diff --git a/README.md b/README.md
index 1c1a0d29..24ec47f5 100644
--- a/README.md
+++ b/README.md
@@ -14,10 +14,10 @@ $ heroku create --buildpack vapor/vapor
 
 $ git push heroku master
 remote: -----> Swift app detected
-remote: -----> Using Swift 5.8.1 (default)
-remote: -----> Using built-in clang (Swift 5.8.1)
+remote: -----> Using Swift 5.9 (default)
+remote: -----> Using built-in clang (Swift 5.9)
 remote: -----> Installing swiftenv
-remote: -----> Installing Swift 5.8.1
+remote: -----> Installing Swift 5.9
 ...
 ```
 
@@ -50,22 +50,22 @@ web: Run --env=production --port=$PORT
 
 ### Specify a Swift version
 
-The buildpack defaults to Swift 5.8.1 and will be updated when new Swift versions are released.
+The buildpack defaults to Swift 5.9 and will be updated when new Swift versions are released.
 
 If you need to use a specific version of the Swift toolchain, including older versions – for example Swift 4.2.x to retain compatibility with Swift 3 projects, or a previous version as you run into issues with the latest – you can pin any version number using a file called `.swift-version` in the root of the project folder, or by setting a `SWIFT_VERSION` configuration variable on Heroku, then deploying again. 
 
 ```shell
-$ echo '5.7.3' > .swift-version
+$ echo '5.8.1' > .swift-version
 $ git add .swift-version
-$ git commit -m "Pin Swift version to 5.7.3"
+$ git commit -m "Pin Swift version to 5.8.1"
 $ git push heroku main
 ```
 
 Or:
 
 ```shell
-$ heroku config:set SWIFT_VERSION=5.7.3
-$ git commit -m "Pin Swift version to 5.7.3" --allow-empty
+$ heroku config:set SWIFT_VERSION=5.8.1
+$ git commit -m "Pin Swift version to 5.8.1" --allow-empty
 $ git push heroku main
 ```
 
diff --git a/bin/compile b/bin/compile
index bcf534f9..98d023a9 100755
--- a/bin/compile
+++ b/bin/compile
@@ -13,7 +13,7 @@ ENV_DIR=$3
 
 CLANG_VERSION=7.0.1
 
-SWIFT_VERSION="5.8.1"
+SWIFT_VERSION="5.9"
 SWIFT_BUILD_CONFIGURATION="release"
 SWIFT_BUILD_FLAGS=""
 
diff --git a/swiftenv/share/swiftenv-install/5.9 b/swiftenv/share/swiftenv-install/5.9
new file mode 100644
index 00000000..b3701341
--- /dev/null
+++ b/swiftenv/share/swiftenv-install/5.9
@@ -0,0 +1,38 @@
+case "$PLATFORM" in
+  'osx' )
+    URL="https://swift.org/builds/swift-5.9-release/xcode/swift-5.9-RELEASE/swift-5.9-RELEASE-osx.pkg"
+    ;;
+
+  'ubuntu14.04' )
+    echo
+    echo " !     Swift 5.9 does not support Ubuntu 14.04."
+    echo " !     Please upgrade your stack using the 'heroku stack:set' command or via the dashboard."
+    echo " !     If that is not an option, pin an older version of Swift."
+    echo
+    exit 1
+    ;;
+
+  'ubuntu16.04' )
+    echo
+    echo " !     Swift 5.9 does not support Ubuntu 16.04."
+    echo " !     Please upgrade your stack using the 'heroku stack:set' command or via the dashboard."
+    echo " !     If that is not an option, pin an older version of Swift."
+    echo
+    exit 1
+    ;;
+
+  'ubuntu18.04' )
+    URL="https://swift.org/builds/swift-5.9-release/ubuntu1804/swift-5.9-RELEASE/swift-5.9-RELEASE-ubuntu18.04.tar.gz"
+    ;;
+
+  'ubuntu20.04' )
+    URL="https://swift.org/builds/swift-5.9-release/ubuntu2004/swift-5.9-RELEASE/swift-5.9-RELEASE-ubuntu20.04.tar.gz"
+    ;;
+
+  'ubuntu22.04' )
+    URL="https://swift.org/builds/swift-5.9-release/ubuntu2204/swift-5.9-RELEASE/swift-5.9-RELEASE-ubuntu22.04.tar.gz"
+    ;;
+
+  * )
+    ;;
+esac