diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 66bf6f798..ae41837ad 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -20,6 +20,9 @@ fun generateVersionName() = "${Config.versionMajor}.${Config.versionMinor}.${Con
 val apkPrefix get() = System.getenv("TAG") ?: "kiwix"
 
 android {
+  // Added namespace in response to Gradle 8.0 and above.
+  // This is now specified in the Gradle configuration instead of declaring
+  // it directly in the AndroidManifest file.
   namespace = "org.kiwix.kiwixmobile"
   defaultConfig {
     base.archivesName.set(apkPrefix)
diff --git a/buildSrc/src/main/kotlin/plugin/AllProjectConfigurer.kt b/buildSrc/src/main/kotlin/plugin/AllProjectConfigurer.kt
index 7bff2971e..406df427a 100644
--- a/buildSrc/src/main/kotlin/plugin/AllProjectConfigurer.kt
+++ b/buildSrc/src/main/kotlin/plugin/AllProjectConfigurer.kt
@@ -43,9 +43,18 @@ class AllProjectConfigurer {
     target.plugins.apply("androidx.navigation.safeargs")
   }
 
-  fun configureBaseExtension(target: Project) {
+  fun configureBaseExtension(target: Project, isLibrary: Boolean) {
     target.configureExtension<BaseExtension> {
-      namespace = ""
+      // The namespace cannot be directly set in `LibraryExtension`.
+      // The core module is configured as a library for both Kiwix and custom apps.
+      // Therefore, we set the namespace in `BaseExtension` for the core module,
+      // based on the boolean value of `isLibrary`. This value is passed from the
+      // `KiwixConfigurationPlugin`. If the current plugin is `LibraryPlugin`,
+      // indicating it is the core module, then this value will be true,
+      // and we set the namespace accordingly.
+      if (isLibrary) {
+        namespace = "org.kiwix.kiwixmobile.core"
+      }
       setCompileSdkVersion(Config.compileSdk)
       defaultConfig {
         minSdk = Config.minSdk
diff --git a/buildSrc/src/main/kotlin/plugin/KiwixConfigurationPlugin.kt b/buildSrc/src/main/kotlin/plugin/KiwixConfigurationPlugin.kt
index 855e973f8..7f9973fb0 100644
--- a/buildSrc/src/main/kotlin/plugin/KiwixConfigurationPlugin.kt
+++ b/buildSrc/src/main/kotlin/plugin/KiwixConfigurationPlugin.kt
@@ -33,10 +33,10 @@ class KiwixConfigurationPlugin : Plugin<Project> {
     target.plugins.all {
       when (this) {
         is LibraryPlugin -> {
-          doDefaultConfiguration(target)
+          doDefaultConfiguration(target, true)
         }
         is AppPlugin -> {
-          doDefaultConfiguration(target)
+          doDefaultConfiguration(target, false)
           appConfigurer.configure(target)
         }
       }
@@ -47,8 +47,8 @@ class KiwixConfigurationPlugin : Plugin<Project> {
     allProjectConfigurer.configureJacoco(target)
   }
 
-  private fun doDefaultConfiguration(target: Project) {
-    allProjectConfigurer.configureBaseExtension(target)
+  private fun doDefaultConfiguration(target: Project, isLibrary: Boolean) {
+    allProjectConfigurer.configureBaseExtension(target, isLibrary)
     allProjectConfigurer.configureCommonExtension(target)
   }
 }
diff --git a/custom/build.gradle.kts b/custom/build.gradle.kts
index 584bbc8d7..c2b921dab 100644
--- a/custom/build.gradle.kts
+++ b/custom/build.gradle.kts
@@ -30,6 +30,10 @@ android {
   productFlavors.apply {
     CustomApps.createDynamically(project.file("src"), this)
     all {
+      // Added namespace for every custom app to make it compatible with gradle 8.0 and above.
+      // This is now specified in the Gradle configuration instead of declaring
+      // it directly in the AndroidManifest file.
+      namespace = "org.kiwix.kiwixcustom$name"
       File("$projectDir/src", "$name/$name.zim").let {
         createDownloadTask(it)
         createPublishApkWithExpansionTask(it, applicationVariants)
diff --git a/custom/src/main/AndroidManifest.xml b/custom/src/main/AndroidManifest.xml
index 4d24c4b47..56a8462a9 100644
--- a/custom/src/main/AndroidManifest.xml
+++ b/custom/src/main/AndroidManifest.xml
@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-  xmlns:tools="http://schemas.android.com/tools"
-  package="org.kiwix.kiwixmobile.custom">
+  xmlns:tools="http://schemas.android.com/tools">
 
 
   <application