diff --git a/requirements-mceditlib.txt b/requirements-mceditlib.txt
index 037830e..49d3c3c 100644
--- a/requirements-mceditlib.txt
+++ b/requirements-mceditlib.txt
@@ -1,3 +1,3 @@
-cython
+cython==0.26
 numpy
 arrow
\ No newline at end of file