diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 305052e4..458c9278 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -13,10 +13,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v1
-      - name: Set up JDK 1.8
+      - name: Set up JDK 16
         uses: actions/setup-java@v1
         with:
-          java-version: 1.8
+          java-version: 16
       - name: Upload to Maven
         run: ./gradlew publish --stacktrace
         env:
diff --git a/build.gradle b/build.gradle
index 3afd6836..5920eafb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -17,6 +17,15 @@ plugins {
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
+tasks.withType(JavaCompile).configureEach {
+	it.options.encoding = "UTF-8"
+
+	if (JavaVersion.current().isJava9Compatible()) {
+		it.options.release = 8
+	}
+}
+
+
 group = "dev.architectury"
 archivesBaseName = project.name
 def baseVersion = '0.7.1'
@@ -54,9 +63,6 @@ repositories {
 dependencies {
 	implementation gradleApi()
 
-	// Compile against groovy 3 to aid with gradle 7 support. Remove when updating to gradle 7
-	compileOnly 'org.codehaus.groovy:groovy:3.0.7'
-
 	// libraries
 	implementation ('commons-io:commons-io:2.8.0')
 	implementation ('org.zeroturnaround:zt-zip:1.14')
@@ -95,7 +101,7 @@ dependencies {
 	implementation ('org.cadixdev:mercury:0.2.9-architectury')
 
 	// Kapt integration
-	compileOnly('org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.21')
+	compileOnly('org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.32')
 
 	// Forge patches
 	implementation ('net.minecraftforge:binarypatcher:1.1.1')
@@ -115,7 +121,7 @@ dependencies {
 
 	// Testing
 	testImplementation(gradleTestKit())
-	testImplementation('org.spockframework:spock-core:1.3-groovy-2.4') {
+	testImplementation('org.spockframework:spock-core:2.0-M5-groovy-3.0') {
 		exclude module: 'groovy-all'
 	}
 	testImplementation 'io.javalin:javalin:3.13.4'
@@ -149,12 +155,12 @@ task mainJar(type: Jar, dependsOn: jar) {
 }
 
 task sourcesJar(type: Jar, dependsOn: classes) {
-	classifier = 'sources'
+	archiveClassifier = 'sources'
 	from sourceSets.main.allSource
 }
 
 task javadocJar(type: Jar, dependsOn: javadoc) {
-	classifier = 'javadoc'
+	archiveClassifier = 'javadoc'
 	from javadoc.destinationDir
 }
 
@@ -170,7 +176,7 @@ license {
 
 checkstyle {
 	configFile = file('checkstyle.xml')
-	toolVersion = '8.39'
+	toolVersion = '8.41.1'
 }
 
 codenarc {
@@ -205,6 +211,7 @@ jacocoTestReport {
 
 test {
 	maxHeapSize = "4096m"
+	useJUnitPlatform()
 }
 
 import org.w3c.dom.Document
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 87b738cb..0d4a9516 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 071bbc55..76d741b8 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,5 @@
-#Mon Jun 24 11:09:08 BST 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0-rc-2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-all.zip
diff --git a/gradlew b/gradlew
index af6708ff..cccdd3d5 100755
--- a/gradlew
+++ b/gradlew
@@ -28,7 +28,7 @@ APP_NAME="Gradle"
 APP_BASE_NAME=`basename "$0"`
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m"'
+DEFAULT_JVM_OPTS=""
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
diff --git a/gradlew.bat b/gradlew.bat
index 6d57edc7..f9553162 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -14,7 +14,7 @@ set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS="-Xmx64m"
+set DEFAULT_JVM_OPTS=
 
