diff --git a/README.md b/README.md
index dfa6c3e..084e749 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ sbt -v[erbosely] creating a new project built with the latest scala 2.12.x.
 [addSbt] arg = '++ 2.12.18'
 [residual] arg = 'about'
 No extra sbt options have been defined
-Detected sbt version 1.9.8
+Detected sbt version 1.9.9
 Using default jvm options
 Detected Java version: 8
 # Executing command line:
@@ -42,7 +42,7 @@ java
 -Xms512m
 -Xss2m
 -jar
-$HOME/.sbt/launchers/1.9.8/sbt-launch.jar
+$HOME/.sbt/launchers/1.9.9/sbt-launch.jar
 "++ 2.12.18"
 about
 
@@ -55,7 +55,7 @@ saving stty: [..]
 [info] Setting Scala version to 2.12.18 on 1 projects.
 [info] Reapplying settings...
 [info] Set current project to [..] (in build file:[..])
-[info] This is sbt 1.9.8
+[info] This is sbt 1.9.9
 [info] The current project is ProjectRef(uri("file:[..]"), "[..]") [..]
 [info] The current project is built against Scala 2.12.18
 [info] Available Plugins
@@ -92,10 +92,10 @@ are not special.
   -prompt <expr>     Set the sbt prompt; in expr, 's' is the State and 'e' is Extracted
   -script <file>     Run the specified file as a scala script
 
-  # sbt version (default: sbt.version from project/build.properties if present, otherwise 1.9.8)
-  -sbt-version <version>  use the specified version of sbt (default: 1.9.8)
-  -sbt-force-latest       force the use of the latest release of sbt: 1.9.8
-  -sbt-dev                use the latest pre-release version of sbt: 1.9.8
+  # sbt version (default: sbt.version from project/build.properties if present, otherwise 1.9.9)
+  -sbt-version <version>  use the specified version of sbt (default: 1.9.9)
+  -sbt-force-latest       force the use of the latest release of sbt: 1.9.9
+  -sbt-dev                use the latest pre-release version of sbt: 1.9.9
   -sbt-jar      <path>    use the specified jar as the sbt launcher
   -sbt-launch-dir <path>  directory to hold sbt launchers (default: ~/.sbt/launchers)
   -sbt-launch-repo <url>  repo url for downloading sbt launcher jar (default: https://repo.scala-sbt.org/scalasbt/maven-releases)
diff --git a/sbt b/sbt
index fbd15a7..0b0e1ab 100755
--- a/sbt
+++ b/sbt
@@ -34,8 +34,8 @@
 
 set -o pipefail
 
-declare -r sbt_release_version="1.9.8"
-declare -r sbt_unreleased_version="1.9.8"
+declare -r sbt_release_version="1.9.9"
+declare -r sbt_unreleased_version="1.9.9"
 
 declare -r latest_213="2.13.12"
 declare -r latest_212="2.12.18"
diff --git a/test/test_helper.bash b/test/test_helper.bash
index d4be0ad..c55b9a9 100644
--- a/test/test_helper.bash
+++ b/test/test_helper.bash
@@ -12,9 +12,9 @@ export sbt_10="0.10.1"
 export sbt_11="0.11.3"
 export sbt_12="0.12.4"
 export sbt_13="0.13.18"
-export sbt_1="1.9.8"
+export sbt_1="1.9.9"
 export sbt_release="$sbt_1"
-export sbt_dev="1.9.8"
+export sbt_dev="1.9.9"
 
 write_version_to_properties () { write_to_properties "sbt.version=$1";  }
 write_to_properties ()         { printf "$@" > "$test_build_properties"; }