diff --git a/lib/sysgeneral.py b/lib/sysgeneral.py
index 3af9f4d..ba050ac 100644
--- a/lib/sysgeneral.py
+++ b/lib/sysgeneral.py
@@ -33,7 +33,7 @@ class SysGeneral:
 
     def __del__(self):
         if not self.preserve_tmp:
-            print("Unmounting tmpfs from %s" % (self.tmp_dir))
+            print(f"Unmounting tmpfs from {self.tmp_dir}")
             umount(self.tmp_dir)
             os.rmdir(self.tmp_dir)
 
@@ -41,7 +41,7 @@ class SysGeneral:
         """Mount the tmpfs for this sysx"""
         if not os.path.isdir(self.tmp_dir):
             os.mkdir(self.tmp_dir)
-        print("Mounting tmpfs on %s" % (self.tmp_dir))
+        print(f"Mounting tmpfs on {self.tmp_dir}")
         mount('tmpfs', self.tmp_dir, 'tmpfs', 'size=8G')
 
     def check_file(self, file_name):
@@ -80,7 +80,7 @@ class SysGeneral:
 
         # Actually download the file
         if not os.path.isfile(abs_file_name):
-            print("Downloading: %s" % (file_name))
+            print(f"Downloading: {file_name}")
             request = requests.get(url, allow_redirects=True)
             # pylint: disable=consider-using-with
             open(abs_file_name, 'wb').write(request.content)
diff --git a/rootfs.py b/rootfs.py
index c2619a4..4949e0c 100755
--- a/rootfs.py
+++ b/rootfs.py
@@ -81,7 +81,7 @@ def main():
 
 def bootstrap(args, system_a, system_b, system_c):
     """Kick off bootstrap process."""
-    print("Bootstrapping %s -- SysA" % (args.arch))
+    print(f"Bootstrapping {args.arch} -- SysA")
     if args.chroot:
         find_chroot = """
 import shutil
@@ -97,7 +97,7 @@ print(shutil.which('chroot'))
         # We skip sysb as that is only pertinent to "hardware" (not chroot)
         system_c.chroot_transition(system_a.tmp_dir)
         # sysc
-        print("Bootstrapping %s -- SysC" % (args.arch))
+        print(f"Bootstrapping {args.arch} -- SysC")
         init = os.path.join(os.sep, 'init')
         run('sudo', chroot_binary, system_c.tmp_dir, init)
 
diff --git a/sysc.py b/sysc.py
index 1f9a598..2a8c547 100755
--- a/sysc.py
+++ b/sysc.py
@@ -35,9 +35,9 @@ class SysC(SysGeneral):
     def __del__(self):
         if not self.preserve_tmp:
             if not self.chroot:
-                print("Deleting %s" % (self.dev_name))
+                print(f"Deleting {self.dev_name}")
                 run('sudo', 'losetup', '-d', self.dev_name)
-            print("Unmounting tmpfs from %s" % (self.tmp_dir))
+            print(f"Unmounting tmpfs from {self.tmp_dir}")
             umount(self.tmp_dir)
             os.rmdir(self.tmp_dir)