diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index b6e750ba3..6842acbeb 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 5.19.3
+current_version = 5.19.4.dev0
 commit = True
 tag = True
 sign_tags = True
diff --git a/src/omero_version.py b/src/omero_version.py
index 267354489..9405db81b 100644
--- a/src/omero_version.py
+++ b/src/omero_version.py
@@ -1,3 +1,3 @@
-omero_version = "5.19.3"
+omero_version = "5.19.4.dev0"
 ice_compatibility = "3.6.5"
 build_year = "2023"