diff --git a/package-lock.json b/package-lock.json
index 321d052..2fc6a71 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,9 +5,15 @@
   "requires": true,
   "dependencies": {
     "acorn": {
-      "version": "5.7.3",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
-      "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.1.tgz",
+      "integrity": "sha512-jPTiwtOxaHNaAPg/dmrJ/beuzLRnXtB0kQPQ8JpotKJgTB6rX6c8mlf315941pyjBSaPg8NHXS9fhP4u17DpGA==",
+      "dev": true
+    },
+    "acorn-dynamic-import": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-dynamic-import/-/acorn-dynamic-import-4.0.0.tgz",
+      "integrity": "sha512-d3OEjQV4ROpoflsnUA8HozoIR504TFxNivYEUi6uwz0IYhBkTDXGuWlNdMtybRt3nqVx/L6XqMt0FxkXuWKZhw==",
       "dev": true
     },
     "balanced-match": {
@@ -249,19 +255,20 @@
       "dev": true
     },
     "reify": {
-      "version": "0.18.1",
-      "resolved": "https://registry.npmjs.org/reify/-/reify-0.18.1.tgz",
-      "integrity": "sha512-eNiNGxo5Cz/s/7DOeQW5+lTAxMexZPFA8XW/ef6f8WBLtQfYAhDNXxva7ROFC/Wa3q91usYzqJYwC85OXaWUzA==",
+      "version": "0.19.1",
+      "resolved": "https://registry.npmjs.org/reify/-/reify-0.19.1.tgz",
+      "integrity": "sha512-Gt5EoUWsGqqfj8gB9rxIvToROBCnjtheYfL94gfEWYI3F8Uy128OiklYArJSK0JFDTdeLtiNTr4HB5fg7VKe5g==",
       "dev": true,
       "requires": {
-        "acorn": "^5.5.3",
+        "acorn": "^6.1.1",
+        "acorn-dynamic-import": "^4.0.0",
         "semver": "^5.4.1"
       }
     },
     "semver": {
-      "version": "5.6.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-5.6.0.tgz",
-      "integrity": "sha512-RS9R6R35NYgQn++fkDWaOmqGoj4Ek9gGs+DPxNUZKuwE183xjJroKvyo1IzVFeXvUrvmALy6FWD5xrdJT25gMg==",
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+      "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
       "dev": true
     },
     "source-map": {
diff --git a/package.json b/package.json
index d7cac25..cc08767 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
   "devDependencies": {
     "docco": "^0.8.0",
     "mocha": "^5.0.0",
-    "reify": "^0.18.1",
+    "reify": "^0.19.1",
     "terser": "^3.16.0"
   },
   "license": "MIT",