diff --git a/src/Mod/Fem/feminout/importCcxFrdResults.py b/src/Mod/Fem/feminout/importCcxFrdResults.py
index d0f206baf2..a031a2c741 100644
--- a/src/Mod/Fem/feminout/importCcxFrdResults.py
+++ b/src/Mod/Fem/feminout/importCcxFrdResults.py
@@ -716,7 +716,7 @@ def read_frd_result(
 
             """
             print("---- End of Section --> Mode_Results may be changed ----")
-            for key in sorted(mode_results.keys()):
+            for key in sorted(mode_results):
                 if key is "number" or key is "time":
                     print(key + " --> " + str(mode_results[key]))
                 else:
@@ -735,7 +735,7 @@ def read_frd_result(
             """
             print("\n\n----Append mode_results to results")
             print(line)
-            for key in sorted(mode_results.keys()):
+            for key in sorted(mode_results):
                 if key is "number" or key is "time":
                     print(key + " --> " + str(mode_results[key]))
                 else:
diff --git a/src/Mod/Fem/feminout/importToolsFem.py b/src/Mod/Fem/feminout/importToolsFem.py
index 0be7e3d95d..8738daf9c1 100644
--- a/src/Mod/Fem/feminout/importToolsFem.py
+++ b/src/Mod/Fem/feminout/importToolsFem.py
@@ -356,7 +356,7 @@ def fill_femresult_mechanical(
     if "disp" in result_set:
         disp = result_set["disp"]
         res_obj.DisplacementVectors = list(map((lambda x: x), disp.values()))
-        res_obj.NodeNumbers = list(disp.keys())
+        res_obj.NodeNumbers = list(disp)
 
         # fill res_obj.NodeStressXX etc if they exist in result_set
         # list values are just added
@@ -458,7 +458,7 @@ def fill_femresult_mechanical(
             res_obj.MassFlowRate = list(map((lambda x: x), MassFlow.values()))
             res_obj.Time = step_time
             # disp does not exist, res_obj.NodeNumbers needs to be set
-            res_obj.NodeNumbers = list(MassFlow.keys())
+            res_obj.NodeNumbers = list(MassFlow)
 
     # fill res_obj.NetworkPressure, disp does not exist, see MassFlow
     if "npressure" in result_set:
diff --git a/src/Mod/Fem/femmesh/gmshtools.py b/src/Mod/Fem/femmesh/gmshtools.py
index cfdc4edcf4..7aab42efe4 100644
--- a/src/Mod/Fem/femmesh/gmshtools.py
+++ b/src/Mod/Fem/femmesh/gmshtools.py
@@ -651,7 +651,7 @@ class GmshTools():
             # we use the element name of FreeCAD which starts
             # with 1 (example: "Face1"), same as Gmsh
             # for unit test we need them to have a fixed order
-            for group in sorted(self.group_elements.keys()):
+            for group in sorted(self.group_elements):
                 gdata = self.group_elements[group]
                 # print(gdata)
                 # geo.write("// " + group + "\n")
diff --git a/src/Mod/Fem/femmesh/meshtools.py b/src/Mod/Fem/femmesh/meshtools.py
index c41fb09fa0..6876291268 100644
--- a/src/Mod/Fem/femmesh/meshtools.py
+++ b/src/Mod/Fem/femmesh/meshtools.py
@@ -518,7 +518,7 @@ def get_femelement_sets(
     # get remaining femelements for the fem_objects
     if has_remaining_femelements:
         femelement_table_array = np.zeros_like(referenced_femelements)
-        femelement_table_array[list(femelement_table.keys())] = 1
+        femelement_table_array[list(femelement_table)] = 1
         remaining_femelements_array = femelement_table_array > referenced_femelements
         remaining_femelements = [
             i.item() for i in np.nditer(remaining_femelements_array.nonzero())
diff --git a/src/Mod/Fem/femsolver/elmer/sifio.py b/src/Mod/Fem/femsolver/elmer/sifio.py
index ad65a38ad7..ab88ac3198 100644
--- a/src/Mod/Fem/femsolver/elmer/sifio.py
+++ b/src/Mod/Fem/femsolver/elmer/sifio.py
@@ -305,7 +305,7 @@ class _Writer(object):
         self._stream.write(_SECTION_DELIM)
 
     def _writeSectionBody(self, s):
-        for key in sorted(s.keys()):  # def keys() from class sifio.Section is called
+        for key in sorted(s):  # def keys() from class sifio.Section is called
             self._writeAttribute(key, s[key])
 
     def _writeAttribute(self, key, data):
diff --git a/src/Mod/Fem/femtaskpanels/task_material_common.py b/src/Mod/Fem/femtaskpanels/task_material_common.py
index 952bd0ea24..ecc0e02224 100644
--- a/src/Mod/Fem/femtaskpanels/task_material_common.py
+++ b/src/Mod/Fem/femtaskpanels/task_material_common.py
@@ -750,13 +750,13 @@ class _TaskPanel:
         card_name_list = []  # [ [card_name, card_path, icon_path], ... ]
 
         if sort_by_resources is True:
-            for a_path in sorted(self.materials.keys()):
+            for a_path in sorted(self.materials):
                 card_name_list.append([self.cards[a_path], a_path, self.icons[a_path]])
         else:
             card_names_tmp = {}
             for path, name in self.cards.items():
                 card_names_tmp[name] = path
-            for a_name in sorted(card_names_tmp.keys()):
+            for a_name in sorted(card_names_tmp):
                 a_path = card_names_tmp[a_name]
                 card_name_list.append([a_name, a_path, self.icons[a_path]])
 
diff --git a/src/Mod/Fem/femtaskpanels/task_material_reinforced.py b/src/Mod/Fem/femtaskpanels/task_material_reinforced.py
index d2feadd274..f8549bd658 100644
--- a/src/Mod/Fem/femtaskpanels/task_material_reinforced.py
+++ b/src/Mod/Fem/femtaskpanels/task_material_reinforced.py
@@ -410,13 +410,13 @@ class _TaskPanel:
         card_name_list = []  # [ [card_name, card_path, icon_path], ... ]
 
         if sort_by_resources is True:
-            for a_path in sorted(self.materials.keys()):
+            for a_path in sorted(self.materials):
                 card_name_list.append([self.cards[a_path], a_path, self.icons[a_path]])
         else:
             card_names_tmp = {}
             for path, name in self.cards.items():
                 card_names_tmp[name] = path
-            for a_name in sorted(card_names_tmp.keys()):
+            for a_name in sorted(card_names_tmp):
                 a_path = card_names_tmp[a_name]
                 card_name_list.append([a_name, a_path, self.icons[a_path]])