diff --git a/Packages/Interval_arithmetic/changes.txt b/Packages/Interval_arithmetic/changes.txt
index 53cf19293e3..3b4de20eaa5 100644
--- a/Packages/Interval_arithmetic/changes.txt
+++ b/Packages/Interval_arithmetic/changes.txt
@@ -1,6 +1,6 @@
 Changes done to the Interval Arithmetic package.
 
-Version 4.50 on ?? June 2000
+Version 4.50 on 28 June 2000
 - Replaced template by complete overloaded functions for true/false for sign,
   compare, abs and square, for M$ VC++.
 - Qualified min and max by std:: for doubles.
diff --git a/Packages/Interval_arithmetic/version b/Packages/Interval_arithmetic/version
index 80d68d1037d..ff08c95ea7c 100644
--- a/Packages/Interval_arithmetic/version
+++ b/Packages/Interval_arithmetic/version
@@ -1 +1 @@
-4.49 (21 Jun 2000)
+4.50 (28 Jun 2000)