diff --git a/.github/workflows/_sandbox.yaml b/.github/workflows/_sandbox.yaml
index 17ade19ad..2735183d8 100644
--- a/.github/workflows/_sandbox.yaml
+++ b/.github/workflows/_sandbox.yaml
@@ -1,5 +1,5 @@
 name: Sandbox
-run-name: CI-${{ inputs.ARCHITECTURE }}
+run-name: CI-amd64
 on:
   pull_request:
     types:
@@ -19,19 +19,19 @@ jobs:
   build-base:
     uses: ./.github/workflows/_build_base.yaml
     with:
-      ARCHITECTURE: ${{ inputs.ARCHITECTURE }}
-      BUILD_DATE: ${{ inputs.BUILD_DATE }}
-      MANIFEST_ARTIFACT_NAME: ${{ inputs.MANIFEST_ARTIFACT_NAME }}
+      ARCHITECTURE: amd64
+      BUILD_DATE: 20240418
+      MANIFEST_ARTIFACT_NAME: ""
     secrets: inherit
 
   build-jax:
     needs: build-base
     uses: ./.github/workflows/_build.yaml
     with:
-      ARCHITECTURE: ${{ inputs.ARCHITECTURE }}
+      ARCHITECTURE: amd64
       ARTIFACT_NAME: artifact-jax-build
       BADGE_FILENAME: badge-jax-build
-      BUILD_DATE: ${{ inputs.BUILD_DATE }}
+      BUILD_DATE: 20240418
       BASE_IMAGE: ${{ needs.build-base.outputs.DOCKER_TAG }}
       CONTAINER_NAME: jax
       DOCKERFILE: .github/container/Dockerfile.jax
@@ -43,10 +43,10 @@ jobs:
     if: inputs.ARCHITECTURE == 'amd64' # Triton does not seem to support arm64
     uses: ./.github/workflows/_build.yaml
     with:
-      ARCHITECTURE: ${{ inputs.ARCHITECTURE }}
+      ARCHITECTURE: amd64
       ARTIFACT_NAME: artifact-maxtext-build
       BADGE_FILENAME: badge-maxtext-build
-      BUILD_DATE: ${{ inputs.BUILD_DATE }}
+      BUILD_DATE: 20240418
       BASE_IMAGE: ${{ needs.build-jax.outputs.DOCKER_TAG_MEALKIT }}
       CONTAINER_NAME: maxtext
       DOCKERFILE: .github/container/Dockerfile.maxtext.amd64