diff --git a/README.md b/README.md
index bc84052..67c2da8 100644
--- a/README.md
+++ b/README.md
@@ -80,6 +80,10 @@ config:
       - another-excluded-func
 ```
 
+#### `layer_arn` (optional)
+
+Pin to a specific layer version. The latest layer ARN is automatically fetched from the [IOpipe Layers API](https://layers.iopipe.com)
+
 #### `prepend` (optional)
 
 Whether or not to prepend the IOpipe layer. Defaults to `false` which appends the layer.
@@ -116,4 +120,4 @@ When using with the [Serverless Enterprise Plugin](https://github.com/serverless
 
 ## License
 
-Apache 2.0
\ No newline at end of file
+Apache 2.0
diff --git a/src/index.ts b/src/index.ts
index 5f74172..1fd1134 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -126,7 +126,8 @@ export default class IOpipeLayerPlugin {
       return;
     }
 
-    const layerArn = await this.getLayerArn(runtime, region);
+    const layerArn = this.config.layer_arn ? this.config.layer_arn : await this.getLayerArn(runtime, region);
+
     const iopipeLayers = layers.filter(
       layer => typeof layer === "string" && layer.match(layerArn)
     );