Switch to bzip2 1.0.5.
diff --git a/PCbuild/pyproject.vsprops b/PCbuild/pyproject.vsprops
index bc9cc9d..48c6915 100644
--- a/PCbuild/pyproject.vsprops
+++ b/PCbuild/pyproject.vsprops
@@ -78,7 +78,7 @@
 	/>
 	<UserMacro
 		Name="bz2Dir"
-		Value="$(externalsDir)\bzip2-1.0.3"
+		Value="$(externalsDir)\bzip2-1.0.5"
 	/>
 	<UserMacro
 		Name="opensslDir"