diff --git a/dios/dios.py b/dios/dios.py
index d1d182e7e23122bc11f23c6889a97274ec5d6496..7af955c1ecf59217ce5997bb6740b5e513f65704 100644
--- a/dios/dios.py
+++ b/dios/dios.py
@@ -641,6 +641,10 @@ class DictOfSeries:
         else:
             return DictOfSeries(data=data, itype=self.itype, cast_policy=self._policy, fastpath=True)
 
+    def isin(self, values):
+        data = self._fast_apply('isin', values=values)
+        return DictOfSeries(data=data, itype=self.itype, cast_policy=self._policy, fastpath=True)
+
     def memory_usage(self, index=True, deep=False):
         mem = 0
         for k in self.columns: