diff --git a/dist/index.js b/dist/index.js
index 2d517ce..357c0ba 100644
Binary files a/dist/index.js and b/dist/index.js differ
diff --git a/src/index.ts b/src/index.ts
index 0b7d877..ecea472 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,12 +3,13 @@ import getInputs from './inputs'
 import setOutputs from './outputs'
 import installPnpm from './install-pnpm'
 import pnpmInstall from './pnpm-install'
+import pruneStore from './pnpm-store-prune'
 
 async function main() {
-  const isPost = getState('is_post')
-  if (isPost === 'true') return
-  saveState('is_post', 'true')
   const inputs = getInputs()
+  const isPost = getState('is_post')
+  if (isPost === 'true') return pruneStore(inputs)
+  saveState('is_post', 'true')
   await installPnpm(inputs)
   console.log('Installation Completed!')
   setOutputs(inputs)
diff --git a/src/pnpm-store-prune/index.ts b/src/pnpm-store-prune/index.ts
new file mode 100644
index 0000000..cb45e2c
--- /dev/null
+++ b/src/pnpm-store-prune/index.ts
@@ -0,0 +1,27 @@
+import { spawnSync } from 'child_process'
+import { setFailed } from '@actions/core'
+import { Inputs } from '../inputs'
+
+export function pruneStore(inputs: Inputs) {
+  if (inputs.runInstall.length === 0) {
+    console.log('Pruning is unnecessary.')
+    return
+  }
+
+  console.log('Running pnpm store prune')
+  const { error, status } = spawnSync('pnpm', ['store', 'prune'], {
+    stdio: 'inherit',
+  })
+
+  if (error) {
+    setFailed(error)
+    return
+  }
+
+  if (status) {
+    setFailed(`command pnpm store prune exits with code ${status}`)
+    return
+  }
+}
+
+export default pruneStore