diff --git a/epanet/epanet.py b/epanet/epanet.py
index bc297c0..2251ff2 100644
--- a/epanet/epanet.py
+++ b/epanet/epanet.py
@@ -264,10 +264,14 @@ def run_project(name: str, version: str = '3') -> str:
     return json.dumps(data)
 
 
-def run_inp(name: str) -> str:
+def run_inp(name: str, version: str = '3') -> str:
+    if version != '3' and version != '2':
+        version = '2'
+
     dir = os.path.abspath(os.getcwd())
 
-    exe = os.path.join(os.path.join(dir, 'epanet'), 'runepanet.exe')
+    program = 'runepanet.exe' if version == '2' else 'run-epanet3.exe'
+    exe = os.path.join(os.path.join(dir, 'epanet'), program)
     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')
@@ -280,7 +284,10 @@ def run_inp(name: str) -> str:
         data['simulation_result'] = 'failed'
     else:
         data['simulation_result'] = 'successful'
-        data |= _dump_output(opt)
+        if version == '2':
+            data |= _dump_output(opt)
+        else:
+            pass # TODO: epanet3 output format?
 
     data['report'] = dump_report(rpt)
 
diff --git a/tjnetwork.py b/tjnetwork.py
index 52f9f28..9ce64ad 100644
--- a/tjnetwork.py
+++ b/tjnetwork.py
@@ -201,8 +201,8 @@ def run_project(name: str, version: str = '3') -> str:
     return epanet.run_project(name, version)
 
 # put in inp folder, name without extension
-def run_inp(name: str) -> str:
-    return epanet.run_inp(name)
+def run_inp(name: str, version: str = '3') -> str:
+    return epanet.run_inp(name, version)
 
 # path is absolute path
 def dump_output(path: str) -> str: