diff --git a/app/build.gradle b/app/build.gradle
index d0781f5e..15707645 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,8 +3,8 @@ plugins {
 }
 
 android {
-    compileSdkVersion 28
-    ndkVersion '21.3.6528147'
+    compileSdkVersion project.properties.compileSdkVersion.toInteger()
+    ndkVersion project.properties.ndkVersion
 
     dependencies {
         implementation "androidx.annotation:annotation:1.1.0"
@@ -15,8 +15,8 @@ android {
 
     defaultConfig {
         applicationId "com.termux"
-        minSdkVersion 24
-        targetSdkVersion 28
+        minSdkVersion project.properties.minSdkVersion.toInteger()
+        targetSdkVersion project.properties.targetSdkVersion.toInteger()
         versionCode 96
         versionName "0.96"
 
diff --git a/gradle.properties b/gradle.properties
index e9645a39..945ab5d2 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -14,3 +14,8 @@
 # org.gradle.parallel=true
 org.gradle.jvmargs=-Xmx2048M
 android.useAndroidX=true
+
+minSdkVersion=24
+targetSdkVersion=28
+ndkVersion=21.3.6528147
+compileSdkVersion=28
diff --git a/terminal-emulator/build.gradle b/terminal-emulator/build.gradle
index d54d185e..4b37b792 100644
--- a/terminal-emulator/build.gradle
+++ b/terminal-emulator/build.gradle
@@ -17,12 +17,12 @@ ext {
 }
 
 android {
-    compileSdkVersion 28
-    ndkVersion '21.3.6528147'
+    compileSdkVersion project.properties.compileSdkVersion.toInteger()
+    ndkVersion project.properties.ndkVersion
 
     defaultConfig {
-        minSdkVersion 21
-        targetSdkVersion 28
+        minSdkVersion project.properties.minSdkVersion.toInteger()
+        targetSdkVersion project.properties.targetSdkVersion.toInteger()
 
         externalNativeBuild {
             ndkBuild {
diff --git a/terminal-view/build.gradle b/terminal-view/build.gradle
index 3aad1644..6c672ddb 100644
--- a/terminal-view/build.gradle
+++ b/terminal-view/build.gradle
@@ -17,7 +17,7 @@ ext {
 }
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion project.properties.compileSdkVersion.toInteger()
 
     dependencies {
         implementation "androidx.annotation:annotation:1.1.0"
@@ -25,8 +25,8 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion 21
-        targetSdkVersion 28
+        minSdkVersion project.properties.minSdkVersion.toInteger()
+        targetSdkVersion project.properties.targetSdkVersion.toInteger()
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }