diff --git a/extra/tzdata/checksums b/extra/tzdata/checksums
index 50ac26f6..b262b413 100644
--- a/extra/tzdata/checksums
+++ b/extra/tzdata/checksums
@@ -1 +1 @@
-6b9ec90e79593913f687e3af5d880eaa036bb0aafea9707682b0cbd00fadbb09
+bd7ecd99cbb0a2f15bb7e38be2cbc04dced89922fce4ac0ffcd1ca844ba9362f
diff --git a/extra/tzdata/sources b/extra/tzdata/sources
index 8f0c64af..2421adff 100644
--- a/extra/tzdata/sources
+++ b/extra/tzdata/sources
@@ -1 +1 @@
-https://github.com/eggert/tz/archive/2020d.tar.gz
+https://github.com/eggert/tz/archive/2021a.tar.gz
diff --git a/extra/tzdata/version b/extra/tzdata/version
index 7979366b..2221e5ba 100644
--- a/extra/tzdata/version
+++ b/extra/tzdata/version
@@ -1 +1 @@
-2020d 1
+2021a 1