diff --git a/opentech/static_src/package.json b/opentech/static_src/package.json
index 1fa97be23b5b125164439e0e72592540e7df3968..a661a4c617127130bae3bd603be9588055c599d9 100755
--- a/opentech/static_src/package.json
+++ b/opentech/static_src/package.json
@@ -97,7 +97,7 @@
     "sass-lint": "^1.12.1"
   },
   "engines": {
-    "node": ">=7.0.0"
+    "node": "8.11.3"
   },
   "dependencies": {
     "@fancyapps/fancybox": "^3.2.5"
diff --git a/package.json b/package.json
index 01931fffeeae169ab7dfb3347a8f27dc62c4d0c8..bc2f2aa41946fd0f2034f5078c8a3d3ca9a9ea9a 100644
--- a/package.json
+++ b/package.json
@@ -4,9 +4,10 @@
     "description": "Build the static src.",
     "cacheDirectories": ["client/node_modules"],
     "scripts": {
-      "postinstall": "cd opentech/static_src && yarn install && npm build:prod"
+        "postinstall": "cd opentech/static_src && yarn install && npm run build:prod"
     },
     "engines": {
-    "yarn": ">=1.7.0"
+        "node": "8.11.3",
+        "yarn": "1.7.0"
     }
 }