diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..a678112
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1380 @@
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+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-7.0.0.tgz",
+          "integrity": "sha1-jQrELxbqVd69MyyvTEA4s+P139k=",
+          "requires": {
+            "camelcase": "4.1.0"
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index 27450de..b112586 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mathjax-node-page",
-  "version": "1.3.1",
+  "version": "1.3.2",
   "description": "Converter for HTML fragments with mathematics using mathjax-node",
   "main": "./lib/main.js",
   "scripts": {
@@ -29,7 +29,7 @@
   "homepage": "https://github.com/pkra/mathjax-node-page#readme",
   "dependencies": {
     "mathjax-node": "^1.0.0",
-    "yargs": "*"
+    "yargs": "^9"
   },
   "devDependencies": {
     "tape": "^4.5.1"