diff --git a/scripts/make-sfx.sh b/scripts/make-sfx.sh
index eeda132c..51725d07 100755
--- a/scripts/make-sfx.sh
+++ b/scripts/make-sfx.sh
@@ -115,7 +115,7 @@ git describe --tags >/dev/null 2>/dev/null && {
 		exit 1
 	}
 
-	dt="$(git log -1 --format=%cd --date=format:'%Y,%m,%d' | sed 's/,0?/, /g')"
+	dt="$(git log -1 --format=%cd --date=format:'%Y,%m,%d' | sed -E 's/,0?/, /g')"
 	printf 'git %3s: \033[36m%s\033[0m\n' ver "$ver" dt "$dt"
 	sed -ri '
 		s/^(VERSION =)(.*)/#\1\2\n\1 ('"$t_ver"')/;
diff --git a/scripts/make-tgz-release.sh b/scripts/make-tgz-release.sh
index 85ff7483..f3c34a18 100755
--- a/scripts/make-tgz-release.sh
+++ b/scripts/make-tgz-release.sh
@@ -16,15 +16,15 @@ which md5sum 2>/dev/null >/dev/null &&
 
 ver="$1"
 
-[[ "x$ver" == x ]] &&
+[ "x$ver" = x ] &&
 {
 	echo "need argument 1:  version"
 	echo
 	exit 1
 }
 
-[[ -e copyparty/__main__.py ]] || cd ..
-[[ -e copyparty/__main__.py ]] ||
+[ -e copyparty/__main__.py ] || cd ..
+[ -e copyparty/__main__.py ] ||
 {
 	echo "run me from within the project root folder"
 	echo
@@ -35,8 +35,8 @@ mkdir -p dist
 zip_path="$(pwd)/dist/copyparty-$ver.zip"
 tgz_path="$(pwd)/dist/copyparty-$ver.tar.gz"
 
-[[ -e "$zip_path" ]] ||
-[[ -e "$tgz_path" ]] &&
+[ -e "$zip_path" ] ||
+[ -e "$tgz_path" ] &&
 {
 	echo "found existing archives for this version"
 	echo "  $zip_path"