diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 213883b22d2..37253370022 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -683,6 +683,12 @@ jobs:
       # allowed in official Homebrew taps. Remove it so the formula can be installed from
       # this local dev tap. It must remain in the released formula, so we only strip it here.
       sed -i '' '/no_autobump!/d' $(brew --repository)/Library/Taps/dev/homebrew-azure-cli/Formula/azure-cli.rb
+      # TODO(packaging): remove once the macOS CI agent image's Homebrew provides formula_opt_prefix.
+      # The upstream homebrew-core formula calls `formula_opt_prefix("openssl@3")`, a newer
+      # Homebrew DSL helper not available on the older Homebrew on the macOS CI agent image
+      # (NoMethodError). Rewrite it to the backward-compatible `Formula["openssl@3"].opt_prefix`
+      # form for the local test install only; the generated/submitted formula stays upstream-faithful.
+      sed -E -i '' 's/formula_opt_prefix\(?[[:space:]]*"([^"]+)"[[:space:]]*\)?/Formula["\1"].opt_prefix/g' $(brew --repository)/Library/Taps/dev/homebrew-azure-cli/Formula/azure-cli.rb
       brew install --build-from-source dev/homebrew-azure-cli/azure-cli
       
       echo == Az Version ==
diff --git a/scripts/release/homebrew/test_homebrew_package.sh b/scripts/release/homebrew/test_homebrew_package.sh
index f55d9ab5074..c0471691cef 100755
--- a/scripts/release/homebrew/test_homebrew_package.sh
+++ b/scripts/release/homebrew/test_homebrew_package.sh
@@ -8,6 +8,12 @@ echo == Remove pre-installed azure-cli ==
 brew uninstall azure-cli
 
 echo == Install azure-cli.rb formula ==
+# TODO(packaging): remove once the macOS CI agent image's Homebrew provides formula_opt_prefix.
+# The upstream homebrew-core formula calls `formula_opt_prefix("openssl@3")`, a newer
+# Homebrew DSL helper not available on the older Homebrew on the macOS CI agent image
+# (NoMethodError). Rewrite it to the backward-compatible `Formula["openssl@3"].opt_prefix`
+# form for the local test install only; the generated/submitted formula stays upstream-faithful.
+sed -E -i '' 's/formula_opt_prefix\(?[[:space:]]*"([^"]+)"[[:space:]]*\)?/Formula["\1"].opt_prefix/g' $SYSTEM_ARTIFACTSDIRECTORY/homebrew/azure-cli.rb
 brew install --build-from-source $SYSTEM_ARTIFACTSDIRECTORY/homebrew/azure-cli.rb
 
 AZ_BASE=/usr/local/Cellar/azure-cli/$CLI_VERSION/libexec