diff --git a/README.md b/README.md
index 208ff67..496aee9 100644
--- a/README.md
+++ b/README.md
@@ -7,18 +7,17 @@ This plugin configures `JavaCompile` tasks to use [Error Prone].
 ## Requirements
 
 > [!IMPORTANT]
-> This plugin requires using at least Gradle 6.8 and JDK 9 (for compilation; it's OK to use JDK 8 to run Gradle as long as compilations use at least JDK 9 through [Gradle Java Toolchains][gradle-toolchains]).
+> This plugin requires using at least Gradle 6.8 and JDK 11 (for compilation; it's OK to use JDK 8 to run Gradle as long as compilations use at least JDK 11 through [Gradle Java Toolchains][gradle-toolchains]).
 
 The exact minimum required version of the JDK depends on the version of Error Prone being used (independently of the version of this plugin);
 there's no forward compatibility guarantee though so older versions of Error Prone aren't necessarily compatible with newer versions of the JDK.
 
 | Error Prone version  | Minimum JDK version |
 | :------------------: | :-----------------: |
-| Up to 2.10           | 9                   |
-| From 2.10 up to 2.31 | 11                  |
+| Up to 2.31           | 11                  |
 | Starting from 2.32   | 17                  |
 
-You can still compile down to Java 8 bytecode though, by using JDK 9+ support for `--release 8` (which you can configure with Gradle using [`options.release`][CompileOptions.release]), or with `-source` / `-target` / `-bootclasspath` (configured with Gradle using [`sourceCompatibility`][JavaCompile.sourceCompatibility] / [`targetCompatibility`][JavaCompile.targetCompatibility] / [`options.bootstrapClasspath`][CompileOptions.bootstrapClasspath]).
+You can still compile down to a Java version bytecode though, by using javac's support for `--release` (which you can configure with Gradle using [`options.release`][CompileOptions.release]), or with `-source` / `-target` / `-bootclasspath` (configured with Gradle using [`sourceCompatibility`][JavaCompile.sourceCompatibility] / [`targetCompatibility`][JavaCompile.targetCompatibility] / [`options.bootstrapClasspath`][CompileOptions.bootstrapClasspath]).
 
 ```kotlin
 tasks.withType<JavaCompile>().configureEach {
diff --git a/src/main/kotlin/net/ltgt/gradle/errorprone/ErrorPronePlugin.kt b/src/main/kotlin/net/ltgt/gradle/errorprone/ErrorPronePlugin.kt
index 8ad70d5..0e3b463 100644
--- a/src/main/kotlin/net/ltgt/gradle/errorprone/ErrorPronePlugin.kt
+++ b/src/main/kotlin/net/ltgt/gradle/errorprone/ErrorPronePlugin.kt
@@ -31,7 +31,7 @@ class ErrorPronePlugin @Inject constructor(
 
         const val CONFIGURATION_NAME = "errorprone"
 
-        internal const val TOO_OLD_TOOLCHAIN_ERROR_MESSAGE = "Must not enable ErrorProne when compiling with JDK < 9"
+        internal const val TOO_OLD_TOOLCHAIN_ERROR_MESSAGE = "Must not enable ErrorProne when compiling with JDK < 11"
 
         private val HAS_JVM_ARGUMENT_PROVIDERS = GradleVersion.current() >= GradleVersion.version("7.1")
 
@@ -112,7 +112,7 @@ class ErrorPronePlugin @Inject constructor(
             doFirst("Configure forking for errorprone") {
                 if (!errorproneOptions.isEnabled.getOrElse(false)) return@doFirst
                 jvmArgumentProvider.compilerVersion?.let {
-                    if (it < JavaVersion.VERSION_1_9) throw UnsupportedOperationException(TOO_OLD_TOOLCHAIN_ERROR_MESSAGE)
+                    if (it < JavaVersion.VERSION_11) throw UnsupportedOperationException(TOO_OLD_TOOLCHAIN_ERROR_MESSAGE)
                     if ((it == JavaVersion.current() && CURRENT_JVM_NEEDS_FORKING) && !options.isFork) options.isFork = true
                 }
             }
@@ -123,7 +123,7 @@ class ErrorPronePlugin @Inject constructor(
                 project.configurations[annotationProcessorConfigurationName].extendsFrom(errorproneConfiguration)
                 project.tasks.named<JavaCompile>(compileJavaTaskName) {
                     options.errorprone {
-                        isEnabled.convention(javaCompiler.map { it.metadata.languageVersion.asInt() >= 9 }.orElse(true))
+                        isEnabled.convention(javaCompiler.map { it.metadata.languageVersion.asInt() >= 11 }.orElse(true))
                         isCompilingTestOnlyCode.convention(this@configureEach.name.matches(TEST_SOURCE_SET_NAME_REGEX))
                     }
                 }
@@ -150,7 +150,7 @@ internal class ErrorProneJvmArgumentProvider(
     override fun asArguments(): Iterable<String> = when {
         !errorproneOptions.isEnabled.getOrElse(false) -> emptyList()
         compilerVersion == null -> emptyList()
-        compilerVersion!! >= JavaVersion.VERSION_1_9 -> ErrorPronePlugin.JVM_ARGS_STRONG_ENCAPSULATION
+        compilerVersion!! >= JavaVersion.VERSION_11 -> ErrorPronePlugin.JVM_ARGS_STRONG_ENCAPSULATION
         else -> emptyList()
     }
 }
@@ -170,7 +170,7 @@ internal class ErrorProneCompilerArgumentProvider(
 
     override fun asArguments(): Iterable<String> {
         return when {
-            errorproneOptions.isEnabled.getOrElse(false) -> listOf("-Xplugin:ErrorProne $errorproneOptions", "-XDcompilePolicy=simple", "-XDshould-stop.ifError=FLOW")
+            errorproneOptions.isEnabled.getOrElse(false) -> listOf("-Xplugin:ErrorProne $errorproneOptions", "-XDcompilePolicy=simple", "--should-stop=ifError=FLOW")
             else -> emptyList()
         }
     }