diff --git a/.github/workflows/finalize-release.yml b/.github/workflows/finalize-release.yml
index f1c5bef..cbe0d3d 100644
--- a/.github/workflows/finalize-release.yml
+++ b/.github/workflows/finalize-release.yml
@@ -49,6 +49,7 @@ jobs:
           EXPECTED_ARCH: ${{ matrix.arch }}
         run: |
           set -euo pipefail
+          export HOMEBREW_NO_COLOR=1
           test "$(uname -m)" = "$EXPECTED_ARCH"
           brew tap DevVig/microbridge https://github.com/DevVig/microbridge
           brew update
diff --git a/scripts/smoke-formula.sh b/scripts/smoke-formula.sh
index b174a8e..79940c5 100755
--- a/scripts/smoke-formula.sh
+++ b/scripts/smoke-formula.sh
@@ -3,6 +3,7 @@
 # package lifecycle. The caller supplies a local formula, expected version, and
 # expected machine architecture.
 set -euo pipefail
+export HOMEBREW_NO_COLOR=1
 
 FORMULA="${1:?usage: $0 path/to/microbridge.rb VERSION ARCH}"
 VERSION="${2:?usage: $0 path/to/microbridge.rb VERSION ARCH}"