diff --git a/.gitignore b/.gitignore
index f4ca566..714f3b0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -220,3 +220,5 @@ noarch/
 /tzdata2025a.tar.gz
 /tzcode2025b.tar.gz
 /tzdata2025b.tar.gz
+/tzcode2025c.tar.gz
+/tzdata2025c.tar.gz
diff --git a/plans/ci.fmf b/plans/main.fmf
similarity index 50%
rename from plans/ci.fmf
rename to plans/main.fmf
index 85710d6..ec17042 100644
--- a/plans/ci.fmf
+++ b/plans/main.fmf
@@ -1,6 +1,5 @@
-summary: CI Gating Plan
+summary: Main Plan
 discover:
     how: fmf
-    directory: tests
 execute:
     how: tmt
diff --git a/sources b/sources
index 5da021f..0b8efef 100644
--- a/sources
+++ b/sources
@@ -1,3 +1,3 @@
 SHA512 (javazic-1.8-37392f2f5d59.tar.xz) = 2ba718dfeed53a3bd6b44e3dfe96338a609e482e4e6d942e2a7e622fc6c52606cb323ac3a59739c463e34f70fff217c0a61f5b3d3c4958eff2801b1504ee4204
-SHA512 (tzcode2025b.tar.gz) = 19826b12968c10fc4db7e4b07ba782bfb8590eeebaec6f719d74b92a2e642ab817bd72bceff0015ce52a838edfdb00753b3cd87dd84b35abf2606e5bee445f76
-SHA512 (tzdata2025b.tar.gz) = 7d83741f3cae81fac8131994b43c55b6da7328df18b706e5ee40e9b3212bc506e6f8fc90988b18da424ed59eff69bce593f2783b7b5f18eb483a17aeb94258d6
+SHA512 (tzcode2025c.tar.gz) = d14bc0680b9cb33d6526a2c0e483f2abafc2593cfe5fbfe7dcab940aafdc1baaec065dbaa1bb58b03586a8631ffdf43ebb22ff5a70503298b6ea2cf061d82c16
+SHA512 (tzdata2025c.tar.gz) = 1e33f7212fd0ae2ad3c16e68f0c1fc7a6ad26a126b8406c379a5768d79604c6a816054bd0fe3a63228d70cd6a1fc2b1bae2a9f8014e102d3727eb9d21affa1f1
diff --git a/tests/Sanity/trivial_case/date.golden b/tests/Sanity/trivial_case/date.golden
new file mode 100644
index 0000000..645a868
--- /dev/null
+++ b/tests/Sanity/trivial_case/date.golden
@@ -0,0 +1,320 @@
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+Australia/West 2003-02-03 22:43:22 UTC -> Tue Feb  4 06:43:22 AWST 2003
+Australia/West 2004-08-03 22:43:22 UTC -> Wed Aug  4 06:43:22 AWST 2004
+Australia/West 2004-02-03 22:43:22 UTC -> Wed Feb  4 06:43:22 AWST 2004
+Australia/West 2005-08-03 22:43:22 UTC -> Thu Aug  4 06:43:22 AWST 2005
+Australia/West 2005-02-03 22:43:22 UTC -> Fri Feb  4 06:43:22 AWST 2005
+Australia/West 2006-08-03 22:43:22 UTC -> Fri Aug  4 06:43:22 AWST 2006
+Australia/West 2006-02-03 22:43:22 UTC -> Sat Feb  4 06:43:22 AWST 2006
+Australia/West 2007-08-03 22:43:22 UTC -> Sat Aug  4 06:43:22 AWST 2007
+Australia/West 2007-02-03 22:43:22 UTC -> Sun Feb  4 07:43:22 AWDT 2007
+Australia/South 2003-08-03 22:43:22 UTC -> Mon Aug  4 08:13:22 ACST 2003
+Australia/South 2003-02-03 22:43:22 UTC -> Tue Feb  4 09:13:22 ACDT 2003
+Australia/South 2004-08-03 22:43:22 UTC -> Wed Aug  4 08:13:22 ACST 2004
+Australia/South 2004-02-03 22:43:22 UTC -> Wed Feb  4 09:13:22 ACDT 2004
+Australia/South 2005-08-03 22:43:22 UTC -> Thu Aug  4 08:13:22 ACST 2005
+Australia/South 2005-02-03 22:43:22 UTC -> Fri Feb  4 09:13:22 ACDT 2005
+Australia/South 2006-08-03 22:43:22 UTC -> Fri Aug  4 08:13:22 ACST 2006
