diff --git a/lib/time/update.bash b/lib/time/update.bash
index 6261f81dcd..16552fb6f9 100755
--- a/lib/time/update.bash
+++ b/lib/time/update.bash
@@ -8,8 +8,8 @@
 # Consult http://www.iana.org/time-zones for the latest versions.
 
 # Versions to use.
-CODE=2017b
-DATA=2017b
+CODE=2017c
+DATA=2017c
 
 set -e
 rm -rf work
diff --git a/lib/time/zoneinfo.zip b/lib/time/zoneinfo.zip
index b60ae7f98e..0703e08e36 100644
Binary files a/lib/time/zoneinfo.zip and b/lib/time/zoneinfo.zip differ