diff --git a/.travis.yml b/.travis.yml
index bcd34f9..4a7d09a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 language: node_js
 node_js:
-  - 0.12
-  - 4
-  - 5
+  - 6
+  - 8
+  - 10
 
 before_install:
   - npm install npm@latest -g
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..6c7fff9
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1805 @@
+{
+  "name": "cwise",
+  "version": "1.0.10",
+  "lockfileVersion": 1,
+  "requires": true,
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+      "dev": true,
+      "requires": {
+        "jsonparse": "^1.2.0",
+        "through": ">=2.2.7 <3"
+      }
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+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.4.tgz",
+      "integrity": "sha512-VY4i5EKSKkofY2I+6QLTbTTN/UvEQPCo6eiwzzSaSWfpaDhOmStMCMod6wmuPciNq+XS0faCglFu2lHZpdHUtg=="
+    },
+    "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=="
+    },
+    "acorn-node": {
+      "version": "1.6.2",
+      "resolved": "https://registry.npmjs.org/acorn-node/-/acorn-node-1.6.2.tgz",
+      "integrity": "sha512-rIhNEZuNI8ibQcL7ANm/mGyPukIaZsRNX9psFNQURyJW0nu6k8wjSDld20z6v2mDBWqX13pIEnk9gGZJHIlEXg==",
+      "requires": {
+        "acorn": "^6.0.2",
+        "acorn-dynamic-import": "^4.0.0",
+        "acorn-walk": "^6.1.0",
+        "xtend": "^4.0.1"
+      }
+    },
+    "acorn-walk": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.1.1.tgz",
+      "integrity": "sha512-OtUw6JUTgxA2QoqqmrmQ7F2NYqiBPi/L2jqHyFtllhOUvXYQXf0Z1CYUinIfyT4bTCGmrA7gX9FvHA81uzCoVw=="
+    },
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+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
+      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
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+        "longest": "^1.0.1",
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+      "integrity": "sha1-fajPLiZijtcygDWB/SH2fKzS7uw=",
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+      "resolved": "https://registry.npmjs.org/array-from/-/array-from-2.1.1.tgz",
+      "integrity": "sha1-z+nYwmYoudxa7MYqn12PHzUsEZU="
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+      "resolved": "https://registry.npmjs.org/array-map/-/array-map-0.0.0.tgz",
+      "integrity": "sha1-iKK6tz0c97zVwbEYoAP2b2ZfpmI=",
+      "dev": true
+    },
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+      "resolved": "https://registry.npmjs.org/array-reduce/-/array-reduce-0.0.0.tgz",
+      "integrity": "sha1-FziZ0//Rx9k4PkR5Ul2+J4yrXys=",
+      "dev": true
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+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
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+          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE=",
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+          "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
+          "dev": true,
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+          }
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+      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
+      "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0="
+    },
+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus="
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+    },
+    "yargs": {
+      "version": "3.10.0",
+      "resolved": "http://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
+      "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
+      "requires": {
+        "camelcase": "^1.0.2",
+        "cliui": "^2.1.0",
+        "decamelize": "^1.0.0",
+        "window-size": "0.1.0"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index 135dd54..55586e3 100644
--- a/package.json
+++ b/package.json
@@ -8,15 +8,16 @@
     "test": "test"
   },
   "dependencies": {
-    "cwise-parser": "^1.0.0",
-    "cwise-compiler": "^1.1.1",
-    "static-module": "^1.0.0",
-    "uglify-js": "^2.6.0"
+    "cwise-compiler": "^1.1.3",
+    "cwise-parser": "^1.0.3",
+    "static-module": "^3.0.0",
+    "uglify-js": "^2.8.29"
   },
   "devDependencies": {
-    "ndarray": "^1.0.13",
-    "browserify": "^13.0.0",
-    "tape": "^4.0.0"
+    "acorn": "^6.0.4",
+    "ndarray": "^1.0.18",
+    "browserify": "^16.2.3",
+    "tape": "^4.9.1"
   },
   "scripts": {
     "test": "tape test/*.js",
diff --git a/test/fill.js b/test/fill.js
index 10672b5..b1d90c8 100644
--- a/test/fill.js
+++ b/test/fill.js
@@ -10,7 +10,7 @@ test("fill", function(t) {
   var fill = cwise({
     args: ["index", "array", "scalar"],
     body: function(idx, out, f) {
-      out = f.apply(undefined, idx)
+      out = f.apply(null, idx)
     }
   })