime,mdbook,mdbook-linkcheck,cargo-watch
-          - cargo-hack@0.5.16,cargo-llvm-cov@0.4.13,cargo-minimal-versions@0.1.5,parse-changelog@0.5.0,cross@0.2.4,nextest@0.9.11,shellcheck@0.8.0,shfmt@3.5.1,wasmtime@0.39.1,mdbook@0.4.21,mdbook-linkcheck@0.7.6,cargo-watch@8.1.1
+          - cargo-hack,cargo-llvm-cov,cargo-minimal-versions,parse-changelog,cross,nextest,protoc,shellcheck,shfmt,valgrind,wasm-pack,wasmtime,mdbook,mdbook-linkcheck,cargo-watch
+          - cargo-hack@0.5.16,cargo-llvm-cov@0.4.13,cargo-minimal-versions@0.1.5,parse-changelog@0.5.0,cross@0.2.4,nextest@0.9.11,protoc@3.21.4,shellcheck@0.8.0,shfmt@3.5.1,wasmtime@0.39.1,mdbook@0.4.21,mdbook-linkcheck@0.7.6,cargo-watch@8.1.1
           # Nextest supports basic version ranges as well
           - nextest@0.9
         include:
           # Note: mdBook binary is incompatible with ubuntu 18.04,
           # see https://github.com/rust-lang/mdBook/issues/1779
           - os: ubuntu-18.04
-            tool: cargo-hack,cargo-llvm-cov,cargo-minimal-versions,parse-changelog,cross,nextest,shellcheck,shfmt,valgrind,wasm-pack,wasmtime,mdbook-linkcheck,cargo-watch
+            tool: cargo-hack,cargo-llvm-cov,cargo-minimal-versions,parse-changelog,cross,nextest,protoc,shellcheck,shfmt,valgrind,wasm-pack,wasmtime,mdbook-linkcheck,cargo-watch
           - os: macos-11
-            tool: cargo-hack,cargo-llvm-cov,cargo-minimal-versions,parse-changelog,cross,nextest,shellcheck,shfmt,wasm-pack,wasmtime,mdbook,mdbook-linkcheck,cargo-watch
+            tool: cargo-hack,cargo-llvm-cov,cargo-minimal-versions,parse-changelog,cross,nextest,protoc,shellcheck,shfmt,wasm-pack,wasmtime,mdbook,mdbook-linkcheck,cargo-watch
           - os: windows-2019
-            tool: cargo-hack,cargo-llvm-cov,cargo-minimal-versions,parse-changelog,cross,nextest,wasmtime,mdbook,mdbook-linkcheck,cargo-watch
+            tool: cargo-hack,cargo-llvm-cov,cargo-minimal-versions,parse-changelog,cross,nextest,protoc,shellcheck,shfmt,wasmtime,mdbook,mdbook-linkcheck,cargo-watch
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a13d6b0b..59978926 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,10 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Support `protoc`.
+- Support `shellcheck` on Windows.
+- Support `shfmt` on Windows.
+
 ## [1.8.4] - 2022-08-01
 
 - Update `cargo-llvm-cov@latest` to 0.4.13.
@@ -25,13 +29,13 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [1.8.1] - 2022-07-26
 
-- Fix cargo-binstall installation failure.
+- Fix `cargo-binstall` installation failure.
 
 ## [1.8.0] - 2022-07-26
 
 - Only use musl binaries for nextest if glibc isn't available. See [#13](https://github.com/taiki-e/install-action/issues/13) for more.
 
-- Fix cargo-binstall installation failure. ([#16](https://github.com/taiki-e/install-action/pull/16), thanks @CAD97)
+- Fix `cargo-binstall` installation failure. ([#16](https://github.com/taiki-e/install-action/pull/16), thanks @CAD97)
 
 - Accept `cargo-nextest` as an alias for `nextest`. ([#15](https://github.com/taiki-e/install-action/pull/15), thanks @CAD97)
 
@@ -45,15 +49,15 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [1.6.0] - 2022-07-25
 
-- Support mdbook-linkcheck.
-- Support mdbook on Windows.
-- Support wasmtime on Windows.
-- Support nextest on Linux (musl).
+- Support `mdbook-linkcheck`.
+- Support `mdbook` on Windows.
+- Support `wasmtime` on Windows.
+- Support `nextest` on Linux (musl).
 - Fix installation failure when `$CARGO_HOME/bin` and `$HOME/.cargo/bin` is not available.
 
