diff --git a/CHANGELOG.md b/CHANGELOG.md
index e77f91f0ba4a5c0a6e62b78a0af34f2bc1d93c63..4229acb79959ddd470c72f02c60ac9088b99bd36 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,9 @@
 Changelog
 =========
 
+Unreleased
+----------
+
 [1.3.0] (2024-02-15)
 --------------------
 
diff --git a/pyproject.toml b/pyproject.toml
index 6b40597a92e7466be967f2fc0982def0348bf36d..99ebae2c4a4b9e3c3d732a047f69e23626246ca9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "whisper-asr-webservice"
-version = "1.3.0"
+version = "1.4.0-dev"
 description = "Whisper ASR Webservice is a general-purpose speech recognition webservice."
 homepage  = "https://github.com/ahmetoner/whisper-asr-webservice/"
 license = "https://github.com/ahmetoner/whisper-asr-webservice/blob/main/LICENCE"