diff --git a/.travis.yml b/.travis.yml
index 7fd9181f..37480ba2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: node_js
 node_js:
+  - 0.12
   - 4
   - 6
   - 8
diff --git a/HISTORY.md b/HISTORY.md
index 14f949ec..ae3acaa1 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,13 @@
+<a name="1.0.9"></a>
+## [1.0.9](https://github.com/mongodb/js-bson/compare/v1.0.8...v1.0.9) (2018-06-07)
+
+
+### Bug Fixes
+
+* **serializer:** remove use of `const` ([5feb12f](https://github.com/mongodb/js-bson/commit/5feb12f))
+
+
+
 <a name="1.0.7"></a>
 ## [1.0.7](https://github.com/mongodb/js-bson/compare/v1.0.6...v1.0.7) (2018-06-06)
 
diff --git a/lib/bson/parser/serializer.js b/lib/bson/parser/serializer.js
index 820bd089..12c6b2d3 100644
--- a/lib/bson/parser/serializer.js
+++ b/lib/bson/parser/serializer.js
@@ -6,7 +6,7 @@ var writeIEEE754 = require('../float_parser').writeIEEE754,
   Map = require('../map'),
   Binary = require('../binary').Binary;
 
-const normalizedFunctionString = require('./utils').normalizedFunctionString;
+var normalizedFunctionString = require('./utils').normalizedFunctionString;
 
 // try {
 //   var _Buffer = Uint8Array;
diff --git a/package.json b/package.json
index e99dba54..da342c5d 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "browser_build",
     "bower.json"
   ],
-  "version": "1.0.8",
+  "version": "1.0.9",
   "author": "Christian Amor Kvalheim <christkv@gmail.com>",
   "contributors": [],
   "repository": "mongodb/js-bson",