diff --git a/cmake_modules/ThirdpartyToolchain.cmake b/cmake_modules/ThirdpartyToolchain.cmake
index 1a28b1ae..74f0e61c 100644
--- a/cmake_modules/ThirdpartyToolchain.cmake
+++ b/cmake_modules/ThirdpartyToolchain.cmake
@@ -228,8 +228,8 @@ endif ()
 
 if (WIN32)
   ExternalProject_Add(tzdata_ep
-    URL "ftp://cygwin.osuosl.org/pub/cygwin/noarch/release/tzdata/tzdata-2018c-1.tar.xz"
-    URL_HASH MD5=F69FCA5C906FAFF02462D3D06F28267C
+    URL "ftp://cygwin.osuosl.org/pub/cygwin/noarch/release/tzdata/tzdata-2019b-1.tar.xz"
+    URL_HASH MD5=17D8AB346BB1009D4EB35BC08040E51D
     CONFIGURE_COMMAND ""
     BUILD_COMMAND ""
     INSTALL_COMMAND "")