diff --git a/dialogflow-prebuilt-agents/cloud-functions/retail_assistant/requirements.txt b/dialogflow-prebuilt-agents/cloud-functions/retail_assistant/requirements.txt
index 7282d01d..f523d549 100644
--- a/dialogflow-prebuilt-agents/cloud-functions/retail_assistant/requirements.txt
+++ b/dialogflow-prebuilt-agents/cloud-functions/retail_assistant/requirements.txt
@@ -590,18 +590,17 @@ proto-plus==1.25.0 \
     #   google-cloud-firestore
     #   google-cloud-retail
     #   google-events
-protobuf==5.28.3 \
-    --hash=sha256:0c4eec6f987338617072592b97943fdbe30d019c56126493111cf24344c1cc24 \
-    --hash=sha256:135658402f71bbd49500322c0f736145731b16fc79dc8f367ab544a17eab4535 \
-    --hash=sha256:27b246b3723692bf1068d5734ddaf2fccc2cdd6e0c9b47fe099244d80200593b \
-    --hash=sha256:3e6101d095dfd119513cde7259aa703d16c6bbdfae2554dfe5cfdbe94e32d548 \
-    --hash=sha256:3fa2de6b8b29d12c61911505d893afe7320ce7ccba4df913e2971461fa36d584 \
-    --hash=sha256:64badbc49180a5e401f373f9ce7ab1d18b63f7dd4a9cdc43c92b9f0b481cef7b \
-    --hash=sha256:70585a70fc2dd4818c51287ceef5bdba6387f88a578c86d47bb34669b5552c36 \
-    --hash=sha256:712319fbdddb46f21abb66cd33cb9e491a5763b2febd8f228251add221981135 \
-    --hash=sha256:91fba8f445723fcf400fdbe9ca796b19d3b1242cd873907979b9ed71e4afe868 \
-    --hash=sha256:a3f6857551e53ce35e60b403b8a27b0295f7d6eb63d10484f12bc6879c715687 \
-    --hash=sha256:cee1757663fa32a1ee673434fcf3bf24dd54763c79690201208bafec62f19eed
+protobuf==6.33.5 \
+    --hash=sha256:3093804752167bcab3998bec9f1048baae6e29505adaf1afd14a37bddede533c \
+    --hash=sha256:69915a973dd0f60f31a08b8318b73eab2bd6a392c79184b3612226b0a3f8ec02 \
+    --hash=sha256:6ddcac2a081f8b7b9642c09406bc6a4290128fce5f471cddd165960bb9119e5c \
+    --hash=sha256:8afa18e1d6d20af15b417e728e9f60f3aa108ee76f23c3b2c07a2c3b546d3afd \
+    --hash=sha256:8f04fa32763dcdb4973d537d6b54e615cc61108c7cb38fe59310c3192d29510a \
+    --hash=sha256:9b71e0281f36f179d00cbcb119cb19dec4d14a81393e5ea220f64b286173e190 \
+    --hash=sha256:a3157e62729aafb8df6da2c03aa5c0937c7266c626ce11a278b6eb7963c4e37c \
+    --hash=sha256:a5cb85982d95d906df1e2210e58f8e4f1e3cdc088e52c921a041f9c9a0386de5 \
+    --hash=sha256:cbf16ba3350fb7b889fca858fb215967792dc125b35c7976ca4818bee3521cf0 \
+    --hash=sha256:d71b040839446bac0f4d162e758bea99c8251161dae9d0983a3b88dee345153b
     # via
     #   google-api-core
     #   google-cloud-firestore