diff --git a/.kokoro/requirements.txt b/.kokoro/requirements.txt
index 0a1623fe..e24dcf6d 100644
--- a/.kokoro/requirements.txt
+++ b/.kokoro/requirements.txt
@@ -602,9 +602,9 @@ urllib3==2.2.3 \
     # via
     #   requests
     #   twine
-virtualenv==20.27.1 \
-    --hash=sha256:142c6be10212543b32c6c45d3d3893dff89112cc588b7d0879ae5a1ec03a47ba \
-    --hash=sha256:f11f1b8a29525562925f745563bfd48b189450f61fb34c4f9cc79dd5aa32a1f4
+virtualenv==20.28.0 \
+    --hash=sha256:23eae1b4516ecd610481eda647f3a7c09aea295055337331bb4e6892ecce47b0 \
+    --hash=sha256:2c9c3262bb8e7b87ea801d715fae4495e6032450c71d2309be9550e7364049aa
     # via nox
 webencodings==0.5.1 \
     --hash=sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78 \