diff --git a/build.gradle b/build.gradle
index c97b769b..b51f4bb0 100644
--- a/build.gradle
+++ b/build.gradle
@@ -59,7 +59,6 @@ dependencies {
 	api 'org.jsoup:jsoup:1.17.2'
 	implementation 'org.json:json:20240303'
 	implementation 'androidx.collection:collection:1.4.0'
-	implementation 'org.jetbrains.kotlinx:kotlinx-io-core:0.3.4'
 
 	ksp project(':kotatsu-parsers-ksp')
 
diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/MangaLoaderContext.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/MangaLoaderContext.kt
index 0e755d14..c5eaeb9e 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/MangaLoaderContext.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/MangaLoaderContext.kt
@@ -45,6 +45,9 @@ abstract class MangaLoaderContext {
 		redraw: (image: Bitmap) -> Bitmap
 	): Response
 
+	/**
+	 * create a new empty Bitmap with given dimensions
+	 */
 	abstract fun createBitmap(
 		width: Int,
 		height: Int
diff --git a/src/test/kotlin/org/koitharu/kotatsu/parsers/MangaLoaderContextMock.kt b/src/test/kotlin/org/koitharu/kotatsu/parsers/MangaLoaderContextMock.kt
index 08d5b646..f7cecee5 100644
--- a/src/test/kotlin/org/koitharu/kotatsu/parsers/MangaLoaderContextMock.kt
+++ b/src/test/kotlin/org/koitharu/kotatsu/parsers/MangaLoaderContextMock.kt
@@ -4,6 +4,7 @@ import com.koushikdutta.quack.QuackContext
 import okhttp3.OkHttpClient
 import okhttp3.Request
 import okhttp3.Response
+import org.koitharu.kotatsu.parsers.bitmap.Bitmap
 import org.koitharu.kotatsu.parsers.config.MangaSourceConfig
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.parsers.network.UserAgents
@@ -45,6 +46,14 @@ internal object MangaLoaderContextMock : MangaLoaderContext() {
 
 	override fun getDefaultUserAgent(): String = UserAgents.FIREFOX_MOBILE
 
+	override fun redrawImageResponse(response: Response, redraw: (image: Bitmap) -> Bitmap): Response {
+		return response
+	}
+
+	override fun createBitmap(width: Int, height: Int): Bitmap {
+		throw UnsupportedOperationException()
+	}
+
 	suspend fun doRequest(url: String, source: MangaSource?): Response {
 		val request = Request.Builder()
 			.get()