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome
diff --git a/src/main/java/net/fabricmc/loom/configuration/RemappedConfigurationEntry.java b/src/main/java/net/fabricmc/loom/configuration/RemappedConfigurationEntry.java
index a796b62c..01b0d94c 100644
--- a/src/main/java/net/fabricmc/loom/configuration/RemappedConfigurationEntry.java
+++ b/src/main/java/net/fabricmc/loom/configuration/RemappedConfigurationEntry.java
@@ -27,9 +27,6 @@ package net.fabricmc.loom.configuration;
 import org.gradle.api.artifacts.ConfigurationContainer;
 import org.gradle.api.plugins.JavaPlugin;
 
-import net.fabricmc.loom.util.Constants;
-import net.fabricmc.loom.util.gradle.GradleSupport;
-
 public class RemappedConfigurationEntry {
 	private final String sourceConfiguration;
 	private final String targetConfiguration;
@@ -65,7 +62,7 @@ public class RemappedConfigurationEntry {
 
 	public String getTargetConfiguration(ConfigurationContainer container) {
 		if (container.findByName(targetConfiguration) == null) {
-			return GradleSupport.IS_GRADLE_7_OR_NEWER ? JavaPlugin.IMPLEMENTATION_CONFIGURATION_NAME : Constants.Configurations.COMPILE;
+			return JavaPlugin.IMPLEMENTATION_CONFIGURATION_NAME;
 		}
 
 		return targetConfiguration;
diff --git a/src/main/java/net/fabricmc/loom/task/RemapJarTask.java b/src/main/java/net/fabricmc/loom/task/RemapJarTask.java
index 723c6ec4..c1e5d2a0 100644
--- a/src/main/java/net/fabricmc/loom/task/RemapJarTask.java
+++ b/src/main/java/net/fabricmc/loom/task/RemapJarTask.java
@@ -107,7 +107,7 @@ public class RemapJarTask extends Jar {
 
 	public RemapJarTask() {
 		super();
-		input = GradleSupport.getfileProperty(getProject());
+		input = getProject().getObjects().fileProperty();
 		addNestedDependencies = getProject().getObjects().property(Boolean.class);
 		addDefaultNestedDependencies = getProject().getObjects().property(Boolean.class);
 		remapAccessWidener = getProject().getObjects().property(Boolean.class);
diff --git a/src/main/java/net/fabricmc/loom/util/Constants.java b/src/main/java/net/fabricmc/loom/util/Constants.java
index a9404c44..80dc3464 100644
--- a/src/main/java/net/fabricmc/loom/util/Constants.java
+++ b/src/main/java/net/fabricmc/loom/util/Constants.java
@@ -31,7 +31,6 @@ import org.gradle.api.plugins.JavaPlugin;
 import org.objectweb.asm.Opcodes;
 
 import net.fabricmc.loom.configuration.RemappedConfigurationEntry;
-import net.fabricmc.loom.util.gradle.GradleSupport;
 
 public class Constants {
 	public static final String PLUGIN_ID = "dev.architectury.loom";
@@ -44,23 +43,13 @@ public class Constants {
 
 	public static final int ASM_VERSION = Opcodes.ASM9;
 
-	private static final List<RemappedConfigurationEntry> LEGACY_MOD_COMPILE_ENTRIES = ImmutableList.of(
-			new RemappedConfigurationEntry("modCompile", Configurations.COMPILE, true, "compile"),
+	public static final List<RemappedConfigurationEntry> MOD_COMPILE_ENTRIES = ImmutableList.of(
 			new RemappedConfigurationEntry("modApi", JavaPlugin.API_CONFIGURATION_NAME, true, "compile"),
 			new RemappedConfigurationEntry("modImplementation", JavaPlugin.IMPLEMENTATION_CONFIGURATION_NAME, true, "runtime"),
 			new RemappedConfigurationEntry("modRuntime", JavaPlugin.RUNTIME_ONLY_CONFIGURATION_NAME, false, ""),
 			new RemappedConfigurationEntry("modCompileOnly", JavaPlugin.COMPILE_ONLY_CONFIGURATION_NAME, true, "")
 	);
 
