diff --git a/phirSOFT.IoInteraction/packages.config b/phirSOFT.IoInteraction/packages.config
index 806a780..0a2ebc4 100644
--- a/phirSOFT.IoInteraction/packages.config
+++ b/phirSOFT.IoInteraction/packages.config
@@ -2,6 +2,6 @@
 
 <packages>
   <package id="CommonServiceLocator" version="1.3" targetFramework="net46" />
-  <package id="Prism.Core" version="6.3.0" targetFramework="net46" />
+  <package id="Prism.Core" version="8.1.97" targetFramework="net46" />
   <package id="Prism.Wpf" version="6.3.0" targetFramework="net46" />
 </packages>
\ No newline at end of file