diff --git a/mcap/requirements.txt b/mcap/requirements.txt
index 327c7c0..f2257fa 100644
--- a/mcap/requirements.txt
+++ b/mcap/requirements.txt
@@ -1,3 +1,3 @@
 mcap==1.3.0
 mcap-protobuf-support==0.5.3
-protobuf==6.33.0
\ No newline at end of file
+protobuf==6.33.5
\ No newline at end of file