diff --git a/sources b/sources
index 076e42c..1d8dadd 100644
--- a/sources
+++ b/sources
@@ -1,4 +1,4 @@
 6a3392cd5f1594d13c12c1a836ac8d91  javazic.tar.gz
 e36d2f742c22f8c8dbf0686ac9769b55  tzdata-base-0.tar.bz2
-d60f168fb7307d8c1b926c7dc3a6c5c1  tzdata2011a.tar.gz
-001db5591974e6db7797a90cbdcbbadc  tzcode2011a.tar.gz
+9eaf3ca354c42a32bd28e623539bf0e0  tzdata2011b.tar.gz
+c63a1425f7252aef1fe54a258cdccff8  tzcode2011b.tar.gz
diff --git a/tzdata.spec b/tzdata.spec
index 9b8448c..9dbb1fd 100644
--- a/tzdata.spec
+++ b/tzdata.spec
@@ -1,8 +1,8 @@
 Summary: Timezone data
 Name: tzdata
-Version: 2011a
-%define tzdata_version 2011a
-%define tzcode_version 2011a
+Version: 2011b
+%define tzdata_version 2011b
+%define tzcode_version 2011b
 Release: 1%{?dist}
 License: Public Domain
 Group: System Environment/Base
@@ -111,6 +111,11 @@ rm -rf %{buildroot}
 %{_datadir}/javazi
 
 %changelog
+* Wed Feb 09 2011 Petr Machata <pmachata@redhat.com> - 2011b-1
+- Upstream 2011b:
+  - America/North_Dakota/Beulah: Mercer County, North Dakota, changed
+    from the mountain time zone to the central time zone
+
 * Mon Jan 24 2011 Petr Machata <pmachata@redhat.com> - 2011a-1
 - Upstream 2011a:
   - Updates of historical stamps for Hawaii