diff --git a/packages/workbox-build/package-lock.json b/packages/workbox-build/package-lock.json
index 47371f9a6..6cdd80c54 100644
--- a/packages/workbox-build/package-lock.json
+++ b/packages/workbox-build/package-lock.json
@@ -268,11 +268,18 @@
 			"integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg=="
 		},
 		"workbox-background-sync": {
-			"version": "4.1.0",
-			"resolved": "https://registry.npmjs.org/workbox-background-sync/-/workbox-background-sync-4.1.0.tgz",
-			"integrity": "sha512-1MRuptIw30i0T7GmwGTMq84zG/A7NXmqagh+MJAoufj2Fk9SGq//HlImyIvNyeqyh6uR6Y2QIbXajbh19PsYSQ==",
+			"version": "4.3.1",
+			"resolved": "https://registry.npmjs.org/workbox-background-sync/-/workbox-background-sync-4.3.1.tgz",
+			"integrity": "sha512-1uFkvU8JXi7L7fCHVBEEnc3asPpiAL33kO495UMcD5+arew9IbKW2rV5lpzhoWcm/qhGB89YfO4PmB/0hQwPRg==",
 			"requires": {
-				"workbox-core": "^4.1.0"
+				"workbox-core": "^4.3.1"
+			},
+			"dependencies": {
+				"workbox-core": {
+					"version": "4.3.1",
+					"resolved": "https://registry.npmjs.org/workbox-core/-/workbox-core-4.3.1.tgz",
+					"integrity": "sha512-I3C9jlLmMKPxAC1t0ExCq+QoAMd0vAAHULEgRZ7kieCdUd919n53WC0AfvokHNwqRhGn+tIIj7vcb5duCjs2Kg=="
+				}
 			}
 		},
 		"workbox-broadcast-update": {
diff --git a/packages/workbox-build/package.json b/packages/workbox-build/package.json
index 0fff39d67..07cecdc41 100644
--- a/packages/workbox-build/package.json
+++ b/packages/workbox-build/package.json
@@ -29,7 +29,7 @@
     "pretty-bytes": "^5.1.0",
     "stringify-object": "^3.3.0",
     "strip-comments": "^1.0.2",
-    "workbox-background-sync": "^4.1.0",
+    "workbox-background-sync": "^4.3.1",
     "workbox-broadcast-update": "^4.1.0",
     "workbox-cacheable-response": "^4.1.0",
     "workbox-core": "^4.1.0",