diff --git a/Changes.md b/Changes.md
index faaca9c84..21f382cfc 100644
--- a/Changes.md
+++ b/Changes.md
@@ -1,4 +1,4 @@
-MAD-X master
+MAD-X release 5.09.01 (2023.12.04)
 
 *  PTC:
     * [PR 1200](https://github.com/MethodicalAcceleratorDesign/MAD-X/pull/1200) See more details in this [presentation](https://indico.cern.ch/event/1310491/contributions/5513625/attachments/2690007/4667862/Review%20of%20MADX-PTC.pdf) (J. M. Gray, L. Deniau)
diff --git a/VERSION b/VERSION
index 8bc7d22c6..83a872106 100644
--- a/VERSION
+++ b/VERSION
@@ -1,3 +1,3 @@
-VERSION      = 5.09.00
-VERSION_NUM  = 50900
-VERSION_DATE = 2023.05.05
+VERSION      = 5.09.01
+VERSION_NUM  = 50901
+VERSION_DATE = 2023.12.04