diff --git a/download_test_vectors.sh b/download_test_vectors.sh
index 0a33c0e..78dca04 100755
--- a/download_test_vectors.sh
+++ b/download_test_vectors.sh
@@ -47,24 +47,31 @@ unpack_version() {
 	[[ -z "$1" ]] && { echo "usage: unpack_version() vX.Y.Z"; exit 1; }
 	version="$1"
 
-	dl_version "$version"
+	local retries=0 ok=0
+	while (( !ok && ++retries <= 5 )); do  # downloaded tar.gz may be corrupted
+		dl_version "$version"
 
-	# suppress warnings when unpacking with GNU tar an archive created with BSD tar (probably on macOS)
-	EXTRA_TAR_PARAMS=""
-	tar --version | grep -qi 'gnu' && EXTRA_TAR_PARAMS="--warning=no-unknown-keyword --ignore-zeros"
+		# suppress warnings when unpacking with GNU tar an archive created with BSD tar (probably on macOS)
+		EXTRA_TAR_PARAMS=""
+		tar --version | grep -qi 'gnu' && EXTRA_TAR_PARAMS="--warning=no-unknown-keyword --ignore-zeros"
 
-	if [[ ! -d "tests-${version}" ]]; then
-		for flavour in "${FLAVOURS[@]}"; do
-			echo "Unpacking: ${version}/${flavour}.tar.gz"
-			mkdir -p "tests-${version}"
-			tar -C "tests-${version}" --strip-components 1 ${EXTRA_TAR_PARAMS} --exclude=phase1 -xzf \
-				"tarballs/${version}/${flavour}.tar.gz" \
-				|| {
-					echo "Tar failed. Aborting."
-					rm -rf "tests-${version}"
-					exit 1
-				}
-		done
+		ok=1
+		if [[ ! -d "tests-${version}" ]]; then
+			for flavour in "${FLAVOURS[@]}"; do
+				echo "Unpacking: ${version}/${flavour}.tar.gz"
+				mkdir -p "tests-${version}"
+				tar -C "tests-${version}" --strip-components 1 ${EXTRA_TAR_PARAMS} --exclude=phase1 -xzf \
+					"tarballs/${version}/${flavour}.tar.gz" \
+					|| {
+						rm -rf "tests-${version}" "tarballs/${version}/${flavour}.tar.gz"
+						ok=0
+					}
+			done
+		fi
+	done
+	if (( !ok )); then
+		echo "Unpacking test vectors failed too often. Aborting."
+		exit 1
 	fi
 }