diff --git a/pyproject.toml b/pyproject.toml
index dbc0daf..363f111 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ testpaths = [
 
 [tool.poetry]
 name = "pos"
-version = "3.1.0"
+version = "4.0.0"
 description = "A Part-of-Speech tagger for Icelandic"
 authors = ["Haukur <haukurpalljonsson@gmail.com>"]
 license = "Apache-2.0"