+Australia/South 2006-02-03 22:43:22 UTC -> Sat Feb  4 09:13:22 ACDT 2006
+Australia/South 2007-08-03 22:43:22 UTC -> Sat Aug  4 08:13:22 ACST 2007
+Australia/South 2007-02-03 22:43:22 UTC -> Sun Feb  4 09:13:22 ACDT 2007
+Australia/Melbourne 2003-08-03 22:43:22 UTC -> Mon Aug  4 08:43:22 AEST 2003
+Australia/Melbourne 2003-02-03 22:43:22 UTC -> Tue Feb  4 09:43:22 AEDT 2003
+Australia/Melbourne 2004-08-03 22:43:22 UTC -> Wed Aug  4 08:43:22 AEST 2004
+Australia/Melbourne 2004-02-03 22:43:22 UTC -> Wed Feb  4 09:43:22 AEDT 2004
+Australia/Melbourne 2005-08-03 22:43:22 UTC -> Thu Aug  4 08:43:22 AEST 2005
+Australia/Melbourne 2005-02-03 22:43:22 UTC -> Fri Feb  4 09:43:22 AEDT 2005
+Australia/Melbourne 2006-08-03 22:43:22 UTC -> Fri Aug  4 08:43:22 AEST 2006
+Australia/Melbourne 2006-02-03 22:43:22 UTC -> Sat Feb  4 09:43:22 AEDT 2006
+Australia/Melbourne 2007-08-03 22:43:22 UTC -> Sat Aug  4 08:43:22 AEST 2007
+Australia/Melbourne 2007-02-03 22:43:22 UTC -> Sun Feb  4 09:43:22 AEDT 2007
+Australia/Sydney 2003-08-03 22:43:22 UTC -> Mon Aug  4 08:43:22 AEST 2003
+Australia/Sydney 2003-02-03 22:43:22 UTC -> Tue Feb  4 09:43:22 AEDT 2003
+Australia/Sydney 2004-08-03 22:43:22 UTC -> Wed Aug  4 08:43:22 AEST 2004
+Australia/Sydney 2004-02-03 22:43:22 UTC -> Wed Feb  4 09:43:22 AEDT 2004
+Australia/Sydney 2005-08-03 22:43:22 UTC -> Thu Aug  4 08:43:22 AEST 2005
+Australia/Sydney 2005-02-03 22:43:22 UTC -> Fri Feb  4 09:43:22 AEDT 2005
+Australia/Sydney 2006-08-03 22:43:22 UTC -> Fri Aug  4 08:43:22 AEST 2006
+Australia/Sydney 2006-02-03 22:43:22 UTC -> Sat Feb  4 09:43:22 AEDT 2006
+Australia/Sydney 2007-08-03 22:43:22 UTC -> Sat Aug  4 08:43:22 AEST 2007
+Australia/Sydney 2007-02-03 22:43:22 UTC -> Sun Feb  4 09:43:22 AEDT 2007
+Australia/North 2003-08-03 22:43:22 UTC -> Mon Aug  4 08:13:22 ACST 2003
+Australia/North 2003-02-03 22:43:22 UTC -> Tue Feb  4 08:13:22 ACST 2003
+Australia/North 2004-08-03 22:43:22 UTC -> Wed Aug  4 08:13:22 ACST 2004
+Australia/North 2004-02-03 22:43:22 UTC -> Wed Feb  4 08:13:22 ACST 2004
+Australia/North 2005-08-03 22:43:22 UTC -> Thu Aug  4 08:13:22 ACST 2005
+Australia/North 2005-02-03 22:43:22 UTC -> Fri Feb  4 08:13:22 ACST 2005
+Australia/North 2006-08-03 22:43:22 UTC -> Fri Aug  4 08:13:22 ACST 2006
+Australia/North 2006-02-03 22:43:22 UTC -> Sat Feb  4 08:13:22 ACST 2006
+Australia/North 2007-08-03 22:43:22 UTC -> Sat Aug  4 08:13:22 ACST 2007
+Australia/North 2007-02-03 22:43:22 UTC -> Sun Feb  4 08:13:22 ACST 2007
+Asia/Tokyo 2003-08-03 22:43:22 UTC -> Mon Aug  4 07:43:22 JST 2003
+Asia/Tokyo 2003-02-03 22:43:22 UTC -> Tue Feb  4 07:43:22 JST 2003
+Asia/Tokyo 2004-08-03 22:43:22 UTC -> Wed Aug  4 07:43:22 JST 2004
+Asia/Tokyo 2004-02-03 22:43:22 UTC -> Wed Feb  4 07:43:22 JST 2004
+Asia/Tokyo 2005-08-03 22:43:22 UTC -> Thu Aug  4 07:43:22 JST 2005
+Asia/Tokyo 2005-02-03 22:43:22 UTC -> Fri Feb  4 07:43:22 JST 2005
+Asia/Tokyo 2006-08-03 22:43:22 UTC -> Fri Aug  4 07:43:22 JST 2006
