diff --git a/requirements.txt b/requirements.txt
index e0896648a3c8..1c07c651150e 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,6 +25,6 @@ pandas
 # scikit-learn==0.19.2  # for coreml quantization
 
 # extras --------------------------------------
-thop  # FLOPS computation
-Cython  # for pycocotools https://github.com/cocodataset/cocoapi/issues/172
+# Cython  # for pycocotools https://github.com/cocodataset/cocoapi/issues/172
 pycocotools>=2.0  # COCO mAP
+thop  # FLOPS computation