diff --git a/gradle.properties b/gradle.properties
index ac136ccf0..5322c3c18 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -5,7 +5,7 @@ group=org.jetbrains.kotlinx
 version=0.6.2
 versionSuffix=SNAPSHOT
 
-tzdbVersion=2025a
+tzdbVersion=2025b
 
 defaultKotlinVersion=2.1.0
 dokkaVersion=1.9.20
diff --git a/timezones/full/tzdb/America/Coyhaique b/timezones/full/tzdb/America/Coyhaique
new file mode 100644
index 000000000..ec17cd469
Binary files /dev/null and b/timezones/full/tzdb/America/Coyhaique differ
diff --git a/timezones/full/tzdb/Asia/Tehran b/timezones/full/tzdb/Asia/Tehran
index 3647d5759..d84c76703 100644
Binary files a/timezones/full/tzdb/Asia/Tehran and b/timezones/full/tzdb/Asia/Tehran differ
diff --git a/timezones/full/tzdb/Iran b/timezones/full/tzdb/Iran
index 3647d5759..d84c76703 100644
Binary files a/timezones/full/tzdb/Iran and b/timezones/full/tzdb/Iran differ