diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0032ff2..a0de71f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -2,6 +2,7 @@ name: Test
 on: [push, pull_request]
 jobs:
   check:
+    if: github.event_name != 'push' || github.ref != 'refs/heads/devel'
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -37,6 +38,7 @@ jobs:
     - if: startsWith(matrix.python, '3')
       run: pre-commit run -a --show-diff-on-failure
   test:
+    if: github.event_name != 'pull_request' || github.head_ref != 'devel'
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -58,6 +60,7 @@ jobs:
       env:
         CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
   matlab:
+    if: github.event_name != 'pull_request' || github.head_ref != 'devel'
     runs-on: [self-hosted, python, cuda, matlab]
     name: Test matlab & cuda
     steps:
diff --git a/miutil/mlab/__init__.py b/miutil/mlab/__init__.py
index 193c92b..46882e8 100644
--- a/miutil/mlab/__init__.py
+++ b/miutil/mlab/__init__.py
@@ -2,11 +2,15 @@
 import re
 import sys
 from ast import literal_eval
-from functools import lru_cache
 from os import getenv, path
 from subprocess import STDOUT, CalledProcessError, check_output
 from textwrap import dedent
 
+try:
+    from functools import lru_cache
+except ImportError:
+    from backports.functools_lru_cache import lru_cache
+
 from ..fdio import tmpdir
 
 __all__ = ["get_engine"]
diff --git a/miutil/mlab/beautify.py b/miutil/mlab/beautify.py
index 99ea928..4dcb31f 100755
--- a/miutil/mlab/beautify.py
+++ b/miutil/mlab/beautify.py
@@ -6,7 +6,7 @@
   <mfile>  : Path to `*.m` file
 """
 import logging
-from functools import lru_cache, wraps
+from functools import wraps
 from os import path
 from zipfile import ZipFile
 
@@ -14,7 +14,7 @@
 from tqdm.contrib import tmap
 
 from ..web import get_file
-from . import get_engine
+from . import get_engine, lru_cache
 
 log = logging.getLogger(__name__)
 MBEAUTIFIER_REV = "9c3c82387ec3c0fb29e707ebd060e8e2ca9ea6f2"
diff --git a/setup.cfg b/setup.cfg
index 9a94d1c..2de4924 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -79,5 +79,5 @@ profile=black
 known_first_party=miutil,tests
 
 [tool:pytest]
-timeout=10
+timeout=15
 addopts=-v --tb=short -rxs -W=error --log-level=debug -n=auto --durations=0 --cov=miutil --cov-report=term-missing --cov-report=xml