diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 2d57bfa..d39a204 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 1.3.4
+current_version = 1.4.0
 commit = True
 tag = False
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(\-(?P<release>[a-z]+)(?P<build>\d+))?
diff --git a/VERSION b/VERSION
index d0149fe..88c5fb8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.3.4
+1.4.0
diff --git a/setup.cfg b/setup.cfg
index 1d78f3b..71bf296 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = sse-starlette
-version = 1.3.4
+version = 1.4.0
 description = "SSE plugin for Starlette"
 long_description = file: README.md, LICENSE
 long_description_content_type = text/markdown
diff --git a/sse_starlette/__init__.py b/sse_starlette/__init__.py
index 1aaa6d5..78fdcc0 100644
--- a/sse_starlette/__init__.py
+++ b/sse_starlette/__init__.py
@@ -1,4 +1,4 @@
 from sse_starlette.sse import EventSourceResponse, ServerSentEvent
 
 __all__ = ["ServerSentEvent", "EventSourceResponse"]
-__version__ = "1.3.4"
+__version__ = "1.4.0"