diff --git a/dev-tools/scripts/releaseWizard.py b/dev-tools/scripts/releaseWizard.py
index d599095619d..3814ae38a78 100755
--- a/dev-tools/scripts/releaseWizard.py
+++ b/dev-tools/scripts/releaseWizard.py
@@ -49,6 +49,7 @@ import urllib
 from collections import OrderedDict
 from datetime import datetime
 from datetime import timedelta
+from datetime import timezone
 
 try:
     import holidays
@@ -99,7 +100,7 @@ def expand_jinja(text, vars=None):
         'state': state,
         'gpg_key' : state.get_gpg_key(),
         'gradle_cmd' : 'gradlew.bat' if is_windows() else './gradlew',
-        'epoch': unix_time_millis(datetime.utcnow()),
+        'epoch': unix_time_millis(datetime.now(tz=timezone.utc)),
         'get_next_version': state.get_next_version(),
         'current_git_rev': state.get_current_git_rev(),
         'keys_downloaded': keys_downloaded(),
@@ -199,7 +200,7 @@ def check_prerequisites(todo=None):
     return True
 
 
-epoch = datetime.utcfromtimestamp(0)
+epoch = datetime.fromtimestamp(timestamp=0, tz=timezone.utc)
 
 
 def unix_time_millis(dt):
@@ -279,7 +280,7 @@ class ReleaseState:
         self.latest_version = None
         self.previous_rcs = {}
         self.rc_number = 1
-        self.start_date = unix_time_millis(datetime.utcnow())
+        self.start_date = unix_time_millis(datetime.now(tz=timezone.utc))
         self.script_branch = run("git rev-parse --abbrev-ref HEAD").strip()
         self.mirrored_versions = None
         try:
@@ -741,7 +742,7 @@ class Todo(SecretYamlObject):
 
     def set_done(self, is_done):
         if is_done:
-            self.state['done_date'] = unix_time_millis(datetime.utcnow())
+            self.state['done_date'] = unix_time_millis(datetime.now(tz=timezone.utc))
             if self.persist_vars:
                 for k in self.persist_vars:
                     self.state[k] = self.get_vars()[k]
@@ -935,7 +936,7 @@ def expand_multiline(cmd_txt, indent=0):
 
 
 def unix_to_datetime(unix_stamp):
-    return datetime.utcfromtimestamp(unix_stamp / 1000)
+    return datetime.fromtimestamp(timestamp=unix_stamp / 1000, tz=timezone.utc)
 
 
 def generate_asciidoc():
@@ -949,7 +950,7 @@ def generate_asciidoc():
 
     fh.write("= Lucene Release %s\n\n" % state.release_version)
     fh.write("(_Generated by releaseWizard.py v%s at %s_)\n\n"
-             % (getScriptVersion(), datetime.utcnow().strftime("%Y-%m-%d %H:%M UTC")))
+             % (getScriptVersion(), datetime.now(tz=timezone.utc).strftime("%Y-%m-%d %H:%M UTC")))
     fh.write(":numbered:\n\n")
     fh.write("%s\n\n" % template('help'))
     for group in state.todo_groups:
@@ -1839,9 +1840,9 @@ def create_ical(todo): # pylint: disable=unused-argument
     return True
 
 
-today = datetime.utcnow().date()
+today = datetime.now(tz=timezone.utc).date()
 sundays = {(today + timedelta(days=x)): 'Sunday' for x in range(10) if (today + timedelta(days=x)).weekday() == 6}
-y = datetime.utcnow().year
+y = datetime.now(tz=timezone.utc).year
 years = [y, y+1]
 non_working = holidays.CA(years=years) + holidays.US(years=years) + holidays.UK(years=years) \
               + holidays.DE(years=years) + holidays.NO(years=years) + holidays.IN(years=years) + holidays.RU(years=years)
@@ -1849,7 +1850,7 @@ non_working = holidays.CA(years=years) + holidays.US(years=years) + holidays.UK(
 
 def vote_close_72h_date():
     # Voting open at least 72 hours according to ASF policy
-    return datetime.utcnow() + timedelta(hours=73)
+    return datetime.now(tz=timezone.utc) + timedelta(hours=73)
 
 
 def vote_close_72h_holidays():