diff --git a/pyproject.toml b/pyproject.toml
index 69eded8f..c9fc7569 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ dependencies = [
     "pywin32; platform_system == 'Windows'",
 ]
 description = "API for DE Server"
-version = "5.3.1"
+version = "5.4.0b1"
 keywords = [
     "EELS",
     "STEM",