diff --git a/lib/index.js b/lib/index.js
index ef3ceff..4248560 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -13,6 +13,7 @@ const isLocalPath = require('./utils/isLocalPath')
 const SAOError = require('./SAOError')
 const parseGenerator = require('./parseGenerator')
 const updateCheck = require('./updateCheck')
+const store = require('./store')
 
 class SAO {
   /**
@@ -64,11 +65,20 @@ class SAO {
       ? loaded.data
       : require(path.join(__dirname, 'saofile.fallback.js'))
 
-    if (!parent && this.opts.updateCheck) {
-      updateCheck({
-        generator,
-        checkGenerator: config.updateCheck !== false && generator.type === 'npm'
-      })
+    // Only run following code for root generator
+    if (!parent) {
+      if (this.opts.updateCheck) {
+        updateCheck({
+          generator,
+          checkGenerator:
+            config.updateCheck !== false && generator.type === 'npm'
+        })
+      }
+    }
+
+    // When updated, the cached answers should be cleared too
+    if (this.opts.update && generator.hash) {
+      store.delete(`answers.${generator.hash}`)
     }
 
     if (generator.subGenerator) {
@@ -205,7 +215,7 @@ async function ensurePackage(generator, update) {
       'utf8'
     )
     logger.debug('Installing generator at', installPath)
-    await require('./installPackages')({
+    await installPackages({
       cwd: installPath,
       packages: [`${generator.name}@${generator.version || 'latest'}`]
     })