diff --git a/ci/test-matrix.yml b/ci/test-matrix.yml
index df0b9600492..bd67db94ff2 100644
--- a/ci/test-matrix.yml
+++ b/ci/test-matrix.yml
@@ -111,8 +111,7 @@ linux:
     - { ARCH: 'amd64', PY_VER: '3.12',  CUDA_VER: '13.4.2', LOCAL_CTK: '0', GPU: 'a100',       GPU_COUNT: '1', DRIVER: 'latest',     ENV: { MODE: 'nightly-cuda-core' } }
     # nightly-standard (arm64 nightly-only runners — per runner team request)
     - { ARCH: 'arm64', PY_VER: '3.13',  CUDA_VER: '13.4.2', LOCAL_CTK: '1', GPU: 'gh200',      GPU_COUNT: '1', DRIVER: 'latest',     ENV: { MODE: 'nightly-standard' } }
-    # GB300 paused until runner thermal issues are resolved (NVBugs 6393185).
-    # - { ARCH: 'arm64', PY_VER: '3.14',  CUDA_VER: '13.4.2', LOCAL_CTK: '1', GPU: 'gb300',      GPU_COUNT: '1', DRIVER: 'latest',     ENV: { MODE: 'nightly-standard' } }
+    - { ARCH: 'arm64', PY_VER: '3.14',  CUDA_VER: '13.4.2', LOCAL_CTK: '1', GPU: 'gb300',      GPU_COUNT: '1', DRIVER: 'latest',     ENV: { MODE: 'nightly-standard' } }
     - { ARCH: 'arm64', PY_VER: '3.14',  CUDA_VER: '13.4.2', LOCAL_CTK: '1', GPU: 'l4',         GPU_COUNT: '2', DRIVER: 'latest',     ENV: { MODE: 'nightly-standard' } }
     - { ARCH: 'arm64', PY_VER: '3.14t', CUDA_VER: '13.4.2', LOCAL_CTK: '1', GPU: 'l4',         GPU_COUNT: '2', DRIVER: 'latest',     ENV: { MODE: 'nightly-standard' } }
     # amd64 with h200 (nightly-only, as there is only one server with h200s)