diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 3ca7d3efd..b41824a4c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -17,7 +17,7 @@ repos:
     rev: v0.0.286
     hooks:
       - id: ruff
-        args: [--fix, --exit-non-zero-on-fix]
+        args: [--fix, --exit-non-zero-on-fix, --ignore=PD002]
   - repo: https://github.com/psf/black
     rev: 23.7.0
     hooks:
diff --git a/python/ribasim/ribasim/input_base.py b/python/ribasim/ribasim/input_base.py
index f4acc07d6..17a5f808c 100644
--- a/python/ribasim/ribasim/input_base.py
+++ b/python/ribasim/ribasim/input_base.py
@@ -197,5 +197,5 @@ def sort(self):
             if dataframe is None:
                 continue
             else:
-                dataframe = dataframe.sort_values("node_id", ignore_index=True)
+                dataframe.sort_values("node_id", ignore_index=True, inplace=True)
         return
diff --git a/python/ribasim/ribasim/node_types/basin.py b/python/ribasim/ribasim/node_types/basin.py
index 3f7f00537..d46600d44 100644
--- a/python/ribasim/ribasim/node_types/basin.py
+++ b/python/ribasim/ribasim/node_types/basin.py
@@ -60,12 +60,12 @@ class Basin(TableModel):
     state: Optional[DataFrame[StateSchema]] = None
 
     def sort(self):
-        self.profile = self.profile.sort_values(["node_id", "level"], ignore_index=True)
+        self.profile.sort_values(["node_id", "level"], ignore_index=True, inplace=True)
         if self.static is not None:
-            self.static = self.static.sort_values("node_id", ignore_index=True)
+            self.static.sort_values("node_id", ignore_index=True, inplace=True)
         if self.forcing is not None:
-            self.forcing = self.forcing.sort_values(
-                ["time", "node_id"], ignore_index=True
+            self.forcing.sort_values(
+                ["time", "node_id"], ignore_index=True, inplace=True
             )
         if self.state is not None:
-            self.state = self.state.sort_values("node_id", ignore_index=True)
+            self.state.sort_values("node_id", ignore_index=True, inplace=True)
diff --git a/python/ribasim/ribasim/node_types/fractional_flow.py b/python/ribasim/ribasim/node_types/fractional_flow.py
index d86d5e40e..46d2da516 100644
--- a/python/ribasim/ribasim/node_types/fractional_flow.py
+++ b/python/ribasim/ribasim/node_types/fractional_flow.py
@@ -28,4 +28,4 @@ class FractionalFlow(TableModel):
     static: DataFrame[StaticSchema]
 
     def sort(self):
-        self.static = self.static.sort_values("node_id", ignore_index=True)
+        self.static.sort_values("node_id", ignore_index=True, inplace=True)
diff --git a/python/ribasim/ribasim/node_types/tabulated_rating_curve.py b/python/ribasim/ribasim/node_types/tabulated_rating_curve.py
index cded2f9f1..32b831c78 100644
--- a/python/ribasim/ribasim/node_types/tabulated_rating_curve.py
+++ b/python/ribasim/ribasim/node_types/tabulated_rating_curve.py
@@ -42,8 +42,11 @@ class TabulatedRatingCurve(TableModel):
     time: Optional[DataFrame[TimeSchema]] = None
 
     def sort(self):
-        self.static = self.static.sort_values(["node_id", "level"], ignore_index=True)
+        if self.static:
+            self.static.sort_values(
+                ["node_id", "level"], ignore_index=True, inplace=True
+            )
         if self.time is not None:
-            self.time = self.time.sort_values(
-                ["time", "node_id", "level"], ignore_index=True
+            self.time.sort_values(
+                ["time", "node_id", "level"], ignore_index=True, inplace=True
             )