diff --git a/zuul/ansible/base/library/command.py b/zuul/ansible/base/library/command.py
index a3b969d9d7..0c461b3ae5 100755
--- a/zuul/ansible/base/library/command.py
+++ b/zuul/ansible/base/library/command.py
@@ -474,7 +474,7 @@ def zuul_run_command(self, args, zuul_log_id, check_rc=False, close_fds=True, ex
         if t:
             t.join(10)
             with Console(zuul_log_id) as console:
-                if t.isAlive():
+                if t.is_alive():
                     console.addLine("[Zuul] standard output/error still open "
                                     "after child exited")
             # ZUUL: stdout and stderr are in the console log file
@@ -495,7 +495,7 @@ def zuul_run_command(self, args, zuul_log_id, check_rc=False, close_fds=True, ex
     finally:
         if t:
             with Console(zuul_log_id) as console:
-                if t.isAlive():
+                if t.is_alive():
                     console.addLine("[Zuul] standard output/error still open "
                                     "after child exited")
                 if fail_json_kwargs:
diff --git a/zuul/lib/log_streamer.py b/zuul/lib/log_streamer.py
index 16b7222789..9ed124c595 100644
--- a/zuul/lib/log_streamer.py
+++ b/zuul/lib/log_streamer.py
@@ -181,7 +181,7 @@ class LogStreamer(object):
             raise
 
     def stop(self):
-        if self.thd.isAlive():
+        if self.thd.is_alive():
             self.server.shutdown()
             self.server.server_close()
             self.thd.join()