diff --git a/build-wabac.sh b/build-wabac.sh
index 7377c8a3..ba831d23 100755
--- a/build-wabac.sh
+++ b/build-wabac.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
 
-WABAC_SW_URL=https://cdn.jsdelivr.net/npm/@webrecorder/wabac@2.21.3/dist/sw.js
+WABAC_SW_URL=https://cdn.jsdelivr.net/npm/@webrecorder/wabac@2.21.4/dist/sw.js
 
 wget "$WABAC_SW_URL" -O ./pywb/static/wabacWorker.js