diff --git a/Packages/Interval_arithmetic/version b/Packages/Interval_arithmetic/version
index 1c9bcd477e8..b262885cf99 100644
--- a/Packages/Interval_arithmetic/version
+++ b/Packages/Interval_arithmetic/version
@@ -1 +1 @@
-4.58 (13 Sep 2000)
+4.59 (13 Dec 2000)