Anyone facing when export PDF, replace same file name will fail ?

When i using indesign doing the text book, after complete. I doing export PDF, but after few a min my client ask for changes, i update again content pages and export again. Just direct replace it. But weird thing is showing previous version. And i export few time replace still showing previous version. Any one facing this problem before? 

*I using indesign CC and Adobe acobat pro