-	private static final List<RemappedConfigurationEntry> MODERN_MOD_COMPILE_ENTRIES = ImmutableList.of(
-			new RemappedConfigurationEntry("modApi", JavaPlugin.API_CONFIGURATION_NAME, true, "compile"),
-			new RemappedConfigurationEntry("modImplementation", JavaPlugin.IMPLEMENTATION_CONFIGURATION_NAME, true, "runtime"),
-			new RemappedConfigurationEntry("modRuntime", JavaPlugin.RUNTIME_ONLY_CONFIGURATION_NAME, false, ""),
-			new RemappedConfigurationEntry("modCompileOnly", JavaPlugin.COMPILE_ONLY_CONFIGURATION_NAME, true, "")
-	);
-
-	public static final List<RemappedConfigurationEntry> MOD_COMPILE_ENTRIES = GradleSupport.IS_GRADLE_7_OR_NEWER ? MODERN_MOD_COMPILE_ENTRIES : LEGACY_MOD_COMPILE_ENTRIES;
-
 	private Constants() {
 	}
 
@@ -86,8 +75,6 @@ public class Constants {
 		public static final String FORGE_INSTALLER = "forgeInstaller";
 		public static final String FORGE_UNIVERSAL = "forgeUniversal";
 		public static final String FORGE_DEPENDENCIES = "forgeDependencies";
-		@Deprecated // Not to be used in gradle 7+
-		public static final String COMPILE = "compile";
 		public static final String MAPPING_CONSTANTS = "mappingsConstants";
 		public static final String UNPICK_CLASSPATH = "unpick";
 
diff --git a/src/main/java/net/fabricmc/loom/util/GroovyXmlUtil.java b/src/main/java/net/fabricmc/loom/util/GroovyXmlUtil.java
index 4e587e10..4a31a287 100644
--- a/src/main/java/net/fabricmc/loom/util/GroovyXmlUtil.java
+++ b/src/main/java/net/fabricmc/loom/util/GroovyXmlUtil.java
@@ -31,8 +31,6 @@ import java.util.stream.Stream;
 import groovy.util.Node;
 import groovy.xml.QName;
 
-import net.fabricmc.loom.util.gradle.GradleSupport;
-
 public final class GroovyXmlUtil {
 	private GroovyXmlUtil() { }
 
@@ -66,18 +64,13 @@ public final class GroovyXmlUtil {
 		}
 
 		// New groovy 3 (gradle 7) class
-		if (GradleSupport.IS_GRADLE_7_OR_NEWER && nodeName.getClass().getName().equals("groovy.namespace.QName")) {
-			return isSameNameGroovy3(nodeName, givenName);
+		if (nodeName instanceof groovy.namespace.QName) {
+			return ((groovy.namespace.QName) nodeName).matches(givenName);
 		}
 
 		throw new UnsupportedOperationException("Cannot determine if " + nodeName.getClass() + " is the same as a String");
 	}
 
-	// TODO Move out of its own method when requiring gradle 7
-	private static boolean isSameNameGroovy3(Object nodeName, String givenName) {
-		return ((groovy.namespace.QName) nodeName).matches(givenName);
-	}
-
 	public static Stream<Node> childrenNodesStream(Node node) {
 		//noinspection unchecked
 		return (Stream<Node>) (Stream) (((List<Object>) node.children()).stream().filter((i) -> i instanceof Node));
diff --git a/src/main/java/net/fabricmc/loom/util/gradle/GradleSupport.java b/src/main/java/net/fabricmc/loom/util/gradle/GradleSupport.java
index 068b5438..6c72d5be 100644
--- a/src/main/java/net/fabricmc/loom/util/gradle/GradleSupport.java
+++ b/src/main/java/net/fabricmc/loom/util/gradle/GradleSupport.java
@@ -24,45 +24,12 @@
 
 package net.fabricmc.loom.util.gradle;
 
