diff --git a/setup.cfg b/setup.cfg
index d8d9c23..522acf4 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -24,4 +24,4 @@ package_dir =
     = src
 
 [options.extras_require]
-unzer = unzer~=1.0.0.dev3
+unzer = unzer~=1.0.0.dev4