diff --git a/extra/tzdata/checksums b/extra/tzdata/checksums
index dbdca45e..6ab69b1e 100644
--- a/extra/tzdata/checksums
+++ b/extra/tzdata/checksums
@@ -1 +1 @@
-38b1f7c7a050daa14fb07f6b72cdde1fc895fece40758d4d55736847041ad9e2  2019c.tar.gz
+9d41f0789dfaa9f6793f25d483888e41871d40291e8369ee991496b49194b533  2020a.tar.gz
diff --git a/extra/tzdata/sources b/extra/tzdata/sources
index f809f894..656ba47f 100644
--- a/extra/tzdata/sources
+++ b/extra/tzdata/sources
@@ -1 +1 @@
-https://github.com/eggert/tz/archive/2019c.tar.gz
+https://github.com/eggert/tz/archive/2020a.tar.gz
diff --git a/extra/tzdata/version b/extra/tzdata/version
index 6e4135ec..68b935fe 100644
--- a/extra/tzdata/version
+++ b/extra/tzdata/version
@@ -1 +1 @@
-2019c 1
+2020a 1