diff --git a/requirements.txt b/requirements.txt
index 49570b8..0f57c0a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 pycocotools
-git+git://github.com/waspinator/pycococreator.git@0.2.0
+cython
+git+https://github.com/waspinator/pycococreator.git@0.2.0
 git+https://github.com/mapillary/inplace_abn.git