diff --git a/pre-commit b/pre-commit
index 4437508..1816128 100755
--- a/pre-commit
+++ b/pre-commit
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 set -eo pipefail
 
-var="const currentVersion = '$RANDOM';"
-sed -i "1s/.*/$var/" sw.js
+VAR="const currentVersion = '$RANDOM';"
+sed "1s/.*/$VAR/" sw.js > sw.js.new
+mv sw.js.new sw.js
+git add sw.js
diff --git a/sw.js b/sw.js
index 5c4b358..f9d1018 100644
--- a/sw.js
+++ b/sw.js
@@ -1,4 +1,4 @@
-const currentVersion = 'v1';
+const currentVersion = '12521';
 
 const addResourcesToCache = async (resources) => {
     const cache = await caches.open(currentVersion);