diff --git a/examples/scalapb-crossproject/project/build.properties b/examples/scalapb-crossproject/project/build.properties
index abbbce5d..04267b14 100644
--- a/examples/scalapb-crossproject/project/build.properties
+++ b/examples/scalapb-crossproject/project/build.properties
@@ -1 +1 @@
-sbt.version=1.9.8
+sbt.version=1.9.9
diff --git a/project/build.properties b/project/build.properties
index abbbce5d..04267b14 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.9.8
+sbt.version=1.9.9