 ## [1.5.11] - 2022-07-25
 
-- Fix cargo-binstall installation on macOS and Windows.
+- Fix `cargo-binstall` installation on macOS and Windows.
 
 ## [1.5.10] - 2022-07-24
 
diff --git a/README.md b/README.md
index b6911ac2..d11980e1 100644
--- a/README.md
+++ b/README.md
@@ -70,19 +70,21 @@ https://spdx.org/licenses
 | [**cargo-llvm-cov**](https://github.com/taiki-e/cargo-llvm-cov) | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/taiki-e/cargo-llvm-cov/releases) | Linux, macOS, Windows | [Apache-2.0](https://github.com/taiki-e/cargo-llvm-cov/blob/HEAD/LICENSE-APACHE) OR [MIT](https://github.com/taiki-e/cargo-llvm-cov/blob/HEAD/LICENSE-MIT) |
 | [**cargo-minimal-versions**](https://github.com/taiki-e/cargo-minimal-versions) | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/taiki-e/cargo-minimal-versions/releases) | Linux, macOS, Windows | [Apache-2.0](https://github.com/taiki-e/cargo-minimal-versions/blob/HEAD/LICENSE-APACHE) OR [MIT](https://github.com/taiki-e/cargo-minimal-versions/blob/HEAD/LICENSE-MIT) |
 | [**parse-changelog**](https://github.com/taiki-e/parse-changelog) | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/taiki-e/parse-changelog/releases) | Linux, macOS, Windows | [Apache-2.0](https://github.com/taiki-e/parse-changelog/blob/HEAD/LICENSE-APACHE) OR [MIT](https://github.com/taiki-e/parse-changelog/blob/HEAD/LICENSE-MIT) |
+| [**cargo-binstall**][cargo-binstall] | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/ryankurte/cargo-binstall/releases) | Linux, macOS, Windows | [GPL-3.0](https://github.com/ryankurte/cargo-binstall/blob/HEAD/LICENSE.txt) |
 | [**cross**](https://github.com/cross-rs/cross) | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/cross-rs/cross/releases) | Linux, macOS, Windows | [Apache-2.0](https://github.com/cross-rs/cross/blob/HEAD/LICENSE-APACHE) OR [MIT](https://github.com/cross-rs/cross/blob/HEAD/LICENSE-MIT) |
+| [**mdbook-linkcheck**](https://github.com/Michael-F-Bryan/mdbook-linkcheck) | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/Michael-F-Bryan/mdbook-linkcheck/releases) | Linux, macOS, Windows | [MIT](https://github.com/Michael-F-Bryan/mdbook-linkcheck/blob/HEAD/LICENSE) |
+| [**mdbook**](https://github.com/rust-lang/mdBook) | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/rust-lang/mdBook/releases) | Linux, macOS, Windows | [MPL-2.0](https://github.com/rust-lang/mdBook/blob/HEAD/LICENSE) |
 | [**nextest**](https://github.com/nextest-rs/nextest) (alias: `cargo-nextest`) | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/nextest-rs/nextest/releases) | Linux, macOS, Windows | [Apache-2.0](https://github.com/nextest-rs/nextest/blob/HEAD/LICENSE-APACHE) OR [MIT](https://github.com/nextest-rs/nextest/blob/HEAD/LICENSE-MIT) |
