diff --git a/setup.py b/setup.py
index c831777..08ffab3 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@ def read_long_description(filename="README.rst"):
     long_description=read_long_description(),
     install_requires=[
         'tchannel>=1.0.1',
-        'zest.releaser==6.5',
+        'zest.releaser>=6.0,<7.0',
         'crcmod',
         'clay-flask',
         'PyYAML',
@@ -64,4 +64,4 @@ def read_long_description(filename="README.rst"):
             'funcsigs==1.0.2',      # via mock
         ],
     }
-)
\ No newline at end of file
+)