diff --git a/DESCRIPTION b/DESCRIPTION
index 1d44f43d..bcf03123 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: lubridate
 Type: Package
-Version: 1.7.2
+Version: 1.7.3
 Title: Make Dealing with Dates a Little Easier
 Description: Functions to work with date-times and time-spans: fast and user
     friendly parsing of date-time data, extraction and updating of components of
diff --git a/NEWS.md b/NEWS.md
index 5080b7f6..baaafb67 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,9 @@
+Version 1.7.3
+=============
+
+### BUG FIXES
+
+* [#643](https://github.com/tidyverse/lubridate/issues/643), [#640](https://github.com/tidyverse/lubridate/issues/640), [#645](https://github.com/tidyverse/lubridate/issues/645) Fix faulty caching of system timezone.
 
 Version 1.7.2
 =============
@@ -23,7 +29,7 @@ Version 1.7.2
 Version 1.7.1
 =============
 
-## BUG FIXES
+### BUG FIXES
 
 * [#575](https://github.com/tidyverse/lubridate/issues/598), [#600](https://github.com/tidyverse/lubridate/issues/600), [#602](https://github.com/tidyverse/lubridate/issues/602) Fix zoneinfo lookup on windows and solaris.
 * [#598](https://github.com/tidyverse/lubridate/issues/598) Fix broken parsing of `ymd_hms` strings by `as_date`.