diff --git a/CHANGES b/CHANGES
index 13b3c415f1..5e93cf5973 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+8.1.0-dev.91 | 2025-08-18 14:59:41 -0700
+
+  * Add a missing header for the broker cluster serializer (Tim Wojtulewicz, Corelight)
+
 8.1.0-dev.89 | 2025-08-18 14:46:57 -0700
 
   * Bump auxil/spicy to latest development snapshot (Benjamin Bannier, Corelight)
diff --git a/VERSION b/VERSION
index e5640874c1..5257691cc1 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-8.1.0-dev.89
+8.1.0-dev.91
diff --git a/src/cluster/serializer/broker/Serializer.cc b/src/cluster/serializer/broker/Serializer.cc
index 7495e8eadc..8c0a72e122 100644
--- a/src/cluster/serializer/broker/Serializer.cc
+++ b/src/cluster/serializer/broker/Serializer.cc
@@ -2,6 +2,7 @@
 
 #include "zeek/cluster/serializer/broker/Serializer.h"
 
+#include <cinttypes>
 #include <optional>
 
 #include "zeek/DebugLogger.h"