-| [**shellcheck**](https://www.shellcheck.net) | `/usr/local/bin` | [GitHub Releases](https://github.com/koalaman/shellcheck/releases) | Linux, macOS | [GPL-3.0-or-later](https://github.com/koalaman/shellcheck/blob/HEAD/LICENSE) |
-| [**shfmt**](https://github.com/mvdan/sh) | `/usr/local/bin` | [GitHub Releases](https://github.com/mvdan/sh/releases) | Linux, macOS | [BSD-3-Clause](https://github.com/mvdan/sh/blob/HEAD/LICENSE) |
+| [**protoc**](https://github.com/protocolbuffers/protobuf) | `/usr/local/bin` | [GitHub Releases](https://github.com/protocolbuffers/protobuf/releases) | Linux, macOS, Windows | [BSD-3-Clause](https://github.com/protocolbuffers/protobuf/blob/HEAD/LICENSE) |
+| [**shellcheck**](https://www.shellcheck.net) | `/usr/local/bin` | [GitHub Releases](https://github.com/koalaman/shellcheck/releases) | Linux, macOS, Windows | [GPL-3.0-or-later](https://github.com/koalaman/shellcheck/blob/HEAD/LICENSE) |
+| [**shfmt**](https://github.com/mvdan/sh) | `/usr/local/bin` | [GitHub Releases](https://github.com/mvdan/sh/releases) | Linux, macOS, Windows | [BSD-3-Clause](https://github.com/mvdan/sh/blob/HEAD/LICENSE) |
 | [**valgrind**](https://valgrind.org) | `/snap/bin` | [snap](https://snapcraft.io/install/valgrind/ubuntu) | Linux | [GPL-2.0-or-later](https://valgrind.org/docs/manual/license.gpl.html) |
 | [**wasm-pack**](https://github.com/rustwasm/wasm-pack) | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/rustwasm/wasm-pack/releases) | Linux, macOS | [Apache-2.0](https://github.com/rustwasm/wasm-pack/blob/HEAD/LICENSE-APACHE) OR [MIT](https://github.com/rustwasm/wasm-pack/blob/HEAD/LICENSE-MIT) |
 | [**wasmtime**](https://github.com/bytecodealliance/wasmtime) | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/bytecodealliance/wasmtime/releases) | Linux, macOS, Windows | [Apache-2.0 WITH LLVM-exception](https://github.com/bytecodealliance/wasmtime/blob/HEAD/LICENSE) |
-| [**mdbook**](https://github.com/rust-lang/mdBook) | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/rust-lang/mdBook/releases) | Linux, macOS, Windows | [MPL-2.0](https://github.com/rust-lang/mdBook/blob/HEAD/LICENSE) |
-| [**mdbook-linkcheck**](https://github.com/Michael-F-Bryan/mdbook-linkcheck) | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/Michael-F-Bryan/mdbook-linkcheck/releases) | Linux, macOS, Windows | [MIT](https://github.com/Michael-F-Bryan/mdbook-linkcheck/blob/HEAD/LICENSE) |
-| [**cargo-binstall**][cargo-binstall] | `$CARGO_HOME/bin` | [GitHub Releases](https://github.com/ryankurte/cargo-binstall/releases) | Linux, macOS, Windows | [GPL-3.0](https://github.com/ryankurte/cargo-binstall/blob/HEAD/LICENSE.txt) |
 
