diff --git a/lib/irb/version.rb b/lib/irb/version.rb
index 7d83421b2b..28c888ca68 100644
--- a/lib/irb/version.rb
+++ b/lib/irb/version.rb
@@ -11,7 +11,7 @@
 #
 
 module IRB # :nodoc:
-  VERSION = "1.3.7"
+  VERSION = "1.3.8.pre.1"
   @RELEASE_VERSION = VERSION
-  @LAST_UPDATE_DATE = "2021-08-12"
+  @LAST_UPDATE_DATE = "2021-08-29"
 end