Bootstrap datepicker not working after postback in updatepanel

<div class="col-md-6">
    <div class="form-group">
        <label for="userEmail">Session:</label>
        <asp:TextBox ID="txtDate5"    runat="server"  ></asp:TextBox>
        <script>
        $('#<%=txtDate5.ClientID %>').datepicker({
            uiLibrary: 'bootstrap4'
        });
        </script>
        <asp:RequiredFieldValidator ID="Req_ID"
            Display="Dynamic" runat="server"
            ControlToValidate="txtDate5"
            InitialValue="0"
            ErrorMessage="Please Select Session" 
            Style=" color:red"
        >
        </asp:RequiredFieldValidator> 
    </div>
</div>