diff --git a/package.json b/package.json
index 0d7f8af4..f5ce8093 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "version": "yarn version",
     "build": "./scripts/generate",
     "test": "phantomjs ./src/test/testrunner.js",
-    "deploy": "./scripts/deploy.sh gh-pages 12.0.4",
+    "deploy": "./scripts/deploy.sh gh-pages",
     "prepublish": "run-s version build test deploy"
   },
   "dependencies": {
diff --git a/scripts/deploy.sh b/scripts/deploy.sh
index 09e438f2..d26ab787 100755
--- a/scripts/deploy.sh
+++ b/scripts/deploy.sh
@@ -6,7 +6,8 @@ ROOT=$(
 )
 OUT="$ROOT/dist/"
 PUBLISH_BRANCH=$1
-VERSION=$2
+# For this to work, the version specification must be on the second line of package.json
+VERSION=$(cat "$ROOT/package.json" | sed '2!d' | egrep -o '[0-9]+\.[0-9]+\.[0-9]+')
 
 git fetch --all
 git add -f $OUT