diff --git a/.gitignore b/.gitignore
index 6807054..09de820 100644
--- a/.gitignore
+++ b/.gitignore
@@ -184,3 +184,5 @@ noarch/
 /tzdata2020f.tar.gz
 /tzcode2021a.tar.gz
 /tzdata2021a.tar.gz
+/tzcode2021b.tar.gz
+/tzdata2021b.tar.gz
diff --git a/0001-Fix-Jan-Mayen-typo.patch b/0001-Fix-Jan-Mayen-typo.patch
new file mode 100644
index 0000000..6e60061
--- /dev/null
+++ b/0001-Fix-Jan-Mayen-typo.patch
@@ -0,0 +1,29 @@
+From 2a7c7c5873ff0eb725e8eafad04f6af6ada66dc6 Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Sat, 25 Sep 2021 08:32:39 -0700
+Subject: [PROPOSED] Fix Jan Mayen typo
+
+Fix typo in 2021-09-24 revert of most of the 2021-05-19
+alike-since-1970 patch.  Problem reported by Chris Walton in:
+https://mm.icann.org/pipermail/tz/2021-September/030772.html
+* backward (Atlantic/Jan_Mayen): Link from Europe/Oslo,
+not Europe/Berlin.
+---
+ backward | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/backward b/backward
+index 7c288e3..5412c46 100644
+--- a/backward
++++ b/backward
+@@ -116,7 +116,7 @@ Link	Asia/Makassar		Asia/Ujung_Pandang
+ Link	Asia/Ulaanbaatar	Asia/Ulan_Bator
+ Link	Asia/Bangkok		Asia/Vientiane
+ Link	Atlantic/Faroe		Atlantic/Faeroe
+-Link	Europe/Berlin		Atlantic/Jan_Mayen
++Link	Europe/Oslo		Atlantic/Jan_Mayen
+ Link	Africa/Abidjan		Atlantic/St_Helena
+ Link	Australia/Sydney	Australia/ACT
+ Link	Australia/Sydney	Australia/Canberra
+-- 
+2.30.2
diff --git a/sources b/sources
index c532355..06f46a1 100644
--- a/sources
+++ b/sources
@@ -1,4 +1,4 @@
 SHA512 (javazic.tar.gz) = c23a4a437a87d0792f23e98025520a11273fc3d12ef5dcf64af8332ed60ba9ce77eaadfd234cee92b3ca9dc08b9e4123e804745925d68ddbd0b2e1e9039e526b
 SHA512 (javazic-1.8-37392f2f5d59.tar.xz) = 2ba718dfeed53a3bd6b44e3dfe96338a609e482e4e6d942e2a7e622fc6c52606cb323ac3a59739c463e34f70fff217c0a61f5b3d3c4958eff2801b1504ee4204
-SHA512 (tzcode2021a.tar.gz) = bf1d53bcbfecd3b09d57a9e6d3cb49b5dc5f8e1b6674b67e7f974e1a268c2aaf13ca89a7ef12f49d0665aff782bd72685e00c22a41ca88a028da0429f972fd45
-SHA512 (tzdata2021a.tar.gz) = 7cdd762ec90ce12a30fa36b1d66d1ea82d9fa21e514e2b9c7fcbe2541514ee0fadf30843ff352c65512fb270857b51d1517b45e1232b89c6f954ba9ff1833bb3
+SHA512 (tzcode2021b.tar.gz) = 00fca7508cfbc42123065fe8087397c9dd2acbdda96f3bb0936187825348cf13538f1893f2d02bd8bfa3465427ca7a9a65451baffe39889bc58ba0a77a047806
+SHA512 (tzdata2021b.tar.gz) = ca61d64af5ae791f337533c09d2b4f7caa645ecab7b9d13e9bcafc47c7c68535abe7c103c56bbd41d6bd913a8607f9c5187c8ce8a91b4891a750a643f89c8b51
diff --git a/tzdata.spec b/tzdata.spec
index 50011d6..cf3b1d4 100644
--- a/tzdata.spec
+++ b/tzdata.spec
@@ -1,14 +1,15 @@
 Summary: Timezone data
 Name: tzdata
-Version: 2021a
-%define tzdata_version 2021a
-%define tzcode_version 2021a
-Release: 2%{?dist}
+Version: 2021b
+%define tzdata_version 2021b
+%define tzcode_version 2021b
+Release: 1%{?dist}
 License: Public Domain
 URL: https://www.iana.org/time-zones
 Source0: ftp://ftp.iana.org/tz/releases/tzdata%{tzdata_version}.tar.gz
 Source1: ftp://ftp.iana.org/tz/releases/tzcode%{tzcode_version}.tar.gz
 
+Patch001: 0001-Fix-Jan-Mayen-typo.patch
 Patch002: 0002-Fix-have-snprintf-error.patch
 %if 0%{?rhel} || 0%{?eln}
 Patch003: 0003-continue-to-ship-posixrules.patch
@@ -41,6 +42,7 @@ This package contains timezone information for use by Java runtimes.
 %prep
 %setup -q -c -a 1
 
+%patch001 -p1
 %patch002 -p1
 %if 0%{?rhel} || 0%{?eln}
 %patch003 -p1
@@ -151,6 +153,22 @@ install -p -m 644 tzdb.dat $RPM_BUILD_ROOT%{_datadir}/javazi-1.8/
 %{_datadir}/javazi-1.8
 
 %changelog
+* Sat Sep 25 2021 Patsy Griffin <patsy@redhat.com> - 2021b-1
+- Rebase to tzdata-2021b
+  - 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.
+
 * Fri Jul 23 2021 Fedora Release Engineering <releng@fedoraproject.org> - 2021a-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild