diff --git a/Gemfile.lock b/Gemfile.lock
index 925ac247f..1fa11411b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rbs (3.3.2)
+    rbs (3.4.0.dev)
       abbrev
 
 PATH
diff --git a/lib/rbs/version.rb b/lib/rbs/version.rb
index e32846724..00b63a4c3 100644
--- a/lib/rbs/version.rb
+++ b/lib/rbs/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module RBS
-  VERSION = "3.3.2"
+  VERSION = "3.4.0.dev"
 end