diff --git a/.github/workflows/_pr-test-stage.yml b/.github/workflows/_pr-test-stage.yml
index c29402e0b..ae4165c75 100644
--- a/.github/workflows/_pr-test-stage.yml
+++ b/.github/workflows/_pr-test-stage.yml
@@ -100,14 +100,12 @@ jobs:
   run:
     name: ${{ inputs.self_name }} (${{ matrix.partition }})
     # Runs on schedule / parallel-dispatch / non-failed PR with main_package or sgl_kernel changes.
-    # Temporarily skip the broken GB300 runner before GitHub tries to allocate it.
     # `runner_filter` is matched here rather than in each caller's job `if`: a
     # caller that declares its runners as a matrix cannot, since job-level `if`
     # sees github/needs/vars/inputs but not `matrix`. Callers that never declare
     # the input read back null and match every runner_config.
     if: |
       always() &&
-      inputs.runner_config != '4-gpu-gb300' &&
       (fromJson(inputs.caller_inputs).runner_filter == null ||
        fromJson(inputs.caller_inputs).runner_filter == '' ||
        fromJson(inputs.caller_inputs).runner_filter == 'all' ||
diff --git a/.github/workflows/release-whl-deepgemm.yml b/.github/workflows/release-whl-deepgemm.yml
index b10c6a1d9..b321bc946 100644
--- a/.github/workflows/release-whl-deepgemm.yml
+++ b/.github/workflows/release-whl-deepgemm.yml
@@ -194,10 +194,9 @@ jobs:
           # - arch_label: sm120
           #   runner: 1-gpu-5090
           #   wheel_arch: x86_64
-          # Temporarily disabled while the GB300 runner is unavailable.
-          # - arch_label: sm100-aarch64
-          #   runner: 4-gpu-gb300
-          #   wheel_arch: aarch64
+          - arch_label: sm100-aarch64
+            runner: 4-gpu-gb300
+            wheel_arch: aarch64
     runs-on: ${{ matrix.runner }}
     timeout-minutes: 120
     steps:
diff --git a/.github/workflows/rerun-test.yml b/.github/workflows/rerun-test.yml
index 78d7be44f..cb0fda3de 100644
--- a/.github/workflows/rerun-test.yml
+++ b/.github/workflows/rerun-test.yml
@@ -87,8 +87,7 @@ permissions:
 
 jobs:
   rerun-test-cuda:
-    # Temporarily reject reruns targeting the broken GB300 runner.
-    if: inputs.mode == 'cuda' && inputs.runs_on != '4-gpu-gb300'
+    if: inputs.mode == 'cuda'
     runs-on: ${{ inputs.runs_on }}
     timeout-minutes: 120
     permissions:
@@ -200,8 +199,7 @@ jobs:
         if: failure()
 
   rerun-test-multimodal-gen:
-    # Temporarily reject reruns targeting the broken GB300 runner.
-    if: inputs.mode == 'multimodal_gen' && inputs.runs_on != '4-gpu-gb300'
+    if: inputs.mode == 'multimodal_gen'
     runs-on: ${{ inputs.runs_on }}
     timeout-minutes: 120
     permissions: