diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 206647ec6a..22460e48f0 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -161,8 +161,8 @@ dependencies {
     implementation(kotlin("reflect", version = Versions.kotlin))
 
     // JSON
-    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:${Versions.KOTLINSERIALIZATION}")
-    implementation("org.jetbrains.kotlinx:kotlinx-serialization-protobuf:${Versions.KOTLINSERIALIZATION}")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:${Versions.kotlinSerialization}")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-protobuf:${Versions.kotlinSerialization}")
     implementation("com.google.code.gson:gson:2.8.6")
     implementation("com.github.salomonbrys.kotson:kotson:2.5.0")
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/cache/ChapterCache.kt b/app/src/main/java/eu/kanade/tachiyomi/data/cache/ChapterCache.kt
index e6314d5ce8..c09028b7c7 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/cache/ChapterCache.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/cache/ChapterCache.kt
@@ -2,8 +2,6 @@ package eu.kanade.tachiyomi.data.cache
 
 import android.content.Context
 import android.text.format.Formatter
-import com.github.salomonbrys.kotson.fromJson
-import com.google.gson.Gson
 import com.jakewharton.disklrucache.DiskLruCache
 import eu.kanade.tachiyomi.data.database.models.Chapter
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
@@ -16,10 +14,12 @@ import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.drop
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
 import okhttp3.Response
 import okio.buffer
 import okio.sink
-import rx.Observable
 import uy.kohesive.injekt.injectLazy
 import java.io.File
 import java.io.IOException
@@ -52,7 +52,7 @@ class ChapterCache(private val context: Context) {
     }
 
     /** Google Json class used for parsing JSON files.  */
-    private val gson: Gson by injectLazy()
+    private val json: Json by injectLazy()
 
     private val preferences: PreferencesHelper by injectLazy()
 
@@ -127,17 +127,15 @@ class ChapterCache(private val context: Context) {
      * Get page list from cache.
      *
      * @param chapter the chapter.
-     * @return an observable of the list of pages.
+     * @return the list of pages.
      */
-    fun getPageListFromCache(chapter: Chapter): Observable<List<Page>> {
-        return Observable.fromCallable {
-            // Get the key for the chapter.
-            val key = DiskUtil.hashKeyForDisk(getKey(chapter))
+    fun getPageListFromCache(chapter: Chapter): List<Page> {
+        // Get the key for the chapter.
+        val key = DiskUtil.hashKeyForDisk(getKey(chapter))
 
-            // Convert JSON string to list of objects. Throws an exception if snapshot is null
-            diskCache.get(key).use {
-                gson.fromJson<List<Page>>(it.getString(0))
-            }
+        // Convert JSON string to list of objects. Throws an exception if snapshot is null
+        return diskCache.get(key).use {
+            json.decodeFromString(it.getString(0))
         }
     }
 
@@ -149,7 +147,7 @@ class ChapterCache(private val context: Context) {
      */
     fun putPageListToCache(chapter: Chapter, pages: List<Page>) {
         // Convert list of pages to json string.
-        val cachedValue = gson.toJson(pages)
+        val cachedValue = json.encodeToString(pages)
 
         // Initialize the editor (edits the values for an entry).
         var editor: DiskLruCache.Editor? = null
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/HttpPageLoader.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/HttpPageLoader.kt
index 6d6575e748..bc97aca2aa 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/HttpPageLoader.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/HttpPageLoader.kt
@@ -102,8 +102,7 @@ class HttpPageLoader(
      * the local cache, otherwise fallbacks to network.
      */
     override fun getPages(): Observable<List<ReaderPage>> {
-        return chapterCache
-            .getPageListFromCache(chapter.chapter)
+        return Observable.fromCallable { chapterCache.getPageListFromCache(chapter.chapter) }
             .onErrorResumeNext { source.fetchPageList(chapter.chapter) }
             .map { pages ->
                 pages.mapIndexed { index, page ->
diff --git a/buildSrc/src/main/kotlin/Dependencies.kt b/buildSrc/src/main/kotlin/Dependencies.kt
index 12c665e2aa..e326dcf0e1 100644
--- a/buildSrc/src/main/kotlin/Dependencies.kt
+++ b/buildSrc/src/main/kotlin/Dependencies.kt
@@ -7,7 +7,6 @@ object Versions {
     const val NUCLEUS = "3.0.0"
     const val OSS_LICENSE = "17.0.0"
     const val RETROFIT = "2.7.2"
-    const val KOTLINSERIALIZATION = "1.0.1"
     const val ROBO_ELECTRIC = "3.1.4"
     const val RX_BINDING = "1.0.1"
     const val TIMBER = "4.7.1"
@@ -53,7 +52,7 @@ object Versions {
     const val junit = "4.13"
     const val kotlin = "1.4.32"
     const val kotlinCoroutines = "1.3.9"
-    const val kotlinSerialization = "1.0.1"
+    const val kotlinSerialization = "1.1.0"
     const val kotson = "2.5.0"
     const val ktlint = "9.4.0"
     const val loadingButton = "2.2.0"