diff --git a/Makefile b/Makefile
index 32978c3..3e138d4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-short_ver = 3.1.1
+short_ver = 4.0.0
 release = 1
 PYTHON ?= python3
 PYTHON_DIRS = aiven tests