diff --git a/pyproject.toml b/pyproject.toml
index 84d6d86d93..decc0e9f5f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -60,7 +60,7 @@ huggingfacenotorch = [
 ]
 huggingface = [
     "unsloth[huggingfacenotorch]",
-    "unsloth_zoo>=2025.12.6",
+    "unsloth_zoo>=2025.12.7",
     "torchvision",
     "unsloth[triton]",
 ]
@@ -523,7 +523,7 @@ colab-ampere-torch220 = [
     "flash-attn>=2.6.3 ; ('linux' in sys_platform)",
 ]
 colab-new = [
-    "unsloth_zoo>=2025.12.6",
+    "unsloth_zoo>=2025.12.7",
     "packaging",
     "tyro",
     "transformers>=4.51.3,!=4.52.0,!=4.52.1,!=4.52.2,!=4.52.3,!=4.53.0,!=4.54.0,!=4.55.0,!=4.55.1,!=4.57.0,<=4.57.3",
diff --git a/unsloth/models/_utils.py b/unsloth/models/_utils.py
index 9929277719..abc8380562 100644
--- a/unsloth/models/_utils.py
+++ b/unsloth/models/_utils.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "2025.12.8"
+__version__ = "2025.12.9"
 
 __all__ = [
     "SUPPORTS_BFLOAT16",
diff --git a/unsloth/models/rl.py b/unsloth/models/rl.py
index 31316e45b7..4ea36519d9 100644
--- a/unsloth/models/rl.py
+++ b/unsloth/models/rl.py
@@ -812,8 +812,13 @@ def _patch_trl_rl_trainers(trainer_file = "grpo_trainer"):
     if "dataset_num_proc" in call_args:
         num_proc_check = (
             "if dataset_num_proc is None:\n"
-            "    from multiprocessing import cpu_count\n"
-            "    dataset_num_proc = min(max(cpu_count()+4, 2), 64)\n"
+            "    import psutil\n"
+            "    dataset_num_proc = min(max(psutil.cpu_count()+4, 2), 64)\n"
+            "    memory_gb_left = psutil.virtual_memory().available / (1024**3)\n"
+            "    if   memory_gb_left <=  4: dataset_num_proc = 1 # Too risky, so set to 1\n"
+            "    elif memory_gb_left <=  6: dataset_num_proc = min(2, dataset_num_proc)\n"
+            "    elif memory_gb_left <= 10: dataset_num_proc = min(4, dataset_num_proc)\n"
+            "    elif memory_gb_left <= 14: dataset_num_proc = min(6, dataset_num_proc)\n"
         )
         extra_args += num_proc_check