diff --git a/app/build.gradle b/app/build.gradle
index fcfcac9..5836151 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,7 +3,7 @@ apply plugin: 'kotlin-android'
 
 ext.ver_major = 1
 ext.ver_minor = 0
-ext.ver_patch = 3
+ext.ver_patch = 4
 ext.min_sdk   = 19
 
 private Integer gen_version_code()
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 93ea022..f541f27 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -31,14 +31,14 @@
     public <fields>;
 }
 
--keepclasseswithmembers class android.databinding.ObservableInt {
+-keepclasseswithmembers class androidx.databinding.ObservableInt {
     void set(int);
 }
--keepclasseswithmembers class android.databinding.ObservableFloat {
+-keepclasseswithmembers class androidx.databinding.ObservableFloat {
     void set(float);
 }
 
--keepclasseswithmembers class android.support.v4.content.ContextCompat {
+-keepclasseswithmembers class androidx.core.content.ContextCompat {
     int getColor(android.content.Context, int);
 }
 -keepclasseswithmembers class org.mattvchandler.a2050.R$array {