diff --git a/requirements.txt b/requirements.txt
index 8086342..8bffa06 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-numpy==1.16.1
+numpy==1.22.0
 chainer==6.0.0b3
 gym==0.10.5
 chainerrl==0.6.0