diff --git a/luigi/requirements.txt b/luigi/requirements.txt
old mode 100755
new mode 100644
index 74dca85..eb6f1e1
--- a/luigi/requirements.txt
+++ b/luigi/requirements.txt
@@ -54,7 +54,7 @@ pathos==0.2.1
 patsy==0.4.1
 pexpect==4.2.1
 pickleshare==0.7.4
-Pillow==4.3.0
+Pillow==8.1.1
 pox==0.2.3
 ppft==1.6.4.7.1
 prompt-toolkit==1.0.15