diff --git a/env.yml b/env.yml
index a7af26a7..b5983af3 100644
--- a/env.yml
+++ b/env.yml
@@ -2,7 +2,7 @@ name: suews-dev
 channels:
   - conda-forge
 dependencies:
-  - python=3.10
+  - python=3.11
   - geopandas
   - geoplot
   - pandas
diff --git a/src/supy/supy/_post.py b/src/supy/supy/_post.py
index 5a54bc75..44cddbc6 100644
--- a/src/supy/supy/_post.py
+++ b/src/supy/supy/_post.py
@@ -7,16 +7,21 @@
 # post-processing part
 # get variable information from Fortran
 def get_output_info_df():
+    from packaging.version import parse as LooseVersion
+
     size_var_list = sd.output_size()
     var_list_x = [np.array(sd.output_name_n(i)) for i in np.arange(size_var_list) + 1]
 
     df_var_list = pd.DataFrame(var_list_x, columns=["var", "group", "aggm", "outlevel"])
-    if pd.__version__ >= "2.1.0":
+
+    # strip leading and trailing spaces
+    fun_strip = lambda x: x.decode().strip()
+    if LooseVersion(pd.__version__) >= LooseVersion("2.1.0"):
         # if pandas version is 2.1.0 or above, we can use `df.map`
-        df_var_list = df_var_list.map(lambda x: x.strip())
+        df_var_list = df_var_list.map(fun_strip)
     else:
         # otherwise, we need to use `df.applymap`
-        df_var_list = df_var_list.applymap(lambda x: x.decode().strip())
+        df_var_list = df_var_list.applymap(fun_strip)
 
     df_var_list_x = df_var_list.replace(r"^\s*$", np.nan, regex=True).dropna()
     var_dfm = df_var_list_x.set_index(["group", "var"])
diff --git a/src/supy/supy/test/test_SuPy.py b/src/supy/supy/test/test_SuPy.py
index f673e8ab..45477aac 100644
--- a/src/supy/supy/test/test_SuPy.py
+++ b/src/supy/supy/test/test_SuPy.py
@@ -23,7 +23,7 @@
 p_df_sample = Path(test_data_dir) / 'sample_output.pkl'
 
 # if platform is macOS and python version is 3.9, set flag_full_test to True
-flag_full_test = (sys.version_info[0] == 3 and sys.version_info[1] == 10 and platform.system() == "Darwin")
+flag_full_test = (sys.version_info[0] == 3 and sys.version_info[1] == 11 and platform.system() == "Darwin")
 
 class TestSuPy(TestCase):
     def setUp(self):