diff --git a/project/build.properties b/project/build.properties
index 2e26f995..9931f92e 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -14,4 +14,4 @@
 # specific language governing permissions and limitations
 # under the License.
 #
-sbt.version=1.9.8
+sbt.version=1.9.9
diff --git a/scalafix/project/build.properties b/scalafix/project/build.properties
index abbbce5d..04267b14 100644
--- a/scalafix/project/build.properties
+++ b/scalafix/project/build.properties
@@ -1 +1 @@
-sbt.version=1.9.8
+sbt.version=1.9.9