diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index 8b5ab5bcdc..9ad64a59ed 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -453,7 +453,7 @@ if(PKG_VORONOI)
     set(VORO_BUILD_OPTIONS CXX=${CMAKE_CXX_COMPILER} CFLAGS=${VORO_BUILD_CFLAGS})
 
     ExternalProject_Add(voro_build
-      URL http://math.lbl.gov/voro++/download/dir/voro++-0.4.6.tar.gz
+      URL https://download.lammps.org/thirdparty/voro++-0.4.6.tar.gz
       URL_MD5 2338b824c3b7b25590e18e8df5d68af9
       CONFIGURE_COMMAND "" BUILD_COMMAND make ${VORO_BUILD_OPTIONS} BUILD_IN_SOURCE 1 INSTALL_COMMAND ""
       )
diff --git a/lib/voronoi/Install.py b/lib/voronoi/Install.py
index bbab40dc6b..6a95637720 100644
--- a/lib/voronoi/Install.py
+++ b/lib/voronoi/Install.py
@@ -18,7 +18,7 @@ parser = ArgumentParser(prog='Install.py',
 # settings
 
 version = "voro++-0.4.6"
-url = "http://math.lbl.gov/voro++/download/dir/%s.tar.gz" % version
+url = "https://download.lammps.org/thirdparty/%s.tar.gz" % version
 
 # known checksums for different Voro++ versions. used to validate the download.
 checksums = { \