diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index fe362cb0e..ab4fca9c8 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -23,7 +23,7 @@ repos:
     -   id: black-jupyter
 -   repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-    rev: v0.0.284
+    rev: v0.0.285
     hooks:
     - id: ruff
       args: ["--fix"]
@@ -35,7 +35,7 @@ repos:
       args: ["--write"]
 # Python inside docs
 -   repo: https://github.com/asottile/blacken-docs
-    rev: 1.15.0
+    rev: 1.16.0
     hooks:
     -   id: blacken-docs
 ci:
diff --git a/dpdata/abacus/md.py b/dpdata/abacus/md.py
index 55538d0b1..4b8ec0387 100644
--- a/dpdata/abacus/md.py
+++ b/dpdata/abacus/md.py
@@ -206,7 +206,7 @@ def get_frame(fname):
     data["energies"] = energy
     data["forces"] = force
     data["virials"] = stress
-    if type(data["virials"]) != np.ndarray:
+    if not isinstance(data["virials"], np.ndarray):
         del data["virials"]
     data["orig"] = np.zeros(3)
 
diff --git a/dpdata/md/rdf.py b/dpdata/md/rdf.py
index d5409a0ce..de8f1c746 100644
--- a/dpdata/md/rdf.py
+++ b/dpdata/md/rdf.py
@@ -62,9 +62,9 @@ def _compute_rdf_1frame(box, posis, atype, sel_type=[None, None], max_r=5, nbins
         sel_type[0] = all_types
     if sel_type[1] is None:
         sel_type[1] = all_types
-    if type(sel_type[0]) is not list:
+    if not isinstance(sel_type[0], list):
         sel_type[0] = [sel_type[0]]
-    if type(sel_type[1]) is not list:
+    if not isinstance(sel_type[1], list):
         sel_type[1] = [sel_type[1]]
     natoms = len(posis)
     import ase.neighborlist
diff --git a/dpdata/system.py b/dpdata/system.py
index cf03aa617..daf0c8858 100644
--- a/dpdata/system.py
+++ b/dpdata/system.py
@@ -509,7 +509,7 @@ def check_type_map(self, type_map):
             self.sort_atom_names(type_map=type_map)
 
     def apply_type_map(self, type_map):
-        if type_map is not None and type(type_map) is list:
+        if type_map is not None and isinstance(type_map, list):
             self.check_type_map(type_map)
         else:
             raise RuntimeError("invalid type map, cannot be applied")
diff --git a/plugin_example/README.md b/plugin_example/README.md
index 322756f93..a506a4e88 100644
--- a/plugin_example/README.md
+++ b/plugin_example/README.md
@@ -6,6 +6,7 @@ pip install .
 
 ```py
 import dpdata
+
 print(dpdata.System(12, fmt="random"))
 ```