+Asia/Tokyo 2006-02-03 22:43:22 UTC -> Sat Feb  4 07:43:22 JST 2006
+Asia/Tokyo 2007-08-03 22:43:22 UTC -> Sat Aug  4 07:43:22 JST 2007
+Asia/Tokyo 2007-02-03 22:43:22 UTC -> Sun Feb  4 07:43:22 JST 2007
+Asia/Istanbul 2003-08-03 22:43:22 UTC -> Mon Aug  4 01:43:22 EEST 2003
+Asia/Istanbul 2003-02-03 22:43:22 UTC -> Tue Feb  4 00:43:22 EET 2003
+Asia/Istanbul 2004-08-03 22:43:22 UTC -> Wed Aug  4 01:43:22 EEST 2004
+Asia/Istanbul 2004-02-03 22:43:22 UTC -> Wed Feb  4 00:43:22 EET 2004
+Asia/Istanbul 2005-08-03 22:43:22 UTC -> Thu Aug  4 01:43:22 EEST 2005
+Asia/Istanbul 2005-02-03 22:43:22 UTC -> Fri Feb  4 00:43:22 EET 2005
+Asia/Istanbul 2006-08-03 22:43:22 UTC -> Fri Aug  4 01:43:22 EEST 2006
+Asia/Istanbul 2006-02-03 22:43:22 UTC -> Sat Feb  4 00:43:22 EET 2006
+Asia/Istanbul 2007-08-03 22:43:22 UTC -> Sat Aug  4 01:43:22 EEST 2007
+Asia/Istanbul 2007-02-03 22:43:22 UTC -> Sun Feb  4 00:43:22 EET 2007
+Asia/Vladivostok 2003-08-03 22:43:22 UTC -> Mon Aug  4 09:43:22 +11 2003
+Asia/Vladivostok 2003-02-03 22:43:22 UTC -> Tue Feb  4 08:43:22 +10 2003
+Asia/Vladivostok 2004-08-03 22:43:22 UTC -> Wed Aug  4 09:43:22 +11 2004
+Asia/Vladivostok 2004-02-03 22:43:22 UTC -> Wed Feb  4 08:43:22 +10 2004
+Asia/Vladivostok 2005-08-03 22:43:22 UTC -> Thu Aug  4 09:43:22 +11 2005
+Asia/Vladivostok 2005-02-03 22:43:22 UTC -> Fri Feb  4 08:43:22 +10 2005
+Asia/Vladivostok 2006-08-03 22:43:22 UTC -> Fri Aug  4 09:43:22 +11 2006
+Asia/Vladivostok 2006-02-03 22:43:22 UTC -> Sat Feb  4 08:43:22 +10 2006
+Asia/Vladivostok 2007-08-03 22:43:22 UTC -> Sat Aug  4 09:43:22 +11 2007
+Asia/Vladivostok 2007-02-03 22:43:22 UTC -> Sun Feb  4 08:43:22 +10 2007
+Asia/Bangkok 2003-08-03 22:43:22 UTC -> Mon Aug  4 05:43:22 +07 2003
+Asia/Bangkok 2003-02-03 22:43:22 UTC -> Tue Feb  4 05:43:22 +07 2003
+Asia/Bangkok 2004-08-03 22:43:22 UTC -> Wed Aug  4 05:43:22 +07 2004
+Asia/Bangkok 2004-02-03 22:43:22 UTC -> Wed Feb  4 05:43:22 +07 2004
+Asia/Bangkok 2005-08-03 22:43:22 UTC -> Thu Aug  4 05:43:22 +07 2005
+Asia/Bangkok 2005-02-03 22:43:22 UTC -> Fri Feb  4 05:43:22 +07 2005
+Asia/Bangkok 2006-08-03 22:43:22 UTC -> Fri Aug  4 05:43:22 +07 2006
+Asia/Bangkok 2006-02-03 22:43:22 UTC -> Sat Feb  4 05:43:22 +07 2006
+Asia/Bangkok 2007-08-03 22:43:22 UTC -> Sat Aug  4 05:43:22 +07 2007
+Asia/Bangkok 2007-02-03 22:43:22 UTC -> Sun Feb  4 05:43:22 +07 2007
diff --git a/tests/Sanity/trivial_case/datetimes b/tests/Sanity/trivial_case/datetimes
new file mode 100644
index 0000000..88d4735
--- /dev/null
+++ b/tests/Sanity/trivial_case/datetimes
@@ -0,0 +1,10 @@
+2003-08-03 22:43:22 UTC
+2003-02-03 22:43:22 UTC
+2004-08-03 22:43:22 UTC
+2004-02-03 22:43:22 UTC
+2005-08-03 22:43:22 UTC
+2005-02-03 22:43:22 UTC
+2006-08-03 22:43:22 UTC
+2006-02-03 22:43:22 UTC
+2007-08-03 22:43:22 UTC
+2007-02-03 22:43:22 UTC
diff --git a/tests/Sanity/trivial_case/main.fmf b/tests/Sanity/trivial_case/main.fmf
new file mode 100644
index 0000000..09494ed
--- /dev/null
