diff --git a/icu.spec b/icu.spec
index b5ae202bf0afc100424d1baa7548ae83315e2eed..27b2516dc0f86f2f7c676c0491296e6ea92c7c8c 100644
--- a/icu.spec
+++ b/icu.spec
@@ -1,22 +1,19 @@
-%bcond_with build_compat
+%bcond_without build_compat
 
 %if %{with build_compat}
-%define compat_version 76.1
+%define compat_version 77.1
 %define compat_tarballver %(echo %compat_version|tr '.' '_')
 %define compat_dashver %(echo %compat_version|tr '.' '-')
 %endif
 
-%define tarballver %(echo %version|tr '.' '_')
-%define dashver %(echo %version|tr '.' '-')
-
 Name:      icu
-Version:   77.1
-Release:   2
+Version:   78.1
+Release:   1
 Summary:   International Components for Unicode
 License:   Unicode-DFS-2016 AND BSD-2-Clause AND BSD-3-Clause AND Public Domain
 URL:       https://icu.unicode.org/
-Source0:   https://github.com/unicode-org/icu/releases/download/release-%{dashver}/icu4c-%{tarballver}-src.tgz
-Source1:   https://github.com/unicode-org/icu/releases/download/release-%{dashver}/icu4c-%{tarballver}-data.zip
+Source0:   https://github.com/unicode-org/icu/releases/download/release-%{version}/icu4c-%{version}-sources.tgz
+Source1:   https://github.com/unicode-org/icu/releases/download/release-%{version}/icu4c-%{version}-data.zip
 Source2:   icu-config.sh
 %if %{with build_compat}
 Source10:  https://github.com/unicode-org/icu/releases/download/release-%{compat_dashver}/icu4c-%{compat_tarballver}-src.tgz
@@ -176,8 +173,10 @@ popd
 %{_mandir}/man1/*
 %{_mandir}/man8/*
 
-
 %changelog
+* Fri Oct 31 2025 Funda Wang <fundawang@yeah.net> - 78.1-1
+- update to 78.1
+
 * Tue May 20 2025 Funda Wang <fundawang@yeah.net> - 77.1-2
 - do not build compat lib for icu 76
 
diff --git a/icu4c-78.1-data.zip b/icu4c-78.1-data.zip
new file mode 100644
index 0000000000000000000000000000000000000000..e907bf2059ae17087c2c824f86de3040ac577ec6
--- /dev/null
+++ b/icu4c-78.1-data.zip
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e7b652244f27194e0ea46a0d21cfc714ee8a818e1fd82d51a93bc91516fdcf65
+size 20187894
diff --git a/icu4c-78.1-sources.tgz b/icu4c-78.1-sources.tgz
new file mode 100644
index 0000000000000000000000000000000000000000..f67838b8fde07cb888f7e61e7aa7280e7efcca1d
--- /dev/null
+++ b/icu4c-78.1-sources.tgz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6217f58ca39b23127605cfc6c7e0d3475fe4b0d63157011383d716cb41617886
+size 27979449