diff --git a/pyproject.toml b/pyproject.toml
index 4d7fe94..8e6f2a3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name         = "prymer"
-version      = "2.1.1"
+version      = "2.2.0"
 description  = "Python primer design library"
 readme       = "README.md"
 authors      = [