diff --git a/chapter7/quorum-examples/examples/7nodes/package-lock.json b/chapter7/quorum-examples/examples/7nodes/package-lock.json
index 1c9203d..a80113c 100644
--- a/chapter7/quorum-examples/examples/7nodes/package-lock.json
+++ b/chapter7/quorum-examples/examples/7nodes/package-lock.json
@@ -933,12 +933,12 @@
     "fstream": {
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/fstream/-/fstream-1.0.11.tgz",
-      "integrity": "sha1-XB+x8RdHcRTwYyoOtLcbPLD9MXE=",
+      "integrity": "sha512-2Xg8XA70uvyriqd1J6T/6V74WeQWHCn65hTSAWcZgKCOCo7nN6hoqgFrYPLJ9Yzbryrp/VIruHXsDyZIqZ1SvQ==",
       "requires": {
-        "graceful-fs": "4.1.11",
-        "inherits": "2.0.3",
-        "mkdirp": "0.5.1",
-        "rimraf": "2.6.2"
+        "graceful-fs": "^4.1.2",
+        "inherits": "~2.0.0",
+        "mkdirp": ">=0.5 0",
+        "rimraf": "2"
       }
     },
     "get-stream": {