diff --git a/firefox/build-package.py b/firefox/build-package.py
index e0121a6..9c6a70a 100644
--- a/firefox/build-package.py
+++ b/firefox/build-package.py
@@ -27,7 +27,7 @@ for key, value in switcher.items():
 #Hard coded values
 package['name'] = package['title'].replace(' ', '-').lower()
 package['id'] = package['name'] + "@jetpack"
-package['engines'] = {'fennec': ">=38.01a", 'firefox': ">=38.0a1"}
+package['engines'] = {'fennec': "45.0", 'firefox': "45.0"}
 package['main'] = 'index.js'
 
 with open(current_dir + 'package.json', 'w') as file:
diff --git a/scripts/build-js.sh b/scripts/build-js.sh
index cba64c0..c86ae64 100644
--- a/scripts/build-js.sh
+++ b/scripts/build-js.sh
@@ -9,4 +9,5 @@ uglifyjs "build/global.js" --compress --screw-ie8 --define --keep-fnames -o buil
 for f in src/injections/*; do uglifyjs "build/global.js" "src/lib/jquery.js" $f --compress --screw-ie8 --define --stats --keep-fnames -o build/$f; done
 
 cp -rp build/src/* build/
-rm -rf build/src
\ No newline at end of file
+rm -rf build/src
+rm -rf build/lib
\ No newline at end of file