diff --git a/.gitignore b/.gitignore
index 80a536ca..881a5eea 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,11 @@ pids
 *.seed
 *.pid.lock
 
+# Ignore master key for decrypting credentials and more.
+/config/master.key
+/config/database.yml
+/.idea/*
+
 # Directory for instrumented libs generated by jscoverage/JSCover
 lib-cov