diff --git a/.gitignore b/.gitignore
index 0ac606f..2d8d77e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .nyc_output/
 coverage/
 node_modules/
+package-lock.json
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index f17db43..0000000
--- a/package-lock.json
+++ /dev/null
@@ -1,3545 +0,0 @@
-{
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-      "integrity": "sha1-9pPymjFbUNmp2iZGp6ZkXJaYW2o=",
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-        "require-directory": "^2.1.1",
-        "require-main-filename": "^2.0.0",
-        "set-blocking": "^2.0.0",
-        "string-width": "^3.0.0",
-        "which-module": "^2.0.0",
-        "y18n": "^4.0.0",
-        "yargs-parser": "^13.1.1"
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-            "is-fullwidth-code-point": "^2.0.0",
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-      "requires": {
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-        "decamelize": "^1.2.0"
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-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
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-      "dev": true
-    }
-  }
-}
diff --git a/package.json b/package.json
index 97ad7fb..dcbf044 100644
--- a/package.json
+++ b/package.json
@@ -18,13 +18,13 @@
   "devDependencies": {
     "mkdirp": "^0.5.0",
     "rimraf": "^2.6.2",
-    "tap": "^14.6.9"
+    "tap": "^16.0.1"
   },
   "scripts": {
     "test": "tap",
     "preversion": "npm test",
     "postversion": "npm publish",
-    "prepublish": "npm run changelog",
+    "prepublishOnly": "npm run changelog",
     "prechangelog": "bash gen-changelog.sh",
     "changelog": "git add CHANGELOG.md",
     "postchangelog": "git commit -m 'update changelog - '${npm_package_version}",
diff --git a/test/basic.js b/test/basic.js
index 4bbfa8b..c656fa5 100644
--- a/test/basic.js
+++ b/test/basic.js
@@ -40,7 +40,7 @@ t.test('does not find non-executable', skip, function (t) {
   t.test('absolute', function (t) {
     t.plan(3)
     which(fixture + '/foo.sh', function (er) {
-      t.isa(er, Error)
+      t.type(er, Error)
       t.equal(er.code, 'ENOENT')
     })
 
@@ -52,7 +52,7 @@ t.test('does not find non-executable', skip, function (t) {
   t.test('with path', function (t) {
     t.plan(3)
     which('foo.sh', { path: fixture }, function (er) {
-      t.isa(er, Error)
+      t.type(er, Error)
       t.equal(er.code, 'ENOENT')
     })
 
diff --git a/test/bin.js b/test/bin.js
index bf19e16..fccd24c 100644
--- a/test/bin.js
+++ b/test/bin.js
@@ -96,7 +96,7 @@ t.test('cli flags', function (t) {
           if (process.platform === 'win32') {
             opt.skip = 'windows does not have builtin "which"'
           }
-          t.ok(out.length > 1, 'should have more than 1 result', opt)
+          t.ok(out.length > 0, 'should have a result', opt)
         }
         t.end()
       })