diff --git a/.github/scripts/muffet.sh b/.github/scripts/muffet.sh
index bfbfc748b..4ee084728 100755
--- a/.github/scripts/muffet.sh
+++ b/.github/scripts/muffet.sh
@@ -17,7 +17,6 @@
 muffet http://localhost:1313 \
   --buffer-size 50000 \
   --timeout 35 \
-  --concurrency 2 \
   --ignore-fragments \
   --exclude ".*demo\.app\.medicmobile\.org.*" \
   --exclude ".*download\.docker\.com.*" \