diff --git a/GPy/__version__.py b/GPy/__version__.py
index 8c0d5d5b..5becc17c 100644
--- a/GPy/__version__.py
+++ b/GPy/__version__.py
@@ -1 +1 @@
-__version__ = "2.0.0"
+__version__ = "1.0.0"
diff --git a/setup.cfg b/setup.cfg
index 8d9ecca7..d393931e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [bumpversion]
-current_version = 2.0.0
-tag = True
+current_version = 1.0.0
+tag = False
 commit = True
 
 [bumpversion:file:GPy/__version__.py]