Switch to Tcl/Tk 8.5.
diff --git a/PCbuild/pyproject.vsprops b/PCbuild/pyproject.vsprops
index 66b417f..bc9cc9d 100644
--- a/PCbuild/pyproject.vsprops
+++ b/PCbuild/pyproject.vsprops
@@ -94,18 +94,18 @@
 	/>
 	<UserMacro
 		Name="tcltkLib"
-		Value="$(tcltkDir)\lib\tcl84.lib $(tcltkDir)\lib\tk84.lib"
+		Value="$(tcltkDir)\lib\tcl85.lib $(tcltkDir)\lib\tk85.lib"
 	/>
 	<UserMacro
 		Name="tcltkLibDebug"
-		Value="$(tcltkDir)\lib\tcl84g.lib $(tcltkDir)\lib\tk84g.lib"
+		Value="$(tcltkDir)\lib\tcl85g.lib $(tcltkDir)\lib\tk85g.lib"
 	/>
 	<UserMacro
 		Name="tcltk64Lib"
-		Value="$(tcltk64Dir)\lib\tcl84.lib $(tcltk64Dir)\lib\tk84.lib"
+		Value="$(tcltk64Dir)\lib\tcl85.lib $(tcltk64Dir)\lib\tk85.lib"
 	/>
 	<UserMacro
 		Name="tcltk64LibDebug"
-		Value="$(tcltk64Dir)\lib\tcl84g.lib $(tcltk64Dir)\lib\tk84g.lib"
+		Value="$(tcltk64Dir)\lib\tcl85g.lib $(tcltk64Dir)\lib\tk85g.lib"
 	/>
 </VisualStudioPropertySheet>