diff --git a/.github/workflows/sorbet.yml b/.github/workflows/sorbet.yml
index c6b7d49d3b..962d3d0e1e 100644
--- a/.github/workflows/sorbet.yml
+++ b/.github/workflows/sorbet.yml
@@ -32,7 +32,7 @@ jobs:
       - name: Update RBI files
         id: update
         env:
-          GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}
+          HOMEBREW_GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}
         run: |
           git fetch origin
 
diff --git a/.github/workflows/spdx.yml b/.github/workflows/spdx.yml
index 3ec800e799..2845cf45a1 100644
--- a/.github/workflows/spdx.yml
+++ b/.github/workflows/spdx.yml
@@ -31,7 +31,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           HOMEBREW_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}
+          HOMEBREW_GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}
         run: |
           git fetch origin
 
diff --git a/.github/workflows/update-manpage.yml b/.github/workflows/update-manpage.yml
index d43619b7d8..82a0efafbb 100644
--- a/.github/workflows/update-manpage.yml
+++ b/.github/workflows/update-manpage.yml
@@ -70,7 +70,7 @@ jobs:
           fi
         env:
           HOMEBREW_GITHUB_API_TOKEN: ${{ secrets.HOMEBREW_GITHUB_API_TOKEN }}
-          GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}
+          HOMEBREW_GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}
 
       - name: Push commits
         if: steps.update.outputs.committed == 'true'
diff --git a/.github/workflows/vendor-gems.yml b/.github/workflows/vendor-gems.yml
index 6a3e475bdb..a3db4f0e1f 100644
--- a/.github/workflows/vendor-gems.yml
+++ b/.github/workflows/vendor-gems.yml
@@ -47,7 +47,7 @@ jobs:
       - name: Vendor Gems
         env:
           GEM_NAME: ${{ steps.checkout.outputs.gem_name }}
-          GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}
+          HOMEBREW_GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}
         run: |
           set -u
 
@@ -59,7 +59,7 @@ jobs:
       - name: Update RBI files
         env:
           GEM_NAME: ${{ steps.checkout.outputs.gem_name }}
-          GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}
+          HOMEBREW_GPG_PASSPHRASE: ${{ secrets.BREWTESTBOT_GPG_SIGNING_SUBKEY_PASSPHRASE }}
         run: |
           set -u