diff --git a/dev/merge_arrow_pr.py b/dev/merge_arrow_pr.py
index b724a1971c0..9d71ca74292 100755
--- a/dev/merge_arrow_pr.py
+++ b/dev/merge_arrow_pr.py
@@ -42,9 +42,6 @@
 import requests
 import getpass
 
-from six.moves import input
-import six
-
 try:
     import jira.client
     import jira.exceptions
@@ -76,7 +73,7 @@ def get_json(url, headers=None):
 
 
 def run_cmd(cmd):
-    if isinstance(cmd, six.string_types):
+    if isinstance(cmd, str):
         cmd = cmd.split(' ')
 
     try:
@@ -90,7 +87,7 @@ def run_cmd(cmd):
         print('--------------')
         raise e
 
-    if isinstance(output, six.binary_type):
+    if isinstance(output, bytes):
         output = output.decode('utf-8')
     return output
 
diff --git a/dev/requirements_merge_arrow_pr.txt b/dev/requirements_merge_arrow_pr.txt
index 7ac17dc1b19..99909e434a5 100644
--- a/dev/requirements_merge_arrow_pr.txt
+++ b/dev/requirements_merge_arrow_pr.txt
@@ -1,3 +1,2 @@
 jira
 requests
-six