diff --git a/README.md b/README.md
index 369f098..53a0da6 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ You will need to make the following adjustments to your build:
 ### project/build.properties
 
 ```
-sbt.version=1.9.8
+sbt.version=1.9.9
 ```
 
 You must use sbt 1.5.5 or newer; older versions of sbt are not supported.
diff --git a/project/build.properties b/project/build.properties
index abbbce5..04267b1 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.9.8
+sbt.version=1.9.9