diff --git a/scripts/test-sources.sh b/scripts/test-sources.sh
index d4deb85..547ade9 100755
--- a/scripts/test-sources.sh
+++ b/scripts/test-sources.sh
@@ -19,7 +19,7 @@ NETWORK="goyomi_goyomi_dev"
 FLARESOLVERR_SERVICE="goyomi-flaresolverr-1"
 COMPOSE_FILE="$REPO_ROOT/compose.yml"
 GO_IMAGE="golang:1.26"
-PARALLELISM="${PARALLELISM:-4}"
+PARALLELISM="${PARALLELISM:-1}"
 PKG_TIMEOUT="${PKG_TIMEOUT:-120s}"
 LOGS_DIR="$REPO_ROOT/internal/sourcetest/logs"
 RUN_TIMESTAMP="$(date '+%Y-%m-%dT%H-%M-%S')"