diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 19d2e86..1d90d6f 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -16,8 +16,6 @@ concurrency:
   group: deploy-production
   cancel-in-progress: false
 
-env:
-  IMAGE: ghcr.io/${{ github.repository }}
 
 jobs:
   deploy:
@@ -37,6 +35,8 @@ jobs:
         id: meta
         run: |
           echo "sha=$(git rev-parse --short HEAD)" >> "$GITHUB_OUTPUT"
+          # Registry names must be lowercase; the repo owner is not.
+          echo "image=ghcr.io/$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> "$GITHUB_OUTPUT"
           echo "Deploying $(git rev-parse --short HEAD) — $(git log -1 --pretty=%s)"
 
       # Deploy only what passes. Actions does not gate workflow_dispatch on
@@ -67,8 +67,8 @@ jobs:
           platforms: linux/amd64
           push: true
           tags: |
-            ${{ env.IMAGE }}:${{ steps.meta.outputs.sha }}
-            ${{ env.IMAGE }}:latest
+            ${{ steps.meta.outputs.image }}:${{ steps.meta.outputs.sha }}
+            ${{ steps.meta.outputs.image }}:latest
           cache-from: type=gha
           cache-to: type=gha,mode=max
 
@@ -87,7 +87,7 @@ jobs:
           TAG: ${{ steps.meta.outputs.sha }}
         run: |
           ssh -o BatchMode=yes "${{ secrets.DEPLOY_USER }}@${{ secrets.DEPLOY_HOST }}" \
-            "IMAGE='${{ env.IMAGE }}' TAG='$TAG' bash -s" <<'REMOTE'
+            "IMAGE='${{ steps.meta.outputs.image }}' TAG='$TAG' bash -s" <<'REMOTE'
           set -euo pipefail
           cd /opt/hookdrop
 
@@ -147,7 +147,7 @@ jobs:
             echo "### Deploy ${{ job.status }}"
             echo ""
             echo "- ref: \`${{ inputs.ref }}\`"
-            echo "- image: \`${{ env.IMAGE }}:${{ steps.meta.outputs.sha }}\`"
+            echo "- image: \`${{ steps.meta.outputs.image }}:${{ steps.meta.outputs.sha }}\`"
             echo ""
             echo "Roll back by re-running this workflow against the previous commit."
           } >> "$GITHUB_STEP_SUMMARY"