diff --git a/sources b/sources
index 820be91..7d2aca8 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
 SHA512 (xtide-2.15.6.tar.xz) = cd24908a9f4541ab2b19444dba54aab92310e49d2ba0321d9bbcde9806d7cc975828cc5f22fe0a1a73cebf96f4ad1ccd1530c016e8b22f7d54675aeff9528c82
-SHA512 (harmonics-dwf-20251228-free.tar.xz) = d7710c2f0fcaf32ca8e017f073912db5e4d344dbc1710c2709766232d0c77d08b4cec65418f9c7196bb792271f0136a8a9fb59de021e8d4c0ad66c2c558ae87b
+SHA512 (harmonics-dwf-20241229-free.tar.xz) = f3e9a45a68faf3c56ef511b33625cf6022c9728809e6096449c93623ccd5c564a5705e836f16c227dd56b2671f39f124f027b031902ce2e688ee71639e93f5a9
diff --git a/xtide.spec b/xtide.spec
index 41061d0..735e0f3 100644
--- a/xtide.spec
+++ b/xtide.spec
@@ -1,8 +1,8 @@
 %define          mainver   2.15.6
 #%%define          betatag   dev-20160114
-%define          dwfdate   20251228
+%define          dwfdate   20241229
 
-%define          baserelease 4
+%define          baserelease 1
 
 
 %define          rel        %{?betatag:0.}%{baserelease}%{?betatag:.%(echo %betatag | sed -e 's|-||g')}
@@ -365,15 +365,6 @@ exit 0
 %endif
 
 %changelog
-* Wed Jan 14 2026 Jitka Plesnikova <jplesnik@redhat.com> - 2.15.6-4
-- Rebuild for new gpsd
-
-* Mon Dec 29 2025 Mamoru TASAKA <mtasaka@fedoraproject.org> - 2.15.6-3
-- Update harmonics data to 20251228
-
-* Fri Jul 25 2025 Fedora Release Engineering <releng@fedoraproject.org> - 2.15.6-2
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild
-
 * Sun Jun 29 2025 Mamoru TASAKA <mtasaka@fedoraproject.org> - 2.15.6-1
 - 2.15.6