diff --git a/debian.changelog b/debian.changelog
index 0380384..088b855 100644
--- a/debian.changelog
+++ b/debian.changelog
@@ -1,4 +1,4 @@
-gromox (1.36.23.3447095) unstable; urgency=low
+gromox (2.20) unstable; urgency=low
 
   * Initial package.
 
diff --git a/gromox-2.19.tar.asc b/gromox-2.19.tar.asc
deleted file mode 100644
index 416cd8e..0000000
--- a/gromox-2.19.tar.asc
+++ /dev/null
@@ -1,7 +0,0 @@
------BEGIN PGP SIGNATURE-----
-
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-j7XqAQCVL9w3lfrrlSaFdETM5bxL48OLnzyIBsdoQ3kueswyPAD/fRqUFpIiTHyu
-916WG37MFU/RVwg22ZlcKiPkmVKOzQE=
-=DgAf
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diff --git a/gromox-2.19.tar.zst b/gromox-2.19.tar.zst
deleted file mode 100644
index c95349d..0000000
--- a/gromox-2.19.tar.zst
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:3f5b42e73bf99d0b3214be5a2bf5ab8767d1b668932c669aa4c020668574670c
-size 2085568
diff --git a/gromox-2.20.tar.asc b/gromox-2.20.tar.asc
new file mode 100644
index 0000000..d06b1a0
--- /dev/null
+++ b/gromox-2.20.tar.asc
@@ -0,0 +1,7 @@
+-----BEGIN PGP SIGNATURE-----
+
+iHUEABYKAB0WIQS8oMXDCcrFaedKkhz3bv5dDCI6jwUCZXwyyQAKCRD3bv5dDCI6
+j6clAP9QsP2G1AJh7MLSTxLAzimblWetkIyaMVHvd6kW5STbzAEAzkfVx3CaDAiv
+WhlZDUQWKrEUmV3PJjzUL/vskLAiygs=
+=p7qe
+-----END PGP SIGNATURE-----
diff --git a/gromox-2.20.tar.zst b/gromox-2.20.tar.zst
new file mode 100644
index 0000000..11c5492
--- /dev/null
+++ b/gromox-2.20.tar.zst
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:556d095cf172cd376cd345fc4874fa3459858502ac9fc7915786223539565118
+size 2093367
diff --git a/gromox.changes b/gromox.changes
index 285ca1a..1666dc3 100644
--- a/gromox.changes
+++ b/gromox.changes
@@ -1,3 +1,21 @@
+-------------------------------------------------------------------
+Fri Dec 15 10:00:02 UTC 2023 - Jan Engelhardt <jengelh@inai.de>
+
+- Update to release 2.20
+  * oxdisco: allow autodiscover for room/equipment stores
+  * oxcical: allday events are now emitted (pursuant to the
+    ``oxcical_allday_ymd`` config directive) as "floating time"
+    per the OXCICAL spec recommendations
+  * oxcical: resolve integer underflow that botched weekorder
+    computation in weekly-recurring events
+  * oxcical: resolve out-of-bounds access during generation of
+    iCal RDATE lines * ews: avoid a heap-use-after-free during
+    freebusy retrieval
+  * zcore: zs_getuserfreebusy had failed to resolve usernames and
+    display freebusy status in the scheduling matrix view
+  * ldap_adaptor: resolve data race with double-free when
+    per-organization LDAP settings were used
+
 -------------------------------------------------------------------
 Mon Dec  4 14:12:37 UTC 2023 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/gromox.dsc b/gromox.dsc
index 678b7ba..b639f1f 100644
--- a/gromox.dsc
+++ b/gromox.dsc
@@ -1,7 +1,7 @@
 Format: 1.0
 Source: gromox
 Architecture: any
-Version: 2.19
+Version: 2.20
 DEBTRANSFORM-RELEASE: 1
 Maintainer: Gromox <null@gromox.com>
 Homepage: https://gromox.com
diff --git a/gromox.spec b/gromox.spec
index 5b8c094..31b1ba4 100644
--- a/gromox.spec
+++ b/gromox.spec
@@ -19,7 +19,7 @@
 %define _libexecdir %_prefix/libexec
 
 Name:           gromox
-Version:        2.19
+Version:        2.20
 Release:        0
 Summary:        Groupware server backend with RPC, IMAP,POP3, PHP-MAPI support
 License:        AGPL-3.0-or-later AND GPL-2.0-only AND GPL-3.0-or-later