Index: grammalecte-cli.py
==================================================================
--- grammalecte-cli.py
+++ grammalecte-cli.py
@@ -130,11 +130,11 @@
             return (nError, cAction, vSugg)
 
 
 def main ():
     "launch the CLI (command line interface)"
-    if sys.version < "3.5":
+    if sys.version_info < (3, 5):
         print("Python 3.5+ required")
         return
 
     xParser = argparse.ArgumentParser()
     xParser.add_argument("-f", "--file", help="parse file (UTF-8 required!) [on Windows, -f is similar to -ff]", type=str)

Index: grammalecte-server.py
==================================================================
--- grammalecte-server.py
+++ grammalecte-server.py
@@ -318,11 +318,11 @@
     if dOptions:
         oGCE.setOptions(dOptions)
 
     # Python version
     print("Python: " + sys.version)
-    if sys.version < "3.7":
+    if sys.version_info.major < (3, 7):
         print("Python 3.7+ required")
         return
     # Grammalecte
     echo("Grammalecte v{}".format(oGCE.version))
     oGCE.displayOptions()

Index: make.py
==================================================================
--- make.py
+++ make.py
@@ -383,11 +383,11 @@
 
 
 def main ():
     "build Grammalecte with requested options"
     print("Python: " + sys.version)
-    if sys.version < "3.7":
+    if sys.version_info < (3, 7):
         print("Python 3.7+ required")
         return
     xParser = argparse.ArgumentParser()
     xParser.add_argument("lang", type=str, nargs='+', help="lang project to generate (name of folder in /lang)")
     xParser.add_argument("-uc", "--use_cache", help="use data cache instead of rebuilding rules", action="store_true")