diff --git a/.travis.yml b/.travis.yml
index e25a8c4..20bfe6e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,12 @@
 language: node_js
 node_js:
+  - "node"
+  - "14"
+  - "13"
+  - "12"
+  - "11"
+  - "10"
+  - "9"
   - "9"
   - "8"
   - "6"
diff --git a/README.md b/README.md
index c36f7ec..57a05ed 100644
--- a/README.md
+++ b/README.md
@@ -138,7 +138,7 @@ content = serializer.serialize({
 ## Changelog
 
 ### 2.1.2
-* Fixed prototype pollution by ignoring `constructor`
+* Fixed prototype pollution by ignoring `constructor` and `prototype`
 
 ### 2.1.1
 * Fixed prototype pollution by ignoring `__proto__`