diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 5d31da1fb..e3f1414b2 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.25.1
+current_version = 1.0.0rc1
 commit = True
 tag = True
 tag_name = {new_version}
@@ -14,7 +14,7 @@ serialize =
 
 [bumpversion:part:prerel]
 optional_value = gamma
-values =
+values = 
 	dev
 	rc
 	gamma
diff --git a/scrapy/VERSION b/scrapy/VERSION
index af2dabf3f..6a056a8b1 100644
--- a/scrapy/VERSION
+++ b/scrapy/VERSION
@@ -1 +1 @@
-0.25.1
+1.0.0rc1