diff --git a/requirements.txt b/requirements.txt
index d935ea6b..a4684389 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ torch >= 1.4
 matplotlib
 pycocotools
 tqdm
-Pillow
+pillow
 
 # Nvidia Apex (optional) for mixed precision training --------------------------
 # git clone https://github.com/NVIDIA/apex && cd apex && pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" . --user && cd .. && rm -rf apex