diff --git a/extra/tzdata/checksums b/extra/tzdata/checksums
index 0df08a7a..50ac26f6 100644
--- a/extra/tzdata/checksums
+++ b/extra/tzdata/checksums
@@ -1 +1 @@
-72d056962f4aa3e543e700ea7717ea3872f34433606c00d39bfb1467c365eb01
+6b9ec90e79593913f687e3af5d880eaa036bb0aafea9707682b0cbd00fadbb09
diff --git a/extra/tzdata/sources b/extra/tzdata/sources
index 25b2204d..8f0c64af 100644
--- a/extra/tzdata/sources
+++ b/extra/tzdata/sources
@@ -1 +1 @@
-https://github.com/eggert/tz/archive/2020c.tar.gz
+https://github.com/eggert/tz/archive/2020d.tar.gz
diff --git a/extra/tzdata/version b/extra/tzdata/version
index 86e8583a..7979366b 100644
--- a/extra/tzdata/version
+++ b/extra/tzdata/version
@@ -1 +1 @@
-2020c 1
+2020d 1