diff --git a/README.md b/README.md
index 23b59995478741241ebf3725e08fc5d47aa91430..7cadbbe37a8d7c283464469f6bf1e3723c00b0d9 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ Then copy your resulting wheel and install it via pip on the target system.
 
 ## v0.6.1
 
-* _TBA_
+* fixed an issue with `Iterators`
 
 ## v0.6
 
diff --git a/setup.cfg b/setup.cfg
index c62a64cac3d29a6d6c8459e351966e991fc9e93e..1ba3bf569c86d15b2c95089cb77cf8ac870ef8a7 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,7 +1,7 @@
 # coding: utf-8
 [metadata]
 name = tempsdb
-version = 0.6.1a1
+version = 0.6.1
 long-description = file: README.md
 long-description-content-type = text/markdown; charset=UTF-8
 license_files = LICENSE
diff --git a/tempsdb/iterators.pyx b/tempsdb/iterators.pyx
index f0a0f4df8653f3de813fcb93b69b2d8e4d299f19..1aff3147c65fad93642a86a9f3792603752c44a8 100644
--- a/tempsdb/iterators.pyx
+++ b/tempsdb/iterators.pyx
@@ -27,7 +27,7 @@ cdef class Iterator:
     :meth:`~tempsdb.iterators.Iterator.close`.
     """
 
-    def __init__(self, TimeSeries parent, int start, int stop, list chunks):
+    def __init__(self, TimeSeries parent, unsigned long long start, unsigned long long stop, list chunks):
         self.start = start
         self.stop = stop
         self.current_chunk = None