diff --git a/tests.sh b/tests.sh
index c8da2de958d0fd35dc2300e6819beafd9c52dd07..6cb6a24f49c6395b565d6780221723bd3d4d17b2 100644
--- a/tests.sh
+++ b/tests.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 set -ex
 
-sudo apt-get upgrade cmake -y
+sudo apt-get install --only-upgrade cmake -y
 mkdir -p build
 cd build
 cmake ..