diff --git a/autotest/ci_setup.py b/autotest/ci_setup.py
index e77b66d..268fb28 100644
--- a/autotest/ci_setup.py
+++ b/autotest/ci_setup.py
@@ -2,6 +2,8 @@
 import pathlib as pl
 import shutil
 
+from modflow_devtools.misc import get_model_paths
+
 import pymake
 
 temp_pth = pl.Path("temp")
@@ -54,27 +56,8 @@ def examples_list(verbose=False):
         "sagehen",
         "ex-gwt-keating",
     )
-    src_folders = []
-
-    for dirName, subdirList, fileList in os.walk(mf6_exdir):
-        useModel = True
-        for exclude in exclude_models:
-            if exclude in dirName:
-                useModel = False
-                break
-        if useModel:
-            for exclude in exclude_examples:
-                if exclude in dirName:
-                    useModel = False
-                    break
-        if useModel:
-            for file_name in fileList:
-                if file_name.lower() == "mfsim.nam":
-                    if verbose:
-                        print(f"Found directory: {dirName}")
-                    src_folders.append(dirName)
-    src_folders = sorted(src_folders)
 
+    src_folders = get_model_paths(mf6_exdir)
     fpth = os.path.join(mf6_exdir, "mf6examples.txt")
     f = open(fpth, "w")
     for idx, folder in enumerate(src_folders):
diff --git a/pymake/pymake.py b/pymake/pymake.py
index 05206aa..b715a96 100644
--- a/pymake/pymake.py
+++ b/pymake/pymake.py
@@ -622,6 +622,7 @@ def _set_extrafiles(self):
         if extrafiles is None:
             if self._get_base_target() in ("zbud6",):
                 extrafiles = [
+                    "../../../src/Utilities/CharString.f90",
                     "../../../src/Utilities/ArrayHandlers.f90",
                     "../../../src/Utilities/ArrayReaders.f90",
                     "../../../src/Utilities/BlockParser.f90",
diff --git a/pymake/utils/usgsprograms.txt b/pymake/utils/usgsprograms.txt
index 900c56b..a4414d3 100644
--- a/pymake/utils/usgsprograms.txt
+++ b/pymake/utils/usgsprograms.txt
@@ -1,7 +1,7 @@
 target     ,  version,  current, url                                                                                            , dirname             , srcdir              ,    standard_switch, double_switch, shared_object
-mf6        ,  6.4.4  ,  True   , https://github.com/MODFLOW-USGS/modflow6/releases/download/6.4.4/mf6.4.4_linux.zip             , mf6.4.4_linux       , src                 ,    True           , False        , False
-zbud6      ,  6.4.4  ,  True   , https://github.com/MODFLOW-USGS/modflow6/releases/download/6.4.4/mf6.4.4_linux.zip             , mf6.4.4_linux       , utils/zonebudget/src,    True           , False        , False
-libmf6     ,  6.4.4  ,  True   , https://github.com/MODFLOW-USGS/modflow6/releases/download/6.4.4/mf6.4.4_linux.zip             , mf6.4.4_linux       , srcbmi              ,    True           , False        , True
+mf6        ,  6.5.0  ,  True   , https://github.com/MODFLOW-USGS/modflow6/releases/download/6.5.0/mf6.5.0_linux.zip             , mf6.5.0_linux       , src                 ,    True           , False        , False
+zbud6      ,  6.5.0  ,  True   , https://github.com/MODFLOW-USGS/modflow6/releases/download/6.5.0/mf6.5.0_linux.zip             , mf6.5.0_linux       , utils/zonebudget/src,    True           , False        , False
+libmf6     ,  6.5.0  ,  True   , https://github.com/MODFLOW-USGS/modflow6/releases/download/6.5.0/mf6.5.0_linux.zip             , mf6.5.0_linux       , srcbmi              ,    True           , False        , True
 mp7        ,  7.2.001,  True   , https://water.usgs.gov/water-resources/software/MODPATH/modpath_7_2_001.zip                    , modpath_7_2_001     , source              ,    True           , False        , False
 mt3dms     ,  5.3.0  ,  True   , https://github.com/MODFLOW-USGS/mt3dms/releases/download/2.0/mt3dms-2.0.zip                    , mt3dms-2.0          , true-binary         ,    True           , False        , False
 mt3dusgs   ,  1.1.0  ,  True   , https://water.usgs.gov/water-resources/software/MT3D-USGS/mt3dusgs1.1.0.zip                    , mt3dusgs1.1.0       , src                 ,    True           , False        , False
@@ -22,6 +22,6 @@ mfnwt1.1.4 ,  1.1.4  ,  False  , https://water.usgs.gov/water-resources/software
 mfnwt      ,  1.3.0  ,  True   , https://water.usgs.gov/water-resources/software/MODFLOW-NWT/MODFLOW-NWT_1.3.0.zip              , MODFLOW-NWT         , src                 ,    True           , False        , False
 mfusg_gsi  ,  2.2.2  ,  True   , https://www.gsienv.com/wp-content/uploads/2023/11/USG-Transport_Version-2.2.2.zip              , USGT-v2-2-2-Source  , .                   ,    True           , False        , False
 gsflow     ,  2.2.1  ,  True   , https://water.usgs.gov/water-resources/software/gsflow/gsflow_2.2.1_linux.zip                  , gsflow_2.2.1        , src                 ,    True           , False        , False
-mf6dev     ,  6.5.0.dev0 ,  False  , https://github.com/MODFLOW-USGS/modflow6/archive/refs/heads/develop.zip                    , modflow6-develop    , src                 ,    True           , False        , False
-zbud6dev   ,  6.5.0.dev0 ,  False  , https://github.com/MODFLOW-USGS/modflow6/archive/refs/heads/develop.zip                    , modflow6-develop    , utils/zonebudget/src,    True           , False        , False
-libmf6dev  ,  6.5.0.dev0 ,  False  , https://github.com/MODFLOW-USGS/modflow6/archive/refs/heads/develop.zip                    , modflow6-develop    , srcbmi              ,    True           , False        , True
\ No newline at end of file
+mf6dev     ,  6.6.0.dev0 ,  False  , https://github.com/MODFLOW-USGS/modflow6/archive/refs/heads/develop.zip                    , modflow6-develop    , src                 ,    True           , False        , False
+zbud6dev   ,  6.6.0.dev0 ,  False  , https://github.com/MODFLOW-USGS/modflow6/archive/refs/heads/develop.zip                    , modflow6-develop    , utils/zonebudget/src,    True           , False        , False
+libmf6dev  ,  6.6.0.dev0 ,  False  , https://github.com/MODFLOW-USGS/modflow6/archive/refs/heads/develop.zip                    , modflow6-develop    , srcbmi              ,    True           , False        , True
\ No newline at end of file