diff --git a/CHANGES.md b/CHANGES.md
index b9f953b4cc..d343dfe5b4 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -34,6 +34,7 @@ Bugfix 🐛:
  - Fix crash when trying to download file without internet connection (#1229)
  - Local echo are not updated in timeline (for failed & encrypted states)
  - Render image event even if thumbnail_info does not have mimetype defined (#1209)
+ - RiotX now uses as many threads as it needs to do work and send messages (#1221)
  - Fix issue with media path (#1227)
 
 Translations 🗣:
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/Matrix.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/Matrix.kt
index 22ac0324cf..4c6e3ea3bd 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/Matrix.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/Matrix.kt
@@ -33,6 +33,7 @@ import im.vector.matrix.android.internal.util.BackgroundDetectionObserver
 import org.matrix.olm.OlmManager
 import java.io.InputStream
 import java.util.concurrent.atomic.AtomicBoolean
+import java.util.concurrent.Executors
 import javax.inject.Inject
 
 data class MatrixConfiguration(
@@ -61,7 +62,7 @@ class Matrix private constructor(context: Context, matrixConfiguration: MatrixCo
         Monarchy.init(context)
         DaggerMatrixComponent.factory().create(context, matrixConfiguration).inject(this)
         if (context.applicationContext !is Configuration.Provider) {
-            WorkManager.initialize(context, Configuration.Builder().build())
+            WorkManager.initialize(context, Configuration.Builder().setExecutor(Executors.newCachedThreadPool()).build())
         }
         ProcessLifecycleOwner.get().lifecycle.addObserver(backgroundDetectionObserver)
     }
diff --git a/vector/src/main/java/im/vector/riotx/VectorApplication.kt b/vector/src/main/java/im/vector/riotx/VectorApplication.kt
index 680550e818..2bceb38b75 100644
--- a/vector/src/main/java/im/vector/riotx/VectorApplication.kt
+++ b/vector/src/main/java/im/vector/riotx/VectorApplication.kt
@@ -56,6 +56,7 @@ import im.vector.riotx.features.version.VersionProvider
 import im.vector.riotx.push.fcm.FcmHelper
 import timber.log.Timber
 import java.text.SimpleDateFormat
+import java.util.concurrent.Executors
 import java.util.Date
 import java.util.Locale
 import javax.inject.Inject
@@ -146,7 +147,7 @@ class VectorApplication : Application(), HasVectorInjector, MatrixConfiguration.
 
     override fun providesMatrixConfiguration() = MatrixConfiguration(BuildConfig.FLAVOR_DESCRIPTION)
 
-    override fun getWorkManagerConfiguration() = androidx.work.Configuration.Builder().build()
+    override fun getWorkManagerConfiguration() = androidx.work.Configuration.Builder().setExecutor(Executors.newCachedThreadPool()).build()
 
     override fun injector(): VectorComponent {
         return vectorComponent