+++ b/tests/Sanity/trivial_case/main.fmf
@@ -0,0 +1,10 @@
+summary: tzdata testing by trivial case
+component:
+- tzdata
+test: ./test.sh
+tier: 1
+framework: beakerlib
+require+:
+- tzdata
+- coreutils
+duration: 5m
diff --git a/tests/Sanity/trivial_case/test.sh b/tests/Sanity/trivial_case/test.sh
new file mode 100755
index 0000000..c23dfc9
--- /dev/null
+++ b/tests/Sanity/trivial_case/test.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+
+. /usr/share/beakerlib/beakerlib.sh || exit 1
+
+PACKAGE="tzdata"
+REQUIRES="$PACKAGE coreutils glibc"
+export LC_TIME=C
+
+rlJournalStart
+  rlPhaseStartSetup
+    rlShowRunningKernel
+    rlAssertRpm --all
+    rlRun "TmpDir=\$(mktemp -d)"
+    rlRun "cp zones datetimes date.golden $TmpDir"
+    rlRun "pushd $TmpDir"
+  rlPhaseEnd
+
+  rlPhaseStartTest "run test"
+    while read timezone; do
+      rlLogInfo "timezone: $timezone"
+      while read datetime; do
+	echo -n "$timezone $datetime -> " >>date.log
+        rlRun "TZ=$timezone date -d \"$datetime\" >>date.log"
+      done <datetimes
+    done <zones
+    rlRun "rlFileSubmit ./date.log date.log"
+  rlPhaseEnd
+
+  rlPhaseStartTest "evaluate results"
+    if ! rlRun "diff -u date.golden date.log >date.diff"; then
+      rlFail "Differences observed";
+      rlRun "rlFileSubmit ./date.diff date.diff"
+    fi    
+  rlPhaseEnd
+
+  rlPhaseStartCleanup
+    rlRun "popd"
+    rlRun "rm -r $TmpDir"
+  rlPhaseEnd
+rlJournalPrintText
+rlJournalEnd
diff --git a/tests/Sanity/trivial_case/zones b/tests/Sanity/trivial_case/zones
new file mode 100644
index 0000000..df2b323
--- /dev/null
+++ b/tests/Sanity/trivial_case/zones
@@ -0,0 +1,32 @@
+Europe/Berlin
+Europe/Paris
+Europe/London
+Europe/Prague
+US/Alaska
+US/Aleutian
+US/Arizona
+US/Central
+US/Eastern
+US/East-Indiana
+US/Hawaii
+US/Indiana-Starke
+US/Michigan
+US/Mountain
+US/Pacific
+US/Samoa
+America/Bahia
+America/Bogota
+America/Costa_Rica
+America/Jamaica
+America/Mexico_City
+America/Santiago
+Australia/Brisbane
+Australia/West
+Australia/South
+Australia/Melbourne
+Australia/Sydney
+Australia/North
+Asia/Tokyo
+Asia/Istanbul
+Asia/Vladivostok
+Asia/Bangkok
diff --git a/tzdata.spec b/tzdata.spec
index 62e77e0..db52d01 100644
--- a/tzdata.spec
+++ b/tzdata.spec
@@ -1,8 +1,8 @@
 Summary: Timezone data
 Name: tzdata
-Version: 2025b
-%define tzdata_version 2025b
-%define tzcode_version 2025b
+Version: 2025c
+%define tzdata_version 2025c
+%define tzcode_version 2025c
 Release: 1%{?dist}
 License: LicenseRef-Fedora-Public-Domain AND (GPL-2.0-only WITH ClassPath-exception-2.0)
 URL: https://www.iana.org/time-zones
@@ -15,12 +15,15 @@ Patch003: 0003-continue-to-ship-posixrules.patch
 BuildRequires: make
 BuildRequires: gcc
 BuildRequires: gawk, glibc, perl-interpreter
-BuildRequires: java-devel
+BuildRequires: java-25-devel
 BuildRequires: glibc-common >= 2.5.90-7
 Conflicts: glibc-common <= 2.3.2-63
 BuildArchitectures: noarch
 ExcludeArch: i686
 
