diff --git a/examples/openfunction_dapr_trigger/caller/requirements.txt b/examples/openfunction_dapr_trigger/caller/requirements.txt
index f352a68..b89b767 100644
--- a/examples/openfunction_dapr_trigger/caller/requirements.txt
+++ b/examples/openfunction_dapr_trigger/caller/requirements.txt
@@ -1,2 +1,3 @@
 dapr-ext-grpc == 1.10.0
 dapr == 1.10.0
+protobuf>=4.25.8 # not directly required, pinned by Snyk to avoid a vulnerability