diff --git a/package-lock.json b/package-lock.json
index 9e0666b6..55cf5fd2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1870,9 +1870,9 @@
       }
     },
     "deep-extend": {
-      "version": "0.5.1",
-      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.5.1.tgz",
-      "integrity": "sha512-N8vBdOa+DF7zkRrDCsaOXoCs/E2fJfx9B9MrKnnSiHNh4ws7eSys6YQE4KvT1cecKmOASYQBhbKjeuDD9lT81w=="
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
+      "integrity": "sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA=="
     },
     "deep-is": {
       "version": "0.1.3",
diff --git a/package.json b/package.json
index 72b40584..c493685d 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
   "homepage": "https://github.com/igorshubovych/markdownlint-cli#readme",
   "dependencies": {
     "commander": "~2.9.0",
-    "deep-extend": "~0.5.1",
+    "deep-extend": "~0.6.0",
     "get-stdin": "~8.0.0",
     "glob": "~7.1.2",
     "ignore": "~5.1.4",