diff --git a/komga/src/main/kotlin/org/gotson/komga/domain/model/SeriesSearch.kt b/komga/src/main/kotlin/org/gotson/komga/domain/model/SeriesSearch.kt
index b3d44d84b..ccd8c7db2 100644
--- a/komga/src/main/kotlin/org/gotson/komga/domain/model/SeriesSearch.kt
+++ b/komga/src/main/kotlin/org/gotson/komga/domain/model/SeriesSearch.kt
@@ -2,7 +2,7 @@ package org.gotson.komga.domain.model
 
 open class SeriesSearch(
   val libraryIds: Collection<String>? = null,
-  val collectionIds: Collection<Long>? = null,
+  val collectionIds: Collection<String>? = null,
   val searchTerm: String? = null,
   val metadataStatus: Collection<SeriesMetadata.Status>? = null,
   val publishers: Collection<String>? = null
@@ -10,7 +10,7 @@ open class SeriesSearch(
 
 class SeriesSearchWithReadProgress(
   libraryIds: Collection<String>? = null,
-  collectionIds: Collection<Long>? = null,
+  collectionIds: Collection<String>? = null,
   searchTerm: String? = null,
   metadataStatus: Collection<SeriesMetadata.Status>? = null,
   publishers: Collection<String>? = null,
diff --git a/komga/src/main/kotlin/org/gotson/komga/interfaces/rest/SeriesController.kt b/komga/src/main/kotlin/org/gotson/komga/interfaces/rest/SeriesController.kt
index cf828b76f..fd2a4cdc2 100644
--- a/komga/src/main/kotlin/org/gotson/komga/interfaces/rest/SeriesController.kt
+++ b/komga/src/main/kotlin/org/gotson/komga/interfaces/rest/SeriesController.kt
@@ -74,7 +74,7 @@ class SeriesController(
     @AuthenticationPrincipal principal: KomgaPrincipal,
     @RequestParam(name = "search", required = false) searchTerm: String?,
     @RequestParam(name = "library_id", required = false) libraryIds: List<String>?,
-    @RequestParam(name = "collection_id", required = false) collectionIds: List<Long>?,
+    @RequestParam(name = "collection_id", required = false) collectionIds: List<String>?,
     @RequestParam(name = "status", required = false) metadataStatus: List<SeriesMetadata.Status>?,
     @RequestParam(name = "read_status", required = false) readStatus: List<ReadStatus>?,
     @RequestParam(name = "publisher", required = false) publishers: List<String>?,