+# Using '--with vanguard' will change the data format to the new vanguard form.
+%bcond_with vanguard
+
 %description
 This package contains data files with rules for various timezones around
 the world.
@@ -43,17 +46,21 @@ This package contains timezone information for use by Java runtimes.
 %patch -p1 -P 3
 %endif
 
+# zic now defaults to "-b slim" to control data bloat.
+# This can cause build issues for some packages.
+# For now, build with ZFLAGS="-b fat" for backward compatibitliy.
+
 # tzdata-2018g introduced 25:00 transition times.  This breaks OpenJDK.
 # Use rearguard for java
 mkdir rearguard
-make VERSION=%{version} tzdata%{version}-rearguard.tar.gz
+make VERSION=%{version} ZFLAGS="-b fat" tzdata%{version}-rearguard.tar.gz.t
 mv tzdata%{version}-rearguard.tar.gz rearguard
 pushd rearguard
 tar zxf tzdata%{version}-rearguard.tar.gz
 popd
 
 %if 0%{?rhel}
-# Use rearguard for rhel (overwrite default vangaurd data)
+# Use rearguard for rhel (overwrite default dataform)
 tar zxf rearguard/tzdata%{version}-rearguard.tar.gz
 %endif
 
@@ -66,8 +73,10 @@ echo "%{name}%{tzdata_version}" >> VERSION
 %build
 # Run make to create the tzdata.zi file
 rm tzdata.zi
-%if 0%{?rhel}
-make VERSION=%{version} DATAFORM=rearguard tzdata.zi
+%if %{with vanguard}
+make VERSION=%{version} ZFLAGS="-b fat" DATAFORM=vanguard tzdata.zi
+%elif 0%{?rhel}
+make VERSION=%{version} ZFLAGS="-b fat" DATAFORM=rearguard tzdata.zi
 %else
 make tzdata.zi
 %endif
@@ -76,9 +85,9 @@ FILES="africa antarctica asia australasia europe northamerica southamerica
        etcetera backward factory"
 
