diff --git a/Gemfile.lock b/Gemfile.lock
index 0b6f31ab..7c44d71b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    mailcatcher (0.6.0)
+    mailcatcher (0.6.0pre1)
       activesupport (>= 4.0.0, < 5)
       eventmachine (~> 1.0.0, != 1.0.4)
       mail (~> 2.3)
diff --git a/lib/mail_catcher/version.rb b/lib/mail_catcher/version.rb
index 850eb90a..2f1dfec8 100644
--- a/lib/mail_catcher/version.rb
+++ b/lib/mail_catcher/version.rb
@@ -1,3 +1,3 @@
 module MailCatcher
-  VERSION = "0.6.0"
+  VERSION = "0.6.0pre1"
 end