diff --git a/kokoro/gcp_ubuntu/requirements.txt b/kokoro/gcp_ubuntu/requirements.txt
index db17f0a1d..0fad74f84 100644
--- a/kokoro/gcp_ubuntu/requirements.txt
+++ b/kokoro/gcp_ubuntu/requirements.txt
@@ -1,6 +1,6 @@
 # pip requirements generated from pypi
 pip==26.1.2 --hash=sha256:382ff9f685ee3bc25864f820aa50505825f10f5458ffff07e30a6d96e5715cab --hash=sha256:f49cd134c61cf2fd75e0ce2676db03e4054504a5a4986d00f8299ae632dc4605
-virtualenv==20.36.1 --hash=sha256:575a8d6b124ef88f6f51d56d656132389f961062a9177016a50e4f507bbcc19f --hash=sha256:8befb5c81842c641f8ee658481e42641c68b5eab3521d8e092d18320902466ba
+virtualenv==21.7.13 --hash=sha256:0355558b6f33619aab31347e43643b0ebc97f61ea3acf617b2b69e1f8a843d11 --hash=sha256:1bea5af7463f59c4719db48fe739579a2a4f569c96f26c086edda85c96da9f59
 distlib==0.3.8 --hash=sha256:034db59a0b96f8ca18035f36290806a9a6e6bd9d1ff91e45a7f172eb17e51784
 filelock==3.20.3 --hash=sha256:18c57ee915c7ec61cff0ecf7f0f869936c7c30191bb0cf406f1341778d0834e1 --hash=sha256:4b0dda527ee31078689fc205ec4f1c1bf7d56cf88b6dc9426c4f230e46c2dce1
 platformdirs==4.2.2 --hash=sha256:2d7a1657e36a80ea911db832a8a6ece5ee53d8de21edd5cc5879af6530b1bfee