diff --git a/make-ppa b/make-ppa
index f8754ac..0fa4b42 100755
--- a/make-ppa
+++ b/make-ppa
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Creates source packages and uploads them to Launchpad.
 #
@@ -15,7 +15,7 @@ import re
 import argparse
 
 CHANGELOG = 'debian/changelog'
-DISTS = ['trusty', 'xenial', 'bionic', 'focal', 'jammy', 'kinetic']
+
 VERSION_PATTERN = re.compile(
     r'^(?P<name>[+-.a-z0-9]+)\s+\((?P<version>[^)]+)\)\s+(?P<dist>[^)]+); urgency=(?P<urgency>.+)$')
 OUTPUT_DIR = os.path.dirname(os.path.abspath(__file__))
@@ -24,14 +24,27 @@ if sys.version_info[0] < 3:
     input = raw_input
 
 
+def supported_distros():
+    distro_info = subprocess.check_output(
+        ['distro-info', '--supported', '--codename', '--days'], text=True
+    )
+
+    dists = []
+    for line in distro_info.splitlines():
+        name, days = line.split(' ')
+        if int(days) < 0:
+            dists.append(name)
+
+    return dists
+
+
 class Package(object):
 
-    def __init__(self, dists=DISTS, ppa='yubico/stable'):
+    def __init__(self, dists, ppa):
         self.dists = dists
 
-        file = open(CHANGELOG, 'r')
-        self.changelog = file.readlines()
-        file.close()
+        with open(CHANGELOG, 'r') as file:
+            self.changelog = file.readlines()
         match = VERSION_PATTERN.match(self.changelog[0])
 
         self.ppa = ppa
@@ -60,9 +73,8 @@ class Package(object):
         changelog = list(self.changelog)
         changelog[0] = line
 
-        file = open(CHANGELOG, 'w')
-        file.writelines(changelog)
-        file.close()
+        with open(CHANGELOG, 'w') as file:
+            file.writelines(changelog)
 
         os.system('debuild -S -sa -us -uc')
         os.system('mv ../%s_%s* %s/' %
@@ -92,9 +104,8 @@ class Package(object):
         for dist in self.dists:
             self.build_dist(dist)
 
-        file = open(CHANGELOG, 'w')
-        file.writelines(self.changelog)
-        file.close()
+        with open(CHANGELOG, 'w') as file:
+            file.writelines(self.changelog)
 
     def sign(self, key, program):
         args = [
@@ -118,7 +129,7 @@ if __name__ == '__main__':
                         help='Do not sign the packages (implies --no-upload)')
     parser.add_argument('--no-upload', action='store_false', dest='upload',
                         help='Do not upload the (signed) packages')
-    parser.add_argument('--dists', nargs='+', default=DISTS, metavar='DIST',
+    parser.add_argument('--dists', nargs='+', default=supported_distros(), metavar='DIST',
                         help='Distributions to build for')
     parser.add_argument('--ppa', nargs='?', default='yubico/stable',
                         help='PPA to upload to')