diff --git a/chapter7/quorum-examples/examples/7nodes/package-lock.json b/chapter7/quorum-examples/examples/7nodes/package-lock.json
index 1c9203d..d0cbb48 100644
--- a/chapter7/quorum-examples/examples/7nodes/package-lock.json
+++ b/chapter7/quorum-examples/examples/7nodes/package-lock.json
@@ -111,8 +111,8 @@
       "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
       "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
       "requires": {
-        "readable-stream": "2.3.6",
-        "safe-buffer": "5.1.2"
+        "readable-stream": "^2.3.5",
+        "safe-buffer": "^5.1.1"
       }
     },
     "block-stream": {