diff --git a/lib/build.gradle b/lib/build.gradle
index 0b42c7bcc1..1a112c78cc 100644
--- a/lib/build.gradle
+++ b/lib/build.gradle
@@ -119,6 +119,23 @@ dependencies {
 spotbugs { reportLevel = 'low' } // low|medium|high (low = sensitive to even minor mistakes)
 
 apply from: rootProject.file('gradle/special-tests.gradle')
+tasks.withType(Test).configureEach {
+	def jdkVersion = JavaVersion.current().majorVersion.toInteger()
+	def args = []
+	if (jdkVersion >= 16) {
+		// https://docs.gradle.org/7.5/userguide/upgrading_version_7.html#removes_implicit_add_opens_for_test_workers
+		args += [
+			"--add-opens=java.base/java.lang=ALL-UNNAMED",
+			"--add-opens=java.base/java.util=ALL-UNNAMED",
+		]
+	}
+	if (jdkVersion >= 18) {
+		// https://openjdk.org/jeps/411
+		args += "-Djava.security.manager=allow"
+	}
+	jvmArgs(args)
+}
+
 jar {
 	for (glue in NEEDS_GLUE) {
 		from sourceSets.getByName(glue).output.classesDirs
diff --git a/lib/src/testCompatKtLint0Dot48Dot0/java/com/diffplug/spotless/glue/ktlint/compat/KtLintCompat0Dot48Dot0AdapterTest.java b/lib/src/testCompatKtLint0Dot48Dot0/java/com/diffplug/spotless/glue/ktlint/compat/KtLintCompat0Dot48Dot0AdapterTest.java
index 6825b3d818..8804f86b08 100644
--- a/lib/src/testCompatKtLint0Dot48Dot0/java/com/diffplug/spotless/glue/ktlint/compat/KtLintCompat0Dot48Dot0AdapterTest.java
+++ b/lib/src/testCompatKtLint0Dot48Dot0/java/com/diffplug/spotless/glue/ktlint/compat/KtLintCompat0Dot48Dot0AdapterTest.java
@@ -22,6 +22,7 @@
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -33,12 +34,13 @@ public class KtLintCompat0Dot48Dot0AdapterTest {
 	public void testDefaults(@TempDir Path path) throws IOException {
 		KtLintCompat0Dot48Dot0Adapter ktLintCompat0Dot48Dot0Adapter = new KtLintCompat0Dot48Dot0Adapter();
 		String text = loadAndWriteText(path, "empty_class_body.kt");
+		final Path filePath = Paths.get(path.toString(), "empty_class_body.kt");
 
 		Map<String, String> userData = new HashMap<>();
 
 		Map<String, Object> editorConfigOverrideMap = new HashMap<>();
 
-		String formatted = ktLintCompat0Dot48Dot0Adapter.format(text, path, false, false, null, userData, editorConfigOverrideMap);
+		String formatted = ktLintCompat0Dot48Dot0Adapter.format(text, filePath, false, false, null, userData, editorConfigOverrideMap);
 		assertEquals("class empty_class_body\n", formatted);
 	}
 
@@ -46,6 +48,7 @@ public void testDefaults(@TempDir Path path) throws IOException {
 	public void testEditorConfigCanDisable(@TempDir Path path) throws IOException {
 		KtLintCompat0Dot48Dot0Adapter ktLintCompat0Dot48Dot0Adapter = new KtLintCompat0Dot48Dot0Adapter();
 		String text = loadAndWriteText(path, "fails_no_semicolons.kt");
+		final Path filePath = Paths.get(path.toString(), "fails_no_semicolons.kt");
 
 		Map<String, String> userData = new HashMap<>();
 
@@ -53,7 +56,7 @@ public void testEditorConfigCanDisable(@TempDir Path path) throws IOException {
 		editorConfigOverrideMap.put("indent_style", "tab");
 		editorConfigOverrideMap.put("ktlint_standard_no-semi", "disabled");
 
-		String formatted = ktLintCompat0Dot48Dot0Adapter.format(text, path, false, false, null, userData, editorConfigOverrideMap);
+		String formatted = ktLintCompat0Dot48Dot0Adapter.format(text, filePath, false, false, null, userData, editorConfigOverrideMap);
 		assertEquals("class fails_no_semicolons {\n\tval i = 0;\n}\n", formatted);
 	}