diff --git a/workspaces/arborist/test/fixtures/tap-with-yarn-lock/node_modules/uglify-js/package.json b/workspaces/arborist/test/fixtures/tap-with-yarn-lock/node_modules/uglify-js/package.json
index f67fdb33fb208..2bc2190bd632f 100644
--- a/workspaces/arborist/test/fixtures/tap-with-yarn-lock/node_modules/uglify-js/package.json
+++ b/workspaces/arborist/test/fixtures/tap-with-yarn-lock/node_modules/uglify-js/package.json
@@ -24,7 +24,7 @@
   ],
   "dependencies": {
     "commander": "~2.20.0",
-    "source-map": "~0.6.1"
+    "source-map": "~0.7.4"
   },
   "devDependencies": {
     "acorn": "~6.1.1",