diff --git a/Meta/CMake/time_zone_data.cmake b/Meta/CMake/time_zone_data.cmake
index 88de7be9176..1cb34e859bd 100644
--- a/Meta/CMake/time_zone_data.cmake
+++ b/Meta/CMake/time_zone_data.cmake
@@ -1,8 +1,9 @@
 include(${CMAKE_CURRENT_LIST_DIR}/utils.cmake)
 
-set(TZDB_PATH "${SERENITY_CACHE_DIR}/TZDB" CACHE PATH "Download location for TZDB files")
+set(TZDB_VERSION "2024a")
+set(TZDB_SHA256 "0d0434459acbd2059a7a8da1f3304a84a86591f6ed69c6248fffa502b6edffe3")
 
-set(TZDB_VERSION 2024a)
+set(TZDB_PATH "${SERENITY_CACHE_DIR}/TZDB" CACHE PATH "Download location for TZDB files")
 set(TZDB_VERSION_FILE "${TZDB_PATH}/version.txt")
 
 set(TZDB_ZIP_URL "https://data.iana.org/time-zones/releases/tzdata${TZDB_VERSION}.tar.gz")
@@ -46,7 +47,7 @@ if (ENABLE_TIME_ZONE_DATABASE_DOWNLOAD)
     remove_path_if_version_changed("${TZDB_VERSION}" "${TZDB_VERSION_FILE}" "${TZDB_PATH}")
 
     if (ENABLE_NETWORK_DOWNLOADS)
-        download_file("${TZDB_ZIP_URL}" "${TZDB_ZIP_PATH}")
+        download_file("${TZDB_ZIP_URL}" "${TZDB_ZIP_PATH}" SHA256 "${TZDB_SHA256}")
         extract_tzdb_file("${TZDB_AFRICA_SOURCE}" "${TZDB_AFRICA_PATH}")
         extract_tzdb_file("${TZDB_ANTARCTICA_SOURCE}" "${TZDB_ANTARCTICA_PATH}")
         extract_tzdb_file("${TZDB_ASIA_SOURCE}" "${TZDB_ASIA_PATH}")
diff --git a/Meta/gn/secondary/Userland/Libraries/LibTimeZone/BUILD.gn b/Meta/gn/secondary/Userland/Libraries/LibTimeZone/BUILD.gn
index d3824e2d622..3c7c60d97bd 100644
--- a/Meta/gn/secondary/Userland/Libraries/LibTimeZone/BUILD.gn
+++ b/Meta/gn/secondary/Userland/Libraries/LibTimeZone/BUILD.gn
@@ -11,14 +11,16 @@ declare_args() {
 
 tzdb_cache = cache_path + "TZDB/"
 
+tzdb_version = "2024a"
+
 if (enable_timezone_database_download) {
   download_file("timezone_database_download") {
-    version = "2024a"
-    url =
-        "https://data.iana.org/time-zones/releases/tzdata" + version + ".tar.gz"
+    version = tzdb_version
+    url = "https://data.iana.org/time-zones/releases/tzdata$version.tar.gz"
     cache = tzdb_cache
     output = "tzdb.tar.gz"
     version_file = "version.txt"
+    sha256 = "0d0434459acbd2059a7a8da1f3304a84a86591f6ed69c6248fffa502b6edffe3"
   }
   extract_archive_contents("timezone_database_files") {
     deps = [ ":timezone_database_download" ]