diff --git a/Packages/Interval_arithmetic/version b/Packages/Interval_arithmetic/version
index ff9fb2d60ce..e40e2481a6e 100644
--- a/Packages/Interval_arithmetic/version
+++ b/Packages/Interval_arithmetic/version
@@ -1 +1 @@
-4.130 (20 Feb 2002)
+4.131 (15 Mar 2002)