diff --git a/.gitignore b/.gitignore
index ea7f8ef..b3d5172 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 SOURCES/javazic-1.8-37392f2f5d59.tar.xz
 SOURCES/javazic.tar.gz
-SOURCES/tzcode2021a.tar.gz
-SOURCES/tzdata2021a.tar.gz
+SOURCES/tzcode2021c.tar.gz
+SOURCES/tzdata2021c.tar.gz
diff --git a/.tzdata.metadata b/.tzdata.metadata
index d8da3c4..3e64660 100644
--- a/.tzdata.metadata
+++ b/.tzdata.metadata
@@ -1,4 +1,4 @@
 77292e1839952807567570118e01405b405af80c SOURCES/javazic-1.8-37392f2f5d59.tar.xz
 ee8ad215161cd132e65e2be447b279457158b540 SOURCES/javazic.tar.gz
-a32c48108536f4e1cfc2b53ae502fd280e679c2a SOURCES/tzcode2021a.tar.gz
-a22a72dbe159402753a7d78ec0aa1cba6148b106 SOURCES/tzdata2021a.tar.gz
+9cd599b2680fa6fc304e90da8217abca64003714 SOURCES/tzcode2021c.tar.gz
+c7fcf11452aa77ef3a709149cafb54aedd9ecedf SOURCES/tzdata2021c.tar.gz
diff --git a/SPECS/tzdata.spec b/SPECS/tzdata.spec
index 28c31ae..2f43c27 100644
--- a/SPECS/tzdata.spec
+++ b/SPECS/tzdata.spec
@@ -1,8 +1,8 @@
 Summary: Timezone data
 Name: tzdata
-Version: 2021a
-%define tzdata_version 2021a
-%define tzcode_version 2021a
+Version: 2021c
+%define tzdata_version 2021c
+%define tzcode_version 2021c
 Release: 1%{?dist}
 License: Public Domain
 Group: System Environment/Base
@@ -149,6 +149,33 @@ echo ============END TESTING===========
 %{_datadir}/javazi-1.8
 
 %changelog
+* Mon Oct 04 2021 Patsy Griffin <patsy@redhat.com> - 2021c-1
+- Rebase to tzdata-2021c
+  - Revert most of 2021b changes to 'backward'.
+  - Fix 'zic -b fat' bug in pre-1970 32-bit data.
+  - Fix two Link line typos.
+  - Distribute SECURITY file.
+
+* Wed Sep 29 2021 Patsy Griffin <patsy@redhat.com> - 2021b-2
+- Bump release.
+
+* Sat Sep 25 2021 Patsy Griffin <patsy@redhat.com> - 2021b-1
+- Rebase to tzdata-2021b
+  - Innclude patch for Mayen
+  - Jordan now starts DST on February's last Thursday.
+  - Samoa no longer observes DST.
+  - Merge more location-based Zones whose timestamps agree since 1970.
+  - Move some backward-compatibility links to 'backward'.
+  - Rename Pacific/Enderbury to Pacific/Kanton.
+  - Correct many pre-1993 transitions in Malawi, Portugal, etc.
+  - zic now creates each output file or link atomically.
+  - zic -L no longer omits the POSIX TZ string in its output.
+  - zic fixes for truncation and leap second table expiration.
+  - zic now follows POSIX for TZ strings using all-year DST.
+  - Fix some localtime crashes and bugs in obscure cases.
+  - zdump -v now outputs more-useful boundary cases.
+  - tzfile.5 better matches a draft successor to RFC 8536.
+
 * Sun Jan 24 2021 Patsy Griffin <patsy@redhat.com> - 2021a-1
 - Rebase to tzdata-2021a
   - South Sudan will change from +03 to +02 on 2021-02-01.