 mkdir zoneinfo/{,posix,right}
-zic -y ./yearistype -d zoneinfo -L /dev/null -p America/New_York $FILES
-zic -y ./yearistype -d zoneinfo/posix -L /dev/null $FILES
-zic -y ./yearistype -d zoneinfo/right -L leapseconds $FILES
+zic -b fat -y ./yearistype -d zoneinfo -L /dev/null -p America/New_York $FILES
+zic -b fat -y ./yearistype -d zoneinfo/posix -L /dev/null $FILES
+zic -b fat -y ./yearistype -d zoneinfo/right -L leapseconds $FILES
 
 # grep -v tz-art.htm tz-link.htm > tz-link.html
 
@@ -137,6 +146,16 @@ echo ============END TESTING===========
 %{_datadir}/javazi-1.8
 
 %changelog
+* Sun Dec 14 2025 Patsy Griffin <patsy@redhat.com> - 2025c-1
+  Update to tzdata-2025c (#2421294)
+  - Update the expiration date for the leap seconds files.
+
+* Tue Jul 29 2025 jiri vanek <jvanek@redhat.com> - 2025b-3
+- Rebuilt for java-25-openjdk as preffered jdk
+
+* Fri Jul 25 2025 Fedora Release Engineering <releng@fedoraproject.org> - 2025b-2
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild
+
 * Thu Mar 27 2025 Patsy Griffin <patsy@redhat.com> - 2025b-1
   Update to tzdata-2025b (#2354293)
   - Chile's Aysén Region moves from -04/-03 to -03 year-round,
@@ -150,8 +169,11 @@ echo ============END TESTING===========
   - Includes improvements to pre-1991 data for the Philippines.
   - Etc/Unknown is now reserved.
 
-* Wed Jan 08 2025 Patsy Griffin <patsy@redhat.com> - 2024b-1
-- Rebase to tzdata-2024b (#2310315)
+* Sun Jan 19 2025 Fedora Release Engineering <releng@fedoraproject.org> - 2024b-2
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild
+
+* Thu Dec 12 2024 Patsy Griffin <patsy@redhat.com> - 2024b-1
+- Update to tzdata-2024b (#2310315)
   - Improve historical data for Mexico, Mongolia, and Portugal.
   - System V names are now obsolescent.
   - The main data form now uses %z.
@@ -162,14 +184,27 @@ echo ============END TESTING===========
   - Include two upstream patches for month names as in April vs Apr.
 - Harden against links to removed zones
 
+* Sat Jul 20 2024 Fedora Release Engineering <releng@fedoraproject.org> - 2024a-9
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild
+
+* Tue May 28 2024 Patsy Griffin <patsy@redhat.com> - 2024a-8
+- zic now defaults to "-b slim" to control data bloat.
+  For now, build with ZFLAGS="-b fat" for backward compatibitliy.
+
+* Tue May 14 2024 Miro Hrončok <mhroncok@redhat.com> - 2024a-7
+- Rebuilt with glibc-2.39.9000-10 to avoid regressions described in rhbz#2280403
+
+* Fri Apr 26 2024 Jonathan Wakely <jwakely@redhat.com> - 2024a-6
+- Add support for --with vanguard
+
 * Thu Apr 04 2024 Patsy Griffin <patsy@redhat.com> - 2024a-5
 - Add java patch to fix incorrect calculations for
   Africa/Casablanca starting in 2027. (#2266311)
 
-* Wed Mar 13 2024 Patsy Griffin <patsy@redhat.com> - 2024a-4
-- Remove hardcoded versioned path to javac.
+* Sat Mar 02 2024 Andrew Hughes <gnu.andrew@redhat.com> - 2024a-4
+- Remove hardcoded versioned path to javac
 
-* Sat Mar 02 2024 Jiri Vanek <jvanek@redhat.com> - 2024a-3
+* Tue Feb 27 2024 Jiri Vanek <jvanek@redhat.com> - 2024a-3
 - Rebuilt for java-21-openjdk as system jdk
 
 * Tue Feb 06 2024 Patsy Griffin <patsy@redhat.com> - 2024a-2