diff --git a/src/action/action.ts b/src/action/action.ts
index 801d090..a90a1ec 100644
--- a/src/action/action.ts
+++ b/src/action/action.ts
@@ -124,11 +124,14 @@ export class Action {
   }
 
   async downloadDiskImage(): Promise<string> {
+    const image_url = this.operatingSystem.virtualMachineImageUrl
+    if this.input.image_url !== '' {
+      image_url = this.input.image_url
+    }
     core.info(
-      `Downloading disk image: ${this.operatingSystem.virtualMachineImageUrl}`
+      `Downloading disk image: ${image_url}`
     )
-    const result = await cache.downloadTool(
-      this.operatingSystem.virtualMachineImageUrl
+    const result = await cache.downloadTool(image_url)
     )
     core.info(`Downloaded file: ${result}`)
 
diff --git a/src/action/input.ts b/src/action/input.ts
index 589bd4e..7080296 100644
--- a/src/action/input.ts
+++ b/src/action/input.ts
@@ -7,6 +7,7 @@ export class Input {
   private run_?: string
   private operatingSystem_?: os.Kind
   private version_?: string
+  private image_url_?: string
   private shell_?: Shell
   private environmentVariables_?: string
   private architecture_?: architecture.Kind
@@ -18,6 +19,13 @@ export class Input {
     }))
   }
 
+  get image_url(): string {
+    if (this.image_url_ !== undefined) return this.image_url_
+    const input = core.getInput('image_url')
+    const image_url = input ? input : ''
+    return (this.image_url = image_url)
+  }
+
   get operatingSystem(): os.Kind {
     if (this.operatingSystem_ !== undefined) return this.operatingSystem_
     const input = core.getInput('operating_system', {required: true})