diff --git a/cdn/requirements.txt b/cdn/requirements.txt
index 85f18765279..05ae861486e 100644
--- a/cdn/requirements.txt
+++ b/cdn/requirements.txt
@@ -1 +1 @@
-six==1.14.0
+six==1.15.0
diff --git a/composer/rest/requirements.txt b/composer/rest/requirements.txt
index a6ca294e204..4ecaa4c004f 100644
--- a/composer/rest/requirements.txt
+++ b/composer/rest/requirements.txt
@@ -1,3 +1,3 @@
 google-auth==1.15.0
 requests==2.23.0
-six==1.14.0
+six==1.15.0
diff --git a/compute/xmpp_wikibot/requirements.txt b/compute/xmpp_wikibot/requirements.txt
index 79e218e0c54..d7db66476b9 100644
--- a/compute/xmpp_wikibot/requirements.txt
+++ b/compute/xmpp_wikibot/requirements.txt
@@ -1,4 +1,4 @@
 Flask==1.1.2
 requests==2.23.0
 sleekxmpp==1.3.3
-six==1.14.0
+six==1.15.0
diff --git a/endpoints/bookstore-grpc-transcoding/requirements.txt b/endpoints/bookstore-grpc-transcoding/requirements.txt
index 945760a0e7a..1f1ae9f8eb8 100644
--- a/endpoints/bookstore-grpc-transcoding/requirements.txt
+++ b/endpoints/bookstore-grpc-transcoding/requirements.txt
@@ -1,5 +1,5 @@
 grpcio==1.29.0
 grpcio-tools==1.29.0
 google-auth==1.15.0
-six==1.14.0
+six==1.15.0
 googleapis-common-protos==1.51.0
diff --git a/endpoints/bookstore-grpc/requirements.txt b/endpoints/bookstore-grpc/requirements.txt
index d2b4db3b0f8..51006788396 100644
--- a/endpoints/bookstore-grpc/requirements.txt
+++ b/endpoints/bookstore-grpc/requirements.txt
@@ -1,4 +1,4 @@
 grpcio==1.29.0
 grpcio-tools==1.29.0
 google-auth==1.15.0
-six==1.14.0
+six==1.15.0
diff --git a/endpoints/getting-started/requirements.txt b/endpoints/getting-started/requirements.txt
index 408f7367fba..960bdf7dc9d 100644
--- a/endpoints/getting-started/requirements.txt
+++ b/endpoints/getting-started/requirements.txt
@@ -1,7 +1,7 @@
 Flask==1.1.2
 flask-cors==3.0.8
 gunicorn==20.0.4
-six==1.14.0
+six==1.15.0
 pyyaml==5.3.1
 requests==2.23.0
 google-auth==1.15.0
diff --git a/media-translation/cloud-client/requirements.txt b/media-translation/cloud-client/requirements.txt
index d189cbf7e9c..33df0201312 100644
--- a/media-translation/cloud-client/requirements.txt
+++ b/media-translation/cloud-client/requirements.txt
@@ -1,3 +1,3 @@
 google-cloud-media-translation==0.1.1
 pyaudio==0.2.11
-six==1.14.0
\ No newline at end of file
+six==1.15.0
\ No newline at end of file
diff --git a/speech/microphone/requirements.txt b/speech/microphone/requirements.txt
index 3a75f3402b8..40560b79662 100644
--- a/speech/microphone/requirements.txt
+++ b/speech/microphone/requirements.txt
@@ -1,4 +1,4 @@
 google-cloud-speech==1.3.2
 pyaudio==0.2.11
-six==1.14.0
+six==1.15.0
 
diff --git a/storage/signed_urls/requirements.txt b/storage/signed_urls/requirements.txt
index 1bd27ad97b8..1ab05e236e2 100644
--- a/storage/signed_urls/requirements.txt
+++ b/storage/signed_urls/requirements.txt
@@ -1,3 +1,3 @@
 google-cloud-storage==1.28.1
 google-auth==1.15.0
-six==1.14.0
+six==1.15.0