diff --git a/src/formdefinition.py b/src/formdefinition.py
index 64b06d4..f8525b4 100644
--- a/src/formdefinition.py
+++ b/src/formdefinition.py
@@ -84,7 +84,7 @@ class FormDefinition(object):
                 value = self._field_validate(field_name, form_values)
                 if value is not None:
                     values[field_name] = value
-            except ValidationError, err:
+            except ValidationError as err:
                 errors.setdefault(field_name, []).append(str(err))
 
         return (errors, values)
diff --git a/src/scriptform.py b/src/scriptform.py
index c8a1943..c64f21e 100755
--- a/src/scriptform.py
+++ b/src/scriptform.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
 # Scriptform roughly works like this:
@@ -234,14 +234,14 @@ def main():  # pragma: no cover
             elif options.action_stop:
                 daemon.stop()
                 sys.exit(0)
-        except socket.error, err:
+        except socket.error as err:
             log.exception(err)
             sys.stderr.write("Cannot bind to port {}: {}\n".format(
                 options.port,
                 str(err)
             ))
             sys.exit(2)
-        except Exception, err:
+        except Exception as err:
             log.exception(err)
             raise
 
diff --git a/src/webserver.py b/src/webserver.py
index 436b43a..cecf771 100644
--- a/src/webserver.py
+++ b/src/webserver.py
@@ -95,7 +95,7 @@ class RequestHandler(BaseHTTPRequestHandler):
             else:
                 raise HTTPError(404, "Not found")
             method_cb(**params)
-        except HTTPError, err:
+        except HTTPError as err:
             # HTTP erors are generally thrown by the webapp on purpose. Send
             # error to the browser.
             if err.status_code not in (401, ):
@@ -108,7 +108,7 @@ class RequestHandler(BaseHTTPRequestHandler):
                                                    err.msg))
             self.wfile.flush()
             return False
-        except Exception, err:
+        except Exception as err:
             self.scriptform.log.exception(err)
             self.send_error(500, "Internal server error")
             raise