-import java.lang.reflect.Method;
-
-import org.gradle.api.Project;
-import org.gradle.api.file.RegularFileProperty;
 import org.gradle.util.GradleVersion;
 
 // This is used to bridge the gap over large gradle api changes.
 public class GradleSupport {
 	public static final boolean IS_GRADLE_7_OR_NEWER = isIsGradle7OrNewer();
 
-	public static RegularFileProperty getfileProperty(Project project) {
-		try {
-			// First try the new method, if that fails fall back.
-			return getfilePropertyModern(project);
-		} catch (Exception e) {
-			// Nope
-		}
-
-		try {
-			return getfilePropertyLegacy(project);
-		} catch (Exception e) {
-			throw new RuntimeException("Failed to find file property", e);
-		}
-	}
-
-	private static RegularFileProperty getfilePropertyModern(Project project) throws Exception {
-		return getfilePropertyLegacyFromObject(project.getObjects());
-	}
-
-	private static RegularFileProperty getfilePropertyLegacy(Project project) throws Exception {
-		return getfilePropertyLegacyFromObject(project.getLayout());
-	}
-
-	private static RegularFileProperty getfilePropertyLegacyFromObject(Object object) throws Exception {
-		Method method = object.getClass().getDeclaredMethod("fileProperty");
-		method.setAccessible(true);
-		return (RegularFileProperty) method.invoke(object);
-	}
-
 	public static boolean isIsGradle7OrNewer() {
 		String version = GradleVersion.current().getVersion();
 		return Integer.parseInt(version.substring(0, version.indexOf("."))) >= 7;
diff --git a/src/test/groovy/net/fabricmc/loom/test/integration/DecompileTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/DecompileTest.groovy
index 20dc1629..b812ff23 100644
--- a/src/test/groovy/net/fabricmc/loom/test/integration/DecompileTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/DecompileTest.groovy
@@ -47,7 +47,6 @@ class DecompileTest extends Specification implements ProjectTestTrait {
 		where:
 			decompiler 		| task								| gradle
 			'fernflower'	| "genSources"						| DEFAULT_GRADLE
-			'fernflower'	| "genSources"						| LEGACY_GRADLE
 			'fernflower'	| "genSources"						| PRE_RELEASE_GRADLE
 			'cfr' 			| "genSourcesWithExperimentalCfr"	| DEFAULT_GRADLE
 	}
diff --git a/src/test/groovy/net/fabricmc/loom/test/integration/KotlinTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/KotlinTest.groovy
index ed85674b..3f30adfc 100644
--- a/src/test/groovy/net/fabricmc/loom/test/integration/KotlinTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/KotlinTest.groovy
@@ -25,11 +25,13 @@
 package net.fabricmc.loom.test.integration
 
 import net.fabricmc.loom.test.util.ProjectTestTrait
+import spock.lang.IgnoreIf
 import spock.lang.Specification
 import spock.lang.Unroll
 
