diff --git a/src/tzfile.h b/src/tzfile.h
index 21ae37c..3155010 100644
--- a/src/tzfile.h
+++ b/src/tzfile.h
@@ -78,11 +78,11 @@ struct tzhead {
 ** time uses 8 rather than 4 chars,
 ** then a POSIX-TZ-environment-variable-style string for use in handling
 ** instants after the last transition time stored in the file
-** (with nothing between the newlines if there is no POSIX representation for
-** such instants).
+** (with nothing between the newlines if there is no POSIX.1-2017
+** representation for such instants).
 **
 ** If tz_version is '3' or greater, the above is extended as follows.
-** First, the POSIX TZ string's hour offset may range from -167
+** First, the TZ string's hour offset may range from -167
 ** through 167 as compared to the POSIX-required 0 through 24.
 ** Second, its DST start time may be January 1 at 00:00 and its stop
 ** time December 31 at 24:00 plus the difference between DST and
diff --git a/testdata/version b/testdata/version
index cd9c3f6..04fe674 100644
--- a/testdata/version
+++ b/testdata/version
@@ -1 +1 @@
-2023d
+2024a
diff --git a/testdata/zoneinfo/America/Miquelon b/testdata/zoneinfo/America/Miquelon
index 3b62585..ba95cb0 100644
Binary files a/testdata/zoneinfo/America/Miquelon and b/testdata/zoneinfo/America/Miquelon differ
diff --git a/testdata/zoneinfo/America/Montreal b/testdata/zoneinfo/America/Montreal
index fe6be8e..668e70d 100644
Binary files a/testdata/zoneinfo/America/Montreal and b/testdata/zoneinfo/America/Montreal differ
diff --git a/testdata/zoneinfo/America/Nipigon b/testdata/zoneinfo/America/Nipigon
index fe6be8e..668e70d 100644
Binary files a/testdata/zoneinfo/America/Nipigon and b/testdata/zoneinfo/America/Nipigon differ
diff --git a/testdata/zoneinfo/America/Thunder_Bay b/testdata/zoneinfo/America/Thunder_Bay
index fe6be8e..668e70d 100644
Binary files a/testdata/zoneinfo/America/Thunder_Bay and b/testdata/zoneinfo/America/Thunder_Bay differ
diff --git a/testdata/zoneinfo/America/Toronto b/testdata/zoneinfo/America/Toronto
index fe6be8e..668e70d 100644
Binary files a/testdata/zoneinfo/America/Toronto and b/testdata/zoneinfo/America/Toronto differ
diff --git a/testdata/zoneinfo/Asia/Almaty b/testdata/zoneinfo/Asia/Almaty
index 3ec4fc8..02f047d 100644
Binary files a/testdata/zoneinfo/Asia/Almaty and b/testdata/zoneinfo/Asia/Almaty differ
diff --git a/testdata/zoneinfo/Asia/Gaza b/testdata/zoneinfo/Asia/Gaza
index 6241b4e..0d79662 100644
Binary files a/testdata/zoneinfo/Asia/Gaza and b/testdata/zoneinfo/Asia/Gaza differ
diff --git a/testdata/zoneinfo/Asia/Hebron b/testdata/zoneinfo/Asia/Hebron
index 5267de9..53a3c14 100644
Binary files a/testdata/zoneinfo/Asia/Hebron and b/testdata/zoneinfo/Asia/Hebron differ
diff --git a/testdata/zoneinfo/Asia/Ho_Chi_Minh b/testdata/zoneinfo/Asia/Ho_Chi_Minh
index de53596..86e21b0 100644
Binary files a/testdata/zoneinfo/Asia/Ho_Chi_Minh and b/testdata/zoneinfo/Asia/Ho_Chi_Minh differ
diff --git a/testdata/zoneinfo/Asia/Qostanay b/testdata/zoneinfo/Asia/Qostanay
index ff6fe61..109fe41 100644
Binary files a/testdata/zoneinfo/Asia/Qostanay and b/testdata/zoneinfo/Asia/Qostanay differ
diff --git a/testdata/zoneinfo/Asia/Saigon b/testdata/zoneinfo/Asia/Saigon
index de53596..86e21b0 100644
Binary files a/testdata/zoneinfo/Asia/Saigon and b/testdata/zoneinfo/Asia/Saigon differ
diff --git a/testdata/zoneinfo/Canada/Eastern b/testdata/zoneinfo/Canada/Eastern
index fe6be8e..668e70d 100644
Binary files a/testdata/zoneinfo/Canada/Eastern and b/testdata/zoneinfo/Canada/Eastern differ
diff --git a/testdata/zoneinfo/zonenow.tab b/testdata/zoneinfo/zonenow.tab
index 2dbe8f0..b6f2910 100644
--- a/testdata/zoneinfo/zonenow.tab
+++ b/testdata/zoneinfo/zonenow.tab
@@ -199,7 +199,7 @@ XX	+2518+05518	Asia/Dubai	Russia; Caucasus; Persian Gulf; Seychelles; Réunion
 XX	+3431+06912	Asia/Kabul	Afghanistan
 #
 # +05
-XX	+4120+06918	Asia/Tashkent	Russia; Tajikistan; Turkmenistan; Uzbekistan; Maldives
+XX	+4120+06918	Asia/Tashkent	Russia; west Kazakhstan; Tajikistan; Turkmenistan; Uzbekistan; Maldives
 #
 # +05 - PKT
 XX	+2452+06703	Asia/Karachi	Pakistan ("PKT")
@@ -215,6 +215,8 @@ XX	+2743+08519	Asia/Kathmandu	Nepal
 #
 # +06
 XX	+2343+09025	Asia/Dhaka	Russia; Kyrgyzstan; Bhutan; Bangladesh; Chagos
+# +06 until 2024-03-01; then +05
+XX	+4315+07657	Asia/Almaty	Kazakhstan (except western areas)
 #
 # +06:30
 XX	+1647+09610	Asia/Yangon	Myanmar; Cocos