diff --git a/buildpacks/ruby/src/layers/bundle_install_layer.rs b/buildpacks/ruby/src/layers/bundle_install_layer.rs
index 833c99bf..26451d54 100644
--- a/buildpacks/ruby/src/layers/bundle_install_layer.rs
+++ b/buildpacks/ruby/src/layers/bundle_install_layer.rs
@@ -503,7 +503,7 @@ GEM_PATH=layer_path
         };
         std::fs::write(&gemfile, "iamagemfile").unwrap();
 
-        let target_id = TargetId::from_stack("heroku-24").unwrap();
+        let target_id = TargetId::from_stack("heroku-22").unwrap();
         let metadata = BundleInstallLayerMetadata {
             distro_name: target_id.distro_name,
             distro_version: target_id.distro_version,
@@ -522,7 +522,7 @@ GEM_PATH=layer_path
         let toml_string = format!(
             r#"
 distro_name = "ubuntu"
-distro_version = "24.04"
+distro_version = "22.04"
 cpu_architecture = "amd64"
 ruby_version = "3.1.3"
 force_bundle_install_key = "v1"
diff --git a/buildpacks/ruby/src/target_id.rs b/buildpacks/ruby/src/target_id.rs
index b58759ee..cad39764 100644
--- a/buildpacks/ruby/src/target_id.rs
+++ b/buildpacks/ruby/src/target_id.rs
@@ -9,8 +9,8 @@ pub(crate) struct TargetId {
 }
 
 const DISTRO_VERSION_STACK: &[(&str, &str, &str)] = &[
+    ("ubuntu", "20.04", "heroku-20"),
     ("ubuntu", "22.04", "heroku-22"),
-    ("ubuntu", "24.04", "heroku-24"),
 ];
 
 #[derive(Debug, thiserror::Error)]
@@ -56,22 +56,22 @@ mod test {
     #[test]
     fn test_stack_name() {
         assert_eq!(
-            String::from("heroku-22"),
+            String::from("heroku-20"),
             TargetId {
                 cpu_architecture: String::from("amd64"),
                 distro_name: String::from("ubuntu"),
-                distro_version: String::from("22.04"),
+                distro_version: String::from("20.04"),
             }
             .stack_name()
             .unwrap()
         );
 
         assert_eq!(
-            String::from("heroku-24"),
+            String::from("heroku-22"),
             TargetId {
                 cpu_architecture: String::from("amd64"),
                 distro_name: String::from("ubuntu"),
-                distro_version: String::from("24.04"),
+                distro_version: String::from("22.04"),
             }
             .stack_name()
             .unwrap()
@@ -81,20 +81,20 @@ mod test {
     #[test]
     fn test_from_stack() {
         assert_eq!(
-            TargetId::from_stack("heroku-22").unwrap(),
+            TargetId::from_stack("heroku-20").unwrap(),
             TargetId {
                 cpu_architecture: String::from("amd64"),
                 distro_name: String::from("ubuntu"),
-                distro_version: String::from("22.04"),
+                distro_version: String::from("20.04"),
             }
         );
 
         assert_eq!(
-            TargetId::from_stack("heroku-24").unwrap(),
+            TargetId::from_stack("heroku-22").unwrap(),
             TargetId {
                 cpu_architecture: String::from("amd64"),
                 distro_name: String::from("ubuntu"),
-                distro_version: String::from("24.04"),
+                distro_version: String::from("22.04"),
             }
         );
     }
diff --git a/buildpacks/ruby/tests/integration_test.rs b/buildpacks/ruby/tests/integration_test.rs
index 0bfab912..5681639a 100644
--- a/buildpacks/ruby/tests/integration_test.rs
+++ b/buildpacks/ruby/tests/integration_test.rs
@@ -40,7 +40,24 @@ fn test_migrating_metadata() {
 
 #[test]
 #[ignore = "integration test"]
-fn test_default_app() {
+fn test_default_app_ubuntu20() {
+    TestRunner::default().build(
+        BuildConfig::new("heroku/builder:20", "tests/fixtures/default_ruby"),
+        |context| {
+            assert_contains!(context.pack_stdout, "# Heroku Ruby Buildpack");
+            assert_contains!(
+                context.pack_stdout,
+                r#"`BUNDLE_BIN="/layers/heroku_ruby/gems/bin" BUNDLE_CLEAN="1" BUNDLE_DEPLOYMENT="1" BUNDLE_GEMFILE="/workspace/Gemfile" BUNDLE_PATH="/layers/heroku_ruby/gems" BUNDLE_WITHOUT="development:test" bundle install`"#);
+
+            println!("{}", context.pack_stdout); // Needed to get full failure as `rebuild` truncates stdout
+            assert_contains!(context.pack_stdout, "Installing webrick");
+        },
+    );
+}
+
+#[test]
+#[ignore = "integration test"]
+fn test_default_app_latest_distro() {
     TestRunner::default().build(
         BuildConfig::new("heroku/builder:22", "tests/fixtures/default_ruby"),
         |context| {