diff --git a/.flowconfig b/.flowconfig
index de8b8f6..267709e 100644
--- a/.flowconfig
+++ b/.flowconfig
@@ -8,6 +8,5 @@ types/types.js
 
 [options]
 esproposal.export_star_as=enable
-unsafe.enable_getters_and_setters=true
 module.system.node.resolve_dirname=node_modules
 module.system.node.resolve_dirname=src
diff --git a/.travis.yml b/.travis.yml
index 23cd14c..3687c35 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,8 @@
 language: node_js
 node_js:
-  - 7
+  - 6
   - 8
+  - 9
 script:
   - yarn travis
 cache: