diff --git a/extra/tzdata/checksums b/extra/tzdata/checksums
index b523098b..80eb74be 100644
--- a/extra/tzdata/checksums
+++ b/extra/tzdata/checksums
@@ -1 +1 @@
-7bf31cf0434384ff754c5020d4e7eb2d449aebbe0a3c228556b3cef81395d1e359
+6a1d7b6875313a98136bbf081617c89bdcc16ca41ce093f188a0b53cdde76b86f2
diff --git a/extra/tzdata/sources b/extra/tzdata/sources
index b8dd1aaa..1a4847ad 100644
--- a/extra/tzdata/sources
+++ b/extra/tzdata/sources
@@ -1 +1 @@
-https://github.com/eggert/tz/archive/2023a.tar.gz
+https://github.com/eggert/tz/archive/2023b.tar.gz
diff --git a/extra/tzdata/version b/extra/tzdata/version
index 39673b89..ef93f4db 100644
--- a/extra/tzdata/version
+++ b/extra/tzdata/version
@@ -1 +1 @@
-2023a 1
+2023b 1