diff --git a/cython/requirements.txt b/cython/requirements.txt
index 3fdf1a7b8..cd77b097d 100644
--- a/cython/requirements.txt
+++ b/cython/requirements.txt
@@ -1,3 +1,3 @@
-Cython>=-0.25.2
+Cython>=0.25.2
 backports_abc>=0.5
 numpy>=1.12.0