diff --git a/update.sh b/update.sh
index 96c3a9f0..9965de5c 100755
--- a/update.sh
+++ b/update.sh
@@ -4,7 +4,7 @@
 set -Eeuo pipefail
 shopt -s nullglob
 
-cd "$(dirname "$(greadlink -f "$BASH_SOURCE")")"
+cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"
 
 declare branches=(
     "stable"
@@ -184,7 +184,7 @@ for branch in "${branches[@]}"; do
         packagever=$(get_packagever "$variant" "$branch")
         buildtarget=$(get_buildtarget "$variant")
 
-        gsed -i.bak \
+        sed -i.bak \
             -e 's,%%ALPINE_VERSION%%,'"$alpinever"',' \
             -e 's,%%DEBIAN_VERSION%%,'"$debianver"',' \
             -e 's,%%NGINX_VERSION%%,'"$nginxver"',' \