diff --git a/epanet/epanet.py b/epanet/epanet.py
index 330639e..8ce2275 100644
--- a/epanet/epanet.py
+++ b/epanet/epanet.py
@@ -227,21 +227,17 @@ def dump_output(path: str) -> str:
     return json.dumps(data)
 
 
-def run_project(name: str, version: str = '2') -> str:
-    if version != '3' and version != '2':
-        version = '2'
-
+def run_project(name: str) -> str:
     if not project.have_project(name):
         raise Exception(f'Not found project [{name}]')
 
     dir = os.path.abspath(os.getcwd())
 
     db_inp = os.path.join(os.path.join(dir, 'db_inp'), name + '.db.inp')
-    inp_out.dump_inp(name, db_inp, version)
+    inp_out.dump_inp(name, db_inp, '2')
 
     input = name + '.db'
-    program = 'runepanet.exe' if version == '2' else 'run-epanet3.exe'
-    exe = os.path.join(os.path.join(dir, 'epanet'), program)
+    exe = os.path.join(os.path.join(dir, 'epanet'), 'runepanet.exe')
     inp = os.path.join(os.path.join(dir, 'db_inp'), input + '.inp')
     rpt = os.path.join(os.path.join(dir, 'temp'), input + '.rpt')
     opt = os.path.join(os.path.join(dir, 'temp'), input + '.opt')
@@ -254,24 +250,17 @@ def run_project(name: str, version: str = '2') -> str:
         data['simulation_result'] = 'failed'
     else:
         data['simulation_result'] = 'successful'
-        if version == '2':
-            data |= _dump_output(opt)
-        else:
-            pass # TODO: epanet3 output format?
+        data |= _dump_output(opt)
 
     data['report'] = dump_report(rpt)
 
     return json.dumps(data)
 
 
-def run_inp(name: str, version: str = '2') -> str:
-    if version != '3' and version != '2':
-        version = '2'
-
+def run_inp(name: str) -> str:
     dir = os.path.abspath(os.getcwd())
 
-    program = 'runepanet.exe' if version == '2' else 'run-epanet3.exe'
-    exe = os.path.join(os.path.join(dir, 'epanet'), program)
+    exe = os.path.join(os.path.join(dir, 'epanet'), 'runepanet.exe')
     inp = os.path.join(os.path.join(dir, 'inp'), name + '.inp')
     rpt = os.path.join(os.path.join(dir, 'temp'), name + '.rpt')
     opt = os.path.join(os.path.join(dir, 'temp'), name + '.opt')
@@ -284,10 +273,7 @@ def run_inp(name: str, version: str = '2') -> str:
         data['simulation_result'] = 'failed'
     else:
         data['simulation_result'] = 'successful'
-        if version == '2':
-            data |= _dump_output(opt)
-        else:
-            pass # TODO: epanet3 output format?
+        data |= _dump_output(opt)
 
     data['report'] = dump_report(rpt)
 
diff --git a/epanet/epanet3.dll b/epanet/epanet3.dll
deleted file mode 100644
index eba642c..0000000
Binary files a/epanet/epanet3.dll and /dev/null differ
diff --git a/epanet/run-epanet3.exe b/epanet/run-epanet3.exe
deleted file mode 100644
index 5fe4f3e..0000000
Binary files a/epanet/run-epanet3.exe and /dev/null differ
diff --git a/tjnetwork.py b/tjnetwork.py
index 12bfeb4..31c62e3 100644
--- a/tjnetwork.py
+++ b/tjnetwork.py
@@ -200,12 +200,12 @@ def import_inp(name: str, cs: ChangeSet, version: str = '3') -> bool:
 def export_inp(name: str, version: str = '3') -> ChangeSet:
     return api.export_inp(name, version)
 
-def run_project(name: str, version: str = '2') -> str:
-    return epanet.run_project(name, version)
+def run_project(name: str) -> str:
+    return epanet.run_project(name)
 
 # put in inp folder, name without extension
-def run_inp(name: str, version: str = '2') -> str:
-    return epanet.run_inp(name, version)
+def run_inp(name: str) -> str:
+    return epanet.run_inp(name)
 
 # path is absolute path
 def dump_output(path: str) -> str: