diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 559000d19..545e09bc6 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -114,11 +114,11 @@ jobs:
 
           # install exactly these versions of tar and the libraries, other combinations might not work!
 
-          Invoke-WebRequest https://sourceforge.netcologne.de/project/gnuwin32/tar/1.13-1/tar-1.13-1-bin.zip -OutFile tar.zip
+          Invoke-WebRequest https://github.com/restic/test-assets/raw/master/tar-1.13-1-bin.zip -OutFile tar.zip
           unzip tar.zip
-          Invoke-WebRequest https://master.dl.sourceforge.net/project/gnuwin32/libintl/0.11.5-2/libintl-0.11.5-2-bin.zip -OutFile libintl.zip
+          Invoke-WebRequest https://github.com/restic/test-assets/raw/master/libintl-0.11.5-2-bin.zip -OutFile libintl.zip
           unzip libintl.zip
-          Invoke-WebRequest https://master.dl.sourceforge.net/project/gnuwin32/libiconv/1.8-1/libiconv-1.8-1-bin.zip -OutFile libiconv.zip
+          Invoke-WebRequest https://github.com/restic/test-assets/raw/master/libiconv-1.8-1-bin.zip -OutFile libiconv.zip
           unzip libiconv.zip
 
           # add $USERPROFILE/tar/bin to path