 import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
 
+@IgnoreIf({ jvm.java16Compatible }) // Fails on J16 > due to https://youtrack.jetbrains.com/issue/KT-45566
 class KotlinTest extends Specification implements ProjectTestTrait {
 	@Override
 	String name() {
diff --git a/src/test/groovy/net/fabricmc/loom/test/integration/LegacyProjectTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/LegacyProjectTest.groovy
index 73dc8a9e..38188092 100644
--- a/src/test/groovy/net/fabricmc/loom/test/integration/LegacyProjectTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/LegacyProjectTest.groovy
@@ -40,7 +40,7 @@ class LegacyProjectTest extends Specification implements ProjectTestTrait {
 	@Unroll
 	def "build"() {
 		when:
-			def result = create("build", LEGACY_GRADLE)
+			def result = create("build", DEFAULT_GRADLE)
 		then:
 			result.task(":build").outcome == SUCCESS
 	}
diff --git a/src/test/groovy/net/fabricmc/loom/test/integration/ReproducibleBuildTest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/ReproducibleBuildTest.groovy
index 8a983250..1860450c 100644
--- a/src/test/groovy/net/fabricmc/loom/test/integration/ReproducibleBuildTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/ReproducibleBuildTest.groovy
@@ -48,9 +48,9 @@ class ReproducibleBuildTest extends Specification implements ProjectTestTrait {
 			getOutputHash("fabric-example-mod-1.0.0.jar") == modHash
 			getOutputHash("fabric-example-mod-1.0.0-sources.jar") in sourceHash // Done for different line endings.
 		where:
-			gradle      | modHash                               | sourceHash
-			'6.8.3'     | "6132ffb4117adb7e258f663110552952"    | ["be31766e6cafbe4ae3bca9e35ba63169", "7348b0bd87d36d7ec6f3bca9c2b66062"]
-			'7.0-rc-1'  | "6132ffb4117adb7e258f663110552952"    | ["be31766e6cafbe4ae3bca9e35ba63169", "7348b0bd87d36d7ec6f3bca9c2b66062"]
+			gradle              | modHash                               | sourceHash
+			DEFAULT_GRADLE      | "6132ffb4117adb7e258f663110552952"    | ["be31766e6cafbe4ae3bca9e35ba63169", "7348b0bd87d36d7ec6f3bca9c2b66062"]
+			PRE_RELEASE_GRADLE  | "6132ffb4117adb7e258f663110552952"    | ["be31766e6cafbe4ae3bca9e35ba63169", "7348b0bd87d36d7ec6f3bca9c2b66062"]
 	}
 
 	String getOutputHash(String name) {
diff --git a/src/test/groovy/net/fabricmc/loom/test/util/ProjectTestTrait.groovy b/src/test/groovy/net/fabricmc/loom/test/util/ProjectTestTrait.groovy
index 00177865..ca14d073 100644
--- a/src/test/groovy/net/fabricmc/loom/test/util/ProjectTestTrait.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/util/ProjectTestTrait.groovy
@@ -28,8 +28,7 @@ import org.gradle.testkit.runner.BuildResult
 import org.gradle.testkit.runner.GradleRunner
 
 trait ProjectTestTrait {
-	final static String LEGACY_GRADLE = "4.9"
-	final static String DEFAULT_GRADLE = "6.8.3"
+	final static String DEFAULT_GRADLE = "7.0-rc-2"
 	final static String PRE_RELEASE_GRADLE = "7.0"
 
 	static File gradleHome = File.createTempDir()
@@ -95,10 +94,6 @@ trait ProjectTestTrait {
 	}
 
 	String warningMode(String gradleVersion) {
-		if (gradleVersion == LEGACY_GRADLE) {
-			return "all"
-		}
-
 		'fail'
 	}
 
diff --git a/src/test/resources/projects/legacy/build.gradle b/src/test/resources/projects/legacy/build.gradle
index 92e5147d..3b460c49 100644
--- a/src/test/resources/projects/legacy/build.gradle
+++ b/src/test/resources/projects/legacy/build.gradle
@@ -19,23 +19,20 @@ dependencies {
 processResources {
 	inputs.property "version", project.version
 
-	from(sourceSets.main.resources.srcDirs) {
-		include "fabric.mod.json"
+	filesMatching("fabric.mod.json") {
 		expand "version": project.version
 	}
-
-	from(sourceSets.main.resources.srcDirs) {
-		exclude "fabric.mod.json"
-	}
 }
 
 tasks.withType(JavaCompile) {
 	options.encoding = "UTF-8"
 }
 
-task sourcesJar(type: Jar, dependsOn: classes) {
-	classifier = "sources"
-	from sourceSets.main.allSource
+java {
+	// Loom will automatically attach sourcesJar to a RemapSourcesJar task and to the "build" task
+	// if it is present.
+	// If you remove this line, sources will not be generated.
+	withSourcesJar()
 }
 
 jar {