diff --git a/pastastore/version.py b/pastastore/version.py
index 908a26e..79e477d 100644
--- a/pastastore/version.py
+++ b/pastastore/version.py
@@ -9,7 +9,7 @@
 PASTAS_LEQ_022 = PASTAS_VERSION <= parse_version("0.22.0")
 PASTAS_GEQ_150 = PASTAS_VERSION >= parse_version("1.5.0")
 
-__version__ = "1.8.0"
+__version__ = "1.9.0.dev0"
 
 
 def show_versions(optional=False) -> None: