diff --git a/__brick__/web/flutter_bootstrap.js b/__brick__/web/flutter_bootstrap.js
index 78069ec..8b15a18 100644
--- a/__brick__/web/flutter_bootstrap.js
+++ b/__brick__/web/flutter_bootstrap.js
@@ -17,16 +17,18 @@ async function readAssets() {
   return assets;
 }
 
+let loadedAssets = 0;
+let totalAssets;
+
 async function beginPreloading() {
   const assets = await readAssets();
 
-  let totalAssets = assets.length;
+  totalAssets = assets.length;
   if (totalAssets === 0) {
     // No assets to load, so we can skip the loading process entirely.
     return;
   }
 
-  let loadedAssets = 0;
   const batchSize = {{batch_size}};
 
   progressIndicator.style.width = '0%';
diff --git a/brick.yaml b/brick.yaml
index 88ac9c7..6c5e727 100644
--- a/brick.yaml
+++ b/brick.yaml
@@ -4,7 +4,7 @@ repository: https://github.com/VeryGoodOpenSource/flutter_web_preloader
 version: 0.4.0
 
 environment:
-  mason: ">=0.1.0-dev.50 <0.1.0"
+  mason: ">=0.1.1 <0.2.0"
 
 vars:
   project_title:
diff --git a/hooks/pubspec.yaml b/hooks/pubspec.yaml
index ea847c1..34551a8 100644
--- a/hooks/pubspec.yaml
+++ b/hooks/pubspec.yaml
@@ -4,7 +4,7 @@ environment:
   sdk: ">=2.17.0 <3.0.0"
 
 dependencies:
-  mason: ^0.1.0-dev.50
+  mason: ^0.1.1
   yaml: ^3.1.1
 
 dev_dependencies: