diff --git a/.github/workflows/nightly-spartan-bench.yml b/.github/workflows/nightly-spartan-bench.yml
index e331be8f8ec5..f30b36ff6ee6 100644
--- a/.github/workflows/nightly-spartan-bench.yml
+++ b/.github/workflows/nightly-spartan-bench.yml
@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
     inputs:
       nightly_tag:
-        description: "Nightly tag to use (e.g., 2.3.4-spartan.20251209). Leave empty to auto-detect."
+        description: "Nightly tag to use (e.g., 2.3.4-nightly.20251209). Leave empty to auto-detect."
         required: false
         type: string
 
@@ -21,7 +21,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
         with:
-          ref: merge-train/spartan
+          ref: next
 
       - name: Determine nightly tag
         id: nightly-tag
@@ -30,7 +30,7 @@ jobs:
             nightly_tag="${{ inputs.nightly_tag }}"
           else
             current_version=$(jq -r '."."' .release-please-manifest.json)
-            nightly_tag="${current_version}-spartan.$(date -u +%Y%m%d)"
+            nightly_tag="${current_version}-nightly.$(date -u +%Y%m%d)"
           fi
           echo "nightly_tag=$nightly_tag" >> $GITHUB_OUTPUT
           echo "Using nightly tag: $nightly_tag"
@@ -126,7 +126,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
         with:
-          ref: merge-train/spartan
+          ref: next
 
       - name: Determine nightly tag
         id: nightly-tag
@@ -135,7 +135,7 @@ jobs:
             nightly_tag="${{ inputs.nightly_tag }}"
           else
             current_version=$(jq -r '."."' .release-please-manifest.json)
-            nightly_tag="${current_version}-spartan.$(date -u +%Y%m%d)"
+            nightly_tag="${current_version}-nightly.$(date -u +%Y%m%d)"
           fi
           echo "nightly_tag=$nightly_tag" >> $GITHUB_OUTPUT
           echo "Using nightly tag: $nightly_tag"
diff --git a/.github/workflows/weekly-proving-bench.yml b/.github/workflows/weekly-proving-bench.yml
index f9f561f6d88e..bd066b47df88 100644
--- a/.github/workflows/weekly-proving-bench.yml
+++ b/.github/workflows/weekly-proving-bench.yml
@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
     inputs:
       nightly_tag:
-        description: "Nightly tag to use (e.g., 2.3.4-spartan.20251209). Leave empty to auto-detect."
+        description: "Nightly tag to use (e.g., 2.3.4-nightly.20251209). Leave empty to auto-detect."
         required: false
         type: string
 
@@ -21,7 +21,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
         with:
-          ref: merge-train/spartan
+          ref: next
 
       - name: Determine nightly tag
         id: nightly-tag
@@ -30,7 +30,7 @@ jobs:
             nightly_tag="${{ inputs.nightly_tag }}"
           else
             current_version=$(jq -r '."."' .release-please-manifest.json)
-            nightly_tag="${current_version}-spartan.$(date -u +%Y%m%d)"
+            nightly_tag="${current_version}-nightly.$(date -u +%Y%m%d)"
           fi
           echo "nightly_tag=$nightly_tag" >> $GITHUB_OUTPUT
           echo "Using nightly tag: $nightly_tag"