diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionStoreMigration.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionStoreMigration.kt
index ba102a7a48..2b7e9a04a1 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionStoreMigration.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionStoreMigration.kt
@@ -64,6 +64,7 @@ import org.matrix.android.sdk.internal.database.migration.MigrateSessionTo044
 import org.matrix.android.sdk.internal.database.migration.MigrateSessionTo045
 import org.matrix.android.sdk.internal.database.migration.MigrateSessionTo046
 import org.matrix.android.sdk.internal.database.migration.MigrateSessionTo047
+import org.matrix.android.sdk.internal.database.migration.MigrateSessionTo048
 import org.matrix.android.sdk.internal.util.Normalizer
 import org.matrix.android.sdk.internal.util.database.MatrixRealmMigration
 import javax.inject.Inject
@@ -72,7 +73,7 @@ internal class RealmSessionStoreMigration @Inject constructor(
         private val normalizer: Normalizer
 ) : MatrixRealmMigration(
         dbName = "Session",
-        schemaVersion = 47L,
+        schemaVersion = 48L,
 ) {
     /**
      * Forces all RealmSessionStoreMigration instances to be equal.
@@ -129,5 +130,6 @@ internal class RealmSessionStoreMigration @Inject constructor(
         if (oldVersion < 45) MigrateSessionTo045(realm).perform()
         if (oldVersion < 46) MigrateSessionTo046(realm).perform()
         if (oldVersion < 47) MigrateSessionTo047(realm).perform()
+        if (oldVersion < 48) MigrateSessionTo048(realm).perform()
     }
 }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/migration/MigrateSessionTo048.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/migration/MigrateSessionTo048.kt
new file mode 100644
index 0000000000..f9bd8ae7aa
--- /dev/null
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/migration/MigrateSessionTo048.kt
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2023 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.internal.database.migration
+
+import io.realm.DynamicRealm
+import org.matrix.android.sdk.internal.database.model.PollResponseAggregatedSummaryEntityFields
+import org.matrix.android.sdk.internal.database.model.UnableToDecryptEventEntityFields
+import org.matrix.android.sdk.internal.util.database.RealmMigrator
+
+/**
+ * Adding a new field in poll summary to keep track of non decrypted related events.
+ * Adding a new entity UnableToDecryptEventEntity.
+ */
+internal class MigrateSessionTo048(realm: DynamicRealm) : RealmMigrator(realm, 47) {
+
+    override fun doMigrate(realm: DynamicRealm) {
+        realm.schema.get("PollResponseAggregatedSummaryEntity")
+                ?.addRealmListField(PollResponseAggregatedSummaryEntityFields.ENCRYPTED_RELATED_EVENT_IDS.`$`, String::class.java)
+
+        realm.schema.create("UnableToDecryptEventEntity")
+                ?.addField(UnableToDecryptEventEntityFields.EVENT_ID, String::class.java)
+                ?.setRequired(UnableToDecryptEventEntityFields.EVENT_ID, true)
+    }
+}