diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index f034af3..0f5d426 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -1,6 +1,6 @@
 # This is a basic workflow to help you get started with Actions
 
-name: CI
+name: ci
 
 # Controls when the action will run. Triggers the workflow on push or pull request
 # events but only for the master branch
@@ -27,20 +27,27 @@ jobs:
       shell: bash
       run: |
         if [[ "${{ matrix.os }}" == macos* ]]; then
-          brew install zsh fish
+          brew install zsh fish shellcheck
         elif [[ "${{ matrix.os }}" == ubuntu* ]]; then
           sudo apt-add-repository -y ppa:fish-shell/release-3
           sudo apt -y update
-          sudo apt -y install zsh fish
+          sudo apt -y install zsh fish shellcheck
         fi
-    - name: Show version info
+
+    - name: Show version
       run: |
-        bash --version
-        zsh --version
-        fish --version
+        bash --version; echo
+        zsh  --version; echo
+        fish --version; echo
+
+    - name: Shellcheck
+      run: shellcheck forgit.plugin.sh
+
     - name: Test bash
       run: bash forgit.plugin.sh
+
     - name: Test zsh
       run: zsh forgit.plugin.zsh
+
     - name: Test fish
       run: fish forgit.plugin.fish
diff --git a/README.md b/README.md
index 7e68eff..84eba63 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 
 <p align="center">
     <a href="https://github.com/wfxr/forgit/actions">
-        <img src="https://github.com/wfxr/forgit/workflows/CI/badge.svg"/>
+        <img src="https://github.com/wfxr/forgit/workflows/ci/badge.svg"/>
     </a>
     <a href="https://img.shields.io/badge/Shell-Bash%20%7C%20Zsh%20%7C%20Fish-blue">
         <img src="https://img.shields.io/badge/Shell-Bash%20%7C%20Zsh%20%7C%20Fish-blue"/>
diff --git a/forgit.plugin.zsh b/forgit.plugin.zsh
index 75e462f..f27b1e7 100755
--- a/forgit.plugin.zsh
+++ b/forgit.plugin.zsh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # MIT (c) Wenxuan Zhang
 forgit::warn() { printf "%b[Warn]%b %s\n" '\e[0;33m' '\e[0m' "$@" >&2; }
 forgit::info() { printf "%b[Info]%b %s\n" '\e[0;32m' '\e[0m' "$@" >&2; }