diff --git a/Scripts/update.sh b/Scripts/update.sh
index 1eca56f..e2d9b56 100755
--- a/Scripts/update.sh
+++ b/Scripts/update.sh
@@ -3,7 +3,7 @@
 LATEST_VERSION=$(gh api repos/SteamRE/DepotDownloader/releases/latest | jq -r ".name" | sed 's/DepotDownloader[_ ]//')
 CURRENT_VERSION=$(grep 'version "' Casks/depotdownloader.rb | cut -d '"' -f 2)
 
-if [[ "$LATEST_VERSION" = "$CURRENT_VERSION" ]]
+if [[ "${LATEST_VERSION}" = "${CURRENT_VERSION}" ]]
 then
   echo "DepotDownloader Cask is up to date."
   exit 0
@@ -21,10 +21,10 @@ update_for_arch() {
   FILE_ARCH=$2
 
   FILE_SHA_256=$(curl -fSsL -o - "https://github.com/SteamRE/DepotDownloader/releases/download/DepotDownloader_${LATEST_VERSION}/DepotDownloader-macos-${FILE_ARCH}.zip" | shasum -a 256 | awk '{print $1}')
-  $SED_INLINE "s/${BREW_ARCH}:\([ \t]*\)\"[0-9a-f]*\"/${BREW_ARCH}:\1\"${FILE_SHA_256}\"/g" Casks/depotdownloader.rb
+  ${SED_INLINE} "s/${BREW_ARCH}:\([ \t]*\)\"[0-9a-f]*\"/${BREW_ARCH}:\1\"${FILE_SHA_256}\"/g" Casks/depotdownloader.rb
 }
 
-$SED_INLINE "s/version \"${CURRENT_VERSION}\"/version \"${LATEST_VERSION}\"/" Casks/depotdownloader.rb
+${SED_INLINE} "s/version \"${CURRENT_VERSION}\"/version \"${LATEST_VERSION}\"/" Casks/depotdownloader.rb
 update_for_arch arm arm64
 update_for_arch intel x64