diff --git a/src/mill.ts b/src/mill.ts
index f588f7e7..3d01a55c 100644
--- a/src/mill.ts
+++ b/src/mill.ts
@@ -5,6 +5,11 @@ import * as io from '@actions/io'
 import * as tc from '@actions/tool-cache'
 import * as exec from '@actions/exec'
 
+/**
+ * Installs `Mill` and add its executable to the `PATH`.
+ *
+ * Throws error if the installation fails.
+ */
 export async function install(): Promise<string> {
   try {
     const millVersion = core.getInput('mill-version') || '0.10.9'
@@ -60,3 +65,10 @@ export async function install(): Promise<string> {
   core.info(`✓ Mill installed, version: ${version.trim()}`)
   return version
 }
+
+/**
+ * Removes Mill binary
+ */
+export async function remove(): Promise<void> {
+  await io.rmRF(path.join(path.join(os.homedir(), 'bin'), 'mill'))
+}
diff --git a/src/post.ts b/src/post.ts
index 7f885537..618876ca 100644
--- a/src/post.ts
+++ b/src/post.ts
@@ -1,6 +1,7 @@
 import * as core from '@actions/core'
 import * as workspace from './workspace'
 import * as coursier from './coursier'
+import * as mill from './mill'
 
 /**
  * Performs a cleanup of all the artifacts/folders created by this action.
@@ -11,6 +12,8 @@ async function post(): Promise<void> {
     core.info('🗑 Scala Steward\'s workspace removed')
     await coursier.remove()
     core.info('🗑 Coursier binary removed')
+    await mill.remove()
+    core.info('🗑 Mill binary removed')
   } catch (error: unknown) {
     core.warning((error as Error).message)
   }