diff --git a/VERSION b/VERSION
index 6a36bb4..7ac4e5e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.1.12
\ No newline at end of file
+0.1.13
diff --git a/python/orgasm/version.py b/python/orgasm/version.py
index 33a5b73..7ad5a35 100644
--- a/python/orgasm/version.py
+++ b/python/orgasm/version.py
@@ -1,5 +1,5 @@
 major = 0
 minor = '1'
-serial= '12'
+serial= '13'
 
 version = "%d.%s.%s" % (major,minor,serial)
diff --git a/requirements.txt b/requirements.txt
index 1b8865d..78c5a3b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 --extra-index-url https://pypi.python.org/simple/
 pip>=8.0
-Cython>=0.23
+Cython==0.23
 Sphinx>=1.3