diff --git a/tdd-roman-numerals-kata/package-lock.json b/tdd-roman-numerals-kata/package-lock.json
index 9691bfe..62d7ef1 100644
--- a/tdd-roman-numerals-kata/package-lock.json
+++ b/tdd-roman-numerals-kata/package-lock.json
@@ -468,9 +468,9 @@
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-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
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+      "version": "5.7.4",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.4.tgz",
+      "integrity": "sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==",
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@@ -484,9 +484,9 @@
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-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.1.tgz",
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+          "version": "6.4.1",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
+          "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
           "dev": true
         }
       }