diff --git a/CMakeLists.txt b/CMakeLists.txt
index d032550..8be1d12 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -200,7 +200,7 @@ add_dependency_project_package(zlib 1.2.11)
 
 ExternalProject_Add(xz
     DOWNLOAD_DIR ${CMAKE_SOURCE_DIR}/downloads
-    URL https://netix.dl.sourceforge.net/project/lzmautils/xz-5.2.4.tar.gz
+    URL https://netcologne.dl.sourceforge.net/project/lzmautils/xz-5.2.4.tar.gz
     URL_HASH SHA256=b512f3b726d3b37b6dc4c8570e137b9311e7552e8ccbab4d39d47ce5f4177145
     PATCH_COMMAND ${PATCH} -p1 -i ${CMAKE_SOURCE_DIR}/patches/$(TargetName).diff
     CMAKE_ARGS
@@ -410,7 +410,7 @@ endif()
 ExternalProject_Add(libass
     DEPENDS freetype libfribidi libiconv harfbuzz
     GIT_REPOSITORY https://github.com/xbmc/libass
-    GIT_TAG 3f188ca5bbcb6605c59dfa5731c01cd1273a6d6a
+    GIT_TAG 30091eeb035a9c28b1f2049a3c99448f8bfe83f0
     GIT_SHALLOW ON
     CMAKE_ARGS
         ${ADDITIONAL_ARGS}
@@ -418,7 +418,7 @@ ExternalProject_Add(libass
         -DCMAKE_PREFIX_PATH:PATH=${PREFIX}%3B%3B${PREFIX}/freetype%3B%3B${PREFIX}/libfribidi%3B%3B${PREFIX}/libiconv%3B%3B${PREFIX}/harfbuzz
         -DBUILD_SHARED_LIBS:BOOL=ON
 )
-add_dependency_project_package(libass 0.17.1)
+add_dependency_project_package(libass 0.17.3)
 
 ExternalProject_Add(brotli
     GIT_REPOSITORY https://github.com/Paxxi/brotli