diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 3442b921a..845acc6c6 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -35,12 +35,6 @@
   void onResponse(org.json.JSONObject);
 }
 
-# Fragments
-# TODO: Remove when AGP 4.1 release
-# https://issuetracker.google.com/issues/142601969
--keep,allowobfuscation class * extends androidx.fragment.app.Fragment
--keepnames class androidx.navigation.fragment.NavHostFragment
-
 # Strip Timber verbose and debug logging
 -assumenosideeffects class timber.log.Timber.Tree {
   public void v(**);
diff --git a/build.gradle.kts b/build.gradle.kts
index 12bbfd093..03ed4b8e2 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -37,7 +37,7 @@ fun Task.applyOptimize() = doLast {
     val aapt2 = Paths.get(project.android.sdkDirectory.path,
         "build-tools", project.android.buildToolsVersion, "aapt2")
     val zip = Paths.get(project.buildDir.path, "intermediates",
-        "processed_res", "release", "out", "resources-release.ap_")
+        "shrunk_processed_res", "release", "resources-release-stripped.ap_")
     val optimized = File("${zip}.opt")
     val cmd = exec {
         commandLine(aapt2, "optimize", "--collapse-resource-names",
@@ -45,6 +45,7 @@ fun Task.applyOptimize() = doLast {
         isIgnoreExitValue = true
     }
     if (cmd.exitValue == 0) {
+        zip.toFile().delete()
         optimized.renameTo(zip.toFile())
     }
 }
@@ -63,6 +64,7 @@ subprojects {
             android.apply {
                 compileSdkVersion(30)
                 buildToolsVersion = "30.0.2"
+                ndkPath = "${System.getenv("ANDROID_HOME")}/ndk/magisk"
 
                 defaultConfig {
                     if (minSdkVersion == null)
@@ -87,8 +89,8 @@ subprojects {
         }
 
         tasks.whenTaskAdded {
-            if (name == "processReleaseResources") {
-                finalizedBy(tasks.create("optimizeReleaseResources").applyOptimize())
+            if (name == "shrinkReleaseRes") {
+                finalizedBy(tasks.create("optimizeReleaseRes").applyOptimize())
             }
         }
 
diff --git a/build.py b/build.py
index 4871d40d4..733b13abc 100755
--- a/build.py
+++ b/build.py
@@ -55,8 +55,8 @@ arch64 = ['arm64-v8a', 'x86_64']
 support_targets = ['magisk', 'magiskinit', 'magiskboot', 'magiskpolicy', 'resetprop', 'busybox', 'test']
 default_targets = ['magisk', 'magiskinit', 'magiskboot', 'busybox']
 
-ndk_ver = '21c'
-ndk_ver_full = '21.2.6472646'
+ndk_ver = '21d'
+ndk_ver_full = '21.3.6528147'
 
 ndk_root = op.join(os.environ['ANDROID_HOME'], 'ndk')
 ndk_path = op.join(ndk_root, 'magisk')
@@ -285,8 +285,8 @@ def dump_bin_headers():
 def build_binary(args):
     # Verify NDK install
     props = parse_props(op.join(ndk_path, 'source.properties'))
-    if 'Pkg.Revision.orig' not in props or props['Pkg.Revision.orig'] != ndk_ver_full:
-        error('Incorrect NDK. Please setup NDK with "build.py ndk"')
+    if props['Pkg.Revision'] != ndk_ver_full:
+        error('Incorrect NDK. Please install/upgrade NDK with "build.py ndk"')
 
     if args.target:
         args.target = set(args.target) & set(support_targets)
@@ -550,15 +550,6 @@ def setup_ndk(args):
       for path in copy_tree(src_dir, lib_dir):
           vprint(f'Replaced {path}')
 
-    # Rewrite source.properties
-    src_prop = op.join(ndk_path, 'source.properties')
-    props = parse_props(src_prop)
-    props['Pkg.Revision.orig'] = props['Pkg.Revision']
-    props['Pkg.Revision'] = '99.99.99'
-    with open(src_prop, 'w') as p:
-        for key, val in props.items():
-            print(f'{key} = {val}', file=p)
-
 
 def build_all(args):
     vars(args)['target'] = []
diff --git a/native/build.gradle.kts b/native/build.gradle.kts
index 9ed21750a..59bc7ae97 100644
--- a/native/build.gradle.kts
+++ b/native/build.gradle.kts
@@ -4,8 +4,6 @@ plugins {
 
 android {
 
-    ndkVersion = "99.99.99"
-
     externalNativeBuild {
         ndkBuild {
             path("jni/Android.mk")