diff --git a/src/components/SnippetManagerRedux.tsx b/src/components/SnippetManagerRedux.tsx
index ba1f934..ff5908b 100644
--- a/src/components/SnippetManagerRedux.tsx
+++ b/src/components/SnippetManagerRedux.tsx
@@ -182,15 +182,15 @@ export function SnippetManagerRedux() {
   }, [dispatch])
 
   const handleSelectAll = useCallback(() => {
-    if (selectedIds.size === filteredSnippets.length) {
+    if (selectedIds.length === filteredSnippets.length) {
       dispatch(clearSelection())
     } else {
       dispatch(selectAllSnippetsAction())
     }
-  }, [dispatch, filteredSnippets.length, selectedIds.size])
+  }, [dispatch, filteredSnippets.length, selectedIds.length])
 
   const handleBulkMove = useCallback(async (targetNamespaceId: string) => {
-    if (selectedIds.size === 0) {
+    if (selectedIds.length === 0) {
       toast.error('No snippets selected')
       return
     }
@@ -202,7 +202,7 @@ export function SnippetManagerRedux() {
       })).unwrap()
       
       const targetNamespace = namespaces.find(n => n.id === targetNamespaceId)
-      toast.success(`Moved ${selectedIds.size} snippet${selectedIds.size > 1 ? 's' : ''} to ${targetNamespace?.name || 'namespace'}`)
+      toast.success(`Moved ${selectedIds.length} snippet${selectedIds.length > 1 ? 's' : ''} to ${targetNamespace?.name || 'namespace'}`)
       
       if (selectedNamespaceId) {
         dispatch(fetchSnippetsByNamespace(selectedNamespaceId))
@@ -355,12 +355,12 @@ export function SnippetManagerRedux() {
             size="sm"
             onClick={handleSelectAll}
           >
-            {selectedIds.size === filteredSnippets.length ? 'Deselect All' : 'Select All'}
+            {selectedIds.length === filteredSnippets.length ? 'Deselect All' : 'Select All'}
           </Button>
-          {selectedIds.size > 0 && (
+          {selectedIds.length > 0 && (
             <>
               <span className="text-sm text-muted-foreground">
-                {selectedIds.size} selected
+                {selectedIds.length} selected
               </span>
               <DropdownMenu>
                 <DropdownMenuTrigger asChild>
@@ -402,7 +402,7 @@ export function SnippetManagerRedux() {
             onDelete={handleDeleteSnippet}
             onCopy={handleCopyCode}
             selectionMode={selectionMode}
-            isSelected={selectedIds.has(snippet.id)}
+            isSelected={selectedIds.includes(snippet.id)}
             onToggleSelect={handleToggleSnippetSelection}
           />
         ))}
diff --git a/src/store/index.ts b/src/store/index.ts
index 02fe968..9509ca3 100644
--- a/src/store/index.ts
+++ b/src/store/index.ts
@@ -11,9 +11,7 @@ export const store = configureStore({
     ui: uiReducer,
   },
   middleware: (getDefaultMiddleware) =>
-    getDefaultMiddleware({
-      serializableCheck: false,
-    }).concat(persistenceMiddleware),
+    getDefaultMiddleware().concat(persistenceMiddleware),
   devTools: {
     name: 'CodeSnippet',
     trace: true,
diff --git a/src/store/selectors.ts b/src/store/selectors.ts
index 3a35e23..8c729fa 100644
--- a/src/store/selectors.ts
+++ b/src/store/selectors.ts
@@ -39,5 +39,5 @@ export const selectFilteredSnippets = createSelector(
 
 export const selectSelectedSnippets = createSelector(
   [selectSnippets, selectSelectedIds],
-  (snippets, selectedIds) => snippets.filter(s => selectedIds.has(s.id))
+  (snippets, selectedIds) => snippets.filter(s => selectedIds.includes(s.id))
 )
diff --git a/src/store/slices/snippetsSlice.ts b/src/store/slices/snippetsSlice.ts
index 603ac3e..23fa06f 100644
--- a/src/store/slices/snippetsSlice.ts
+++ b/src/store/slices/snippetsSlice.ts
@@ -13,7 +13,7 @@ interface SnippetsState {
   items: Snippet[]
   loading: boolean
   error: string | null
-  selectedIds: Set<string>
+  selectedIds: string[]
   selectionMode: boolean
 }
 
@@ -21,7 +21,7 @@ const initialState: SnippetsState = {
   items: [],
   loading: false,
   error: null,
-  selectedIds: new Set(),
+  selectedIds: [],
   selectionMode: false,
 }
 
@@ -88,23 +88,22 @@ const snippetsSlice = createSlice({
     toggleSelectionMode: (state) => {
       state.selectionMode = !state.selectionMode
       if (!state.selectionMode) {
-        state.selectedIds = new Set()
+        state.selectedIds = []
       }
     },
     toggleSnippetSelection: (state, action: PayloadAction<string>) => {
-      const newSet = new Set(state.selectedIds)
-      if (newSet.has(action.payload)) {
-        newSet.delete(action.payload)
+      const index = state.selectedIds.indexOf(action.payload)
+      if (index !== -1) {
+        state.selectedIds.splice(index, 1)
       } else {
-        newSet.add(action.payload)
+        state.selectedIds.push(action.payload)
       }
-      state.selectedIds = newSet
     },
     clearSelection: (state) => {
-      state.selectedIds = new Set()
+      state.selectedIds = []
     },
     selectAllSnippets: (state) => {
-      state.selectedIds = new Set(state.items.map(s => s.id))
+      state.selectedIds = state.items.map(s => s.id)
     },
   },
   extraReducers: (builder) => {
@@ -152,7 +151,7 @@ const snippetsSlice = createSlice({
             snippet.namespaceId = targetNamespaceId
           }
         })
-        state.selectedIds = new Set()
+        state.selectedIds = []
         state.selectionMode = false
       })
   },