 If `$CARGO_HOME/bin` is not available, Rust-related binaries will be installed to `$HOME/.cargo/bin`.
 If `$HOME/.cargo/bin` is not available, Rust-related binaries will be installed to `/usr/local/bin`.
+If `/usr/local/bin` is not available, all binaries will be installed to `$HOME/.install-action/bin`.
 
 If a tool not included in the list above is specified, this action uses [cargo-binstall] as a fallback.
 
diff --git a/main.sh b/main.sh
index 37db4d6c..918f0789 100755
--- a/main.sh
+++ b/main.sh
@@ -34,6 +34,16 @@ download() {
     local url="$1"
     local bin_dir="$2"
     local bin="$3"
+    if [[ "${bin_dir}" == "/usr/"* ]]; then
+        if [[ ! -d "${bin_dir}" ]]; then
+            bin_dir="${HOME}/.install-action/bin"
+            if [[ ! -d "${bin_dir}" ]]; then
+                mkdir -p "${bin_dir}"
+                echo "${bin_dir}" >>"${GITHUB_PATH}"
+                export PATH="${PATH}:${bin_dir}"
+            fi
+        fi
+    fi
     local tar_args=()
     case "${url}" in
         *.tar.gz | *.tgz) tar_args+=("xzf") ;;
@@ -213,6 +223,23 @@ for tool in "${tools[@]}"; do
             retry curl --proto '=https' --tlsv1.2 -fsSL --retry 10 --retry-connrefused "${url}" \
                 | tar xzf - -C "${cargo_bin}"
             ;;
+        protoc)
+            # https://github.com/protocolbuffers/protobuf/releases
+            latest_version="3.21.4"
+            repo="protocolbuffers/protobuf"
+            case "${version}" in
+                latest) version="${latest_version}" ;;
+            esac
+            miner_patch_version="${latest_version#*.}"
+            base_url="https://github.com/${repo}/releases/download/v${miner_patch_version}/protoc-${miner_patch_version}"
+            case "${OSTYPE}" in
+                linux*) url="${base_url}-linux-x86_64.zip" ;;
+                darwin*) url="${base_url}-osx-x86_64.zip" ;;
+                cygwin* | msys*) url="${base_url}-win64.zip" ;;
+                *) bail "unsupported OSTYPE '${OSTYPE}' for ${tool}" ;;
+            esac
+            download "${url}" /usr/local/bin "bin/protoc${exe}"
+            ;;
         shellcheck)
             # https://github.com/koalaman/shellcheck/releases
             latest_version="0.8.0"
@@ -221,6 +248,7 @@ for tool in "${tools[@]}"; do
                 latest) version="${latest_version}" ;;
             esac
             base_url="https://github.com/${repo}/releases/download/v${version}/shellcheck-v${version}"
+            bin="shellcheck-v${version}/shellcheck${exe}"
             case "${OSTYPE}" in
                 linux*)
                     if type -P shellcheck &>/dev/null; then
@@ -230,25 +258,29 @@ for tool in "${tools[@]}"; do
                     ;;
                 darwin*) url="${base_url}.darwin.x86_64.tar.xz" ;;
                 cygwin* | msys*)
-                    # TODO: In what directory should we install the binaries?
-                    # url="${base_url}.zip"
-                    bail "${tool} for windows is not supported yet by this action"
+                    url="${base_url}.zip"
+                    bin="shellcheck${exe}"
                     ;;
                 *) bail "unsupported OSTYPE '${OSTYPE}' for ${tool}" ;;
             esac
-            download "${url}" /usr/local/bin "shellcheck-v${version}/shellcheck"
+            download "${url}" /usr/local/bin "${bin}"
             ;;
         shfmt)
             # https://github.com/mvdan/sh/releases
             latest_version="3.5.1"
             repo="mvdan/sh"
+            bin_dir="/usr/local/bin"
             case "${OSTYPE}" in
                 linux*) target="linux_amd64" ;;
                 darwin*) target="darwin_amd64" ;;
                 cygwin* | msys*)
-                    # TODO: In what directory should we install the binaries?
-                    # target="windows_amd64"
-                    bail "${tool} for windows is not supported yet by this action"
+                    target="windows_amd64"
+                    bin_dir="${HOME}/.install-action/bin"
+                    if [[ ! -d "${bin_dir}" ]]; then
+                        mkdir -p "${bin_dir}"
+                        echo "${bin_dir}" >>"${GITHUB_PATH}"
+                        export PATH="${PATH}:${bin_dir}"
+                    fi
                     ;;
                 *) bail "unsupported OSTYPE '${OSTYPE}' for ${tool}" ;;
             esac
@@ -257,8 +289,10 @@ for tool in "${tools[@]}"; do
             esac
             url="https://github.com/${repo}/releases/download/v${version}/shfmt_v${version}_${target}${exe}"
             info "downloading ${url}"
-            retry curl --proto '=https' --tlsv1.2 -fsSL --retry 10 --retry-connrefused -o /usr/local/bin/shfmt "${url}"
-            chmod +x /usr/local/bin/shfmt
+            retry curl --proto '=https' --tlsv1.2 -fsSL --retry 10 --retry-connrefused -o "${bin_dir}/shfmt${exe}" "${url}"
+            case "${OSTYPE}" in
+                linux* | darwin*) chmod +x "${bin_dir}/shfmt${exe}" ;;
+            esac
             ;;
         valgrind)
             case "${OSTYPE}" in
diff --git a/tools/publish.sh b/tools/publish.sh
index 5ed69066..9a4ccc0c 100755
--- a/tools/publish.sh
+++ b/tools/publish.sh
@@ -81,7 +81,11 @@ tools=(
     cargo-llvm-cov
     cargo-minimal-versions
     parse-changelog
+    cargo-binstall
     cross
+    mdbook
+    mdbook-linkcheck
+    protoc
     nextest
     cargo-nextest
     shellcheck
@@ -89,9 +93,6 @@ tools=(
     valgrind
     wasm-pack
     wasmtime
-    mdbook
-    mdbook-linkcheck
-    cargo-binstall
 )
 
 (