diff --git a/Android.bp b/Android.bp
index d2612e0..703f949 100644
--- a/Android.bp
+++ b/Android.bp
@@ -33,6 +33,7 @@ messaging_java_defaults {
     soong_config_variables: {
         build_variant_eng: {
             optimize: {
+                keep_runtime_invisible_annotations: true,
                 proguard_flags_files: [
                     "proguard.flags",
                     "proguard-test.flags",
@@ -40,6 +41,7 @@ messaging_java_defaults {
             },
             conditions_default: {
                 optimize: {
+                    keep_runtime_invisible_annotations: true,
                     proguard_flags_files: [
                         "proguard.flags",
                         "proguard-release.flags",
diff --git a/OWNERS b/OWNERS
index f4ccae0..f881f49 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,3 @@
 # Default code reviewers picked from top 3 or more developers.
 # Please update this list if you find better candidates.
 tomtaylor@google.com
-rtenneti@google.com
diff --git a/proguard.flags b/proguard.flags
index f319a02..f7b3dbc 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -15,20 +15,49 @@
 #
 # Keep enough data for stack traces
 -renamesourcefileattribute SourceFile
--keepattributes SourceFile,LineNumberTable,*Annotation*
+-keepattributes SourceFile,
+                LineNumberTable,
+                RuntimeVisibleAnnotations,
+                RuntimeVisibleParameterAnnotations,
+                RuntimeVisibleTypeAnnotations,
+                AnnotationDefault
 
 -keep class com.android.messaging.* { *; }
 -keep class com.android.messaging.*.* { *; }
 -keep class com.android.messaging.*.*.* { *; }
 
--keep public class * extends android.app.Activity
--keep public class * extends android.app.Application
--keep public class * extends android.app.Service
--keep public class * extends android.content.BroadcastReceiver
--keep public class * extends android.content.ContentProvider
--keep public class * extends android.app.backup.BackupAgentHelper
--keep public class * extends android.preference.Preference
--keep public class * extends androidx.fragment.app.Fragment
+# TODO(b/373579455): Evaluate if <init> needs to be kept.
+-keep public class * extends android.app.Activity {
+  void <init>();
+}
+# TODO(b/373579455): Evaluate if <init> needs to be kept.
+-keep public class * extends android.app.Application {
+  void <init>();
+}
+# TODO(b/373579455): Evaluate if <init> needs to be kept.
+-keep public class * extends android.app.Service {
+  void <init>();
+}
+# TODO(b/373579455): Evaluate if <init> needs to be kept.
+-keep public class * extends android.content.BroadcastReceiver {
+  void <init>();
+}
+# TODO(b/373579455): Evaluate if <init> needs to be kept.
+-keep public class * extends android.content.ContentProvider {
+  void <init>();
+}
+# TODO(b/373579455): Evaluate if <init> needs to be kept.
+-keep public class * extends android.app.backup.BackupAgentHelper {
+  void <init>();
+}
+# TODO(b/373579455): Evaluate if <init> needs to be kept.
+-keep public class * extends android.preference.Preference {
+  void <init>();
+}
+# TODO(b/373579455): Evaluate if <init> needs to be kept.
+-keep public class * extends androidx.fragment.app.Fragment {
+  void <init>();
+}
 -keep public class com.android.vcard.* { *; }
 
 -keep class androidx.collection.* { *; }