diff --git a/.github/workflows/src/update-homebrew.sh b/.github/workflows/src/update-homebrew.sh
index 717dc976c..541cb2c6e 100644
--- a/.github/workflows/src/update-homebrew.sh
+++ b/.github/workflows/src/update-homebrew.sh
@@ -1,7 +1,7 @@
 latest_version="$(git describe --tags --abbrev=0)"
 sed -i "s/version(.*)/version('${latest_version}')/" ./Casks/zen-browser.rb
 
-sha_x64 = shasum -a 256 zen.macos-x64.dmg
-sha_arm = shasum -a 256 zen.macos-aarch64.dmg
+sha_x64=$(shasum -a 256 zen.macos-x64.dmg)
+sha_arm=$(shasum -a 256 zen.macos-aarch64.dmg)
 
 sed -i "s/sha256(.*)/sha256(arm:'${sha_arm}', intel:'${sha_x64}')/" ./Casks/zen-browser.rb