diff --git a/extern/icu/tzdata/be.zip b/extern/icu/tzdata/be.zip
index 12692bba7c..6632977cac 100644
Binary files a/extern/icu/tzdata/be.zip and b/extern/icu/tzdata/be.zip differ
diff --git a/extern/icu/tzdata/le.zip b/extern/icu/tzdata/le.zip
index 47fda6035e..d10fcddfc2 100644
Binary files a/extern/icu/tzdata/le.zip and b/extern/icu/tzdata/le.zip differ
diff --git a/extern/icu/tzdata/version.txt b/extern/icu/tzdata/version.txt
index 366745ce82..dac017a1e4 100644
--- a/extern/icu/tzdata/version.txt
+++ b/extern/icu/tzdata/version.txt
@@ -1 +1 @@
-2021a3
+2021a4
diff --git a/src/common/TimeZones.h b/src/common/TimeZones.h
index 4262ec0bda..e7d4353b83 100644
--- a/src/common/TimeZones.h
+++ b/src/common/TimeZones.h
@@ -1,6 +1,6 @@
 // The content of this file is generated with help of update-ids utility Do not edit.
 
-static const char* BUILTIN_TIME_ZONE_VERSION = "2021a3";
+static const char* BUILTIN_TIME_ZONE_VERSION = "2021a4";
 
 // Do not change order of items in this array! The index corresponds to a TimeZone ID, which must be fixed!
 static const char* BUILTIN_TIME_ZONE_LIST[] = {