diff --git a/jvm/CHANGELOG.md b/jvm/CHANGELOG.md
index b5c16b68..52dfa48a 100644
--- a/jvm/CHANGELOG.md
+++ b/jvm/CHANGELOG.md
@@ -11,6 +11,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Restore support for JRE 11. (fixes [#528](https://github.com/diffplug/selfie/issues/528))
 
 ## [2.5.2] - 2025-04-28
 ### Fixed
diff --git a/jvm/gradle.properties b/jvm/gradle.properties
index df6730c0..641babd3 100644
--- a/jvm/gradle.properties
+++ b/jvm/gradle.properties
@@ -10,4 +10,6 @@ ver_OKIO=3.9.0
 ver_KOTLIN_TEST=2.0.0
 ver_KOTLIN_SERIALIZATION=1.7.3
 # Kotest 5.4.0 is the oldest that we support
-ver_KOTEST=5.4.0
\ No newline at end of file
+ver_KOTEST=5.4.0
+
+ver_JVM_TARGET=11
\ No newline at end of file
diff --git a/jvm/gradle/jvm-target.gradle b/jvm/gradle/jvm-target.gradle
new file mode 100644
index 00000000..970c60cb
--- /dev/null
+++ b/jvm/gradle/jvm-target.gradle
@@ -0,0 +1,29 @@
+if (plugins.hasPlugin('org.jetbrains.kotlin.jvm')) {
+    kotlin {
+        compileKotlin {
+            kotlinOptions {
+                jvmTarget = "$ver_JVM_TARGET"
+            }
+        }
+    }
+    tasks.named('compileJava', JavaCompile) {
+        options.release = Integer.parseInt(ver_JVM_TARGET)
+    }
+} else if (plugins.hasPlugin('org.jetbrains.kotlin.multiplatform')) {
+    kotlin {
+        jvm {
+            compilations.all {
+                kotlinOptions {
+                    jvmTarget = "$ver_JVM_TARGET"
+                }
+            }
+        }
+        targets.withType(org.jetbrains.kotlin.gradle.targets.jvm.KotlinJvmTarget) {
+            compilations.all {
+                kotlinOptions {
+                    jvmTarget = "$ver_JVM_TARGET"
+                }
+            }
+        }
+    }
+}
diff --git a/jvm/selfie-lib/build.gradle b/jvm/selfie-lib/build.gradle
index 90cf72b2..8bbf7005 100644
--- a/jvm/selfie-lib/build.gradle
+++ b/jvm/selfie-lib/build.gradle
@@ -58,4 +58,5 @@ tasks.create('test') {
 
 // it all needs to get published and formatted
 apply from: 干.file('base/maven.gradle')
-apply from: 干.file('base/sonatype.gradle')
\ No newline at end of file
+apply from: 干.file('base/sonatype.gradle')
+apply from: rootProject.file('gradle/jvm-target.gradle')
diff --git a/jvm/selfie-runner-junit5/build.gradle b/jvm/selfie-runner-junit5/build.gradle
index 165cf3ca..87371943 100644
--- a/jvm/selfie-runner-junit5/build.gradle
+++ b/jvm/selfie-runner-junit5/build.gradle
@@ -35,3 +35,4 @@ test {
 // it all needs to get published and formatted
 apply from: 干.file('base/maven.gradle')
 apply from: 干.file('base/sonatype.gradle')
+apply from: rootProject.file('gradle/jvm-target.gradle')
diff --git a/jvm/selfie-runner-kotest/build.gradle b/jvm/selfie-runner-kotest/build.gradle
index 01da20dd..3dcf4f2d 100644
--- a/jvm/selfie-runner-kotest/build.gradle
+++ b/jvm/selfie-runner-kotest/build.gradle
@@ -59,3 +59,4 @@ jvmTest {
 // it all needs to get published and formatted
 apply from: 干.file('base/maven.gradle')
 apply from: 干.file('base/sonatype.gradle')
+apply from: rootProject.file('gradle/jvm-target.gradle')
diff --git a/jvm/undertest-junit5-kotest/harness/gradle/jvm-target.gradle b/jvm/undertest-junit5-kotest/harness/gradle/jvm-target.gradle
new file mode 100644
index 00000000..e69de29b