diff --git a/dangerzone/conversion/errors.py b/dangerzone/conversion/errors.py
index 6bb5ec1..007caea 100644
--- a/dangerzone/conversion/errors.py
+++ b/dangerzone/conversion/errors.py
@@ -78,12 +78,12 @@ class MaxPagesException(PagesException):
 
 class MaxPageWidthException(PagesException):
     error_code = ERROR_SHIFT + 44
-    error_message = f"A page exceeded the maximum width."
+    error_message = "A page exceeded the maximum width."
 
 
 class MaxPageHeightException(PagesException):
     error_code = ERROR_SHIFT + 45
-    error_message = f"A page exceeded the maximum height."
+    error_message = "A page exceeded the maximum height."
 
 
 class PageCountMismatch(PagesException):
diff --git a/dangerzone/gui/main_window.py b/dangerzone/gui/main_window.py
index 9e04e44..acc9b96 100644
--- a/dangerzone/gui/main_window.py
+++ b/dangerzone/gui/main_window.py
@@ -824,7 +824,7 @@ class SettingsWidget(QtWidgets.QWidget):
 
         if n_docs == 1:
             self.start_button.setText("Convert to Safe Document")
-            self.docs_selected_label.setText(f"1 document selected")
+            self.docs_selected_label.setText("1 document selected")
         else:
             self.start_button.setText("Convert to Safe Documents")
             self.docs_selected_label.setText(f"{n_docs} documents selected")
diff --git a/dangerzone/gui/updater.py b/dangerzone/gui/updater.py
index 58279a8..21bb459 100644
--- a/dangerzone/gui/updater.py
+++ b/dangerzone/gui/updater.py
@@ -206,7 +206,7 @@ class UpdaterThread(QtCore.QThread):
         current_time = self._get_now_timestamp()
         last_check = self.dangerzone.settings.get("updater_last_check")
         if current_time < last_check + UPDATE_CHECK_COOLDOWN_SECS:
-            log.debug(f"Cooling down update checks")
+            log.debug("Cooling down update checks")
             return True
         else:
             return False
@@ -255,10 +255,10 @@ class UpdaterThread(QtCore.QThread):
            previous run.
         2. In GitHub, by hitting the latest releases API.
         """
-        log.debug(f"Checking for Dangerzone updates")
+        log.debug("Checking for Dangerzone updates")
         latest_version = self.dangerzone.settings.get("updater_latest_version")
         if version.parse(get_version()) < version.parse(latest_version):
-            log.debug(f"Determined that there is an update due to cached results")
+            log.debug("Determined that there is an update due to cached results")
             return UpdateReport(
                 version=latest_version,
                 changelog=self.dangerzone.settings.get("updater_latest_changelog"),
@@ -275,7 +275,7 @@ class UpdaterThread(QtCore.QThread):
                 "updater_last_check", self._get_now_timestamp(), autosave=True
             )
 
-        log.debug(f"Checking the latest GitHub release")
+        log.debug("Checking the latest GitHub release")
         report = self.get_latest_info()
         log.debug(f"Latest version in GitHub is {report.version}")
         if report.version and self.can_update(latest_version, report.version):
@@ -285,7 +285,7 @@ class UpdaterThread(QtCore.QThread):
             )
             return report
 
-        log.debug(f"No need to update")
+        log.debug("No need to update")
         return UpdateReport()
 
     ##################
diff --git a/dev_scripts/upload-asset.py b/dev_scripts/upload-asset.py
index cfcc31e..1b7fce9 100755
--- a/dev_scripts/upload-asset.py
+++ b/dev_scripts/upload-asset.py
@@ -83,16 +83,16 @@ def main():
     )
     parser.add_argument(
         "--tag",
-        help=f"use the release with this tag",
+        help="use the release with this tag",
     )
     parser.add_argument(
         "--release-id",
-        help=f"use the release with this ID",
+        help="use the release with this ID",
     )
     parser.add_argument(
         "--draft",
         action="store_true",
-        help=f"use the latest draft release",
+        help="use the latest draft release",
     )
     parser.add_argument(
         "file",
@@ -116,7 +116,7 @@ def main():
     elif args.release_id:
         release_id = args.release_id
     else:
-        log.debug(f"Getting the ID of the latest draft release")
+        log.debug("Getting the ID of the latest draft release")
         release_id = get_latest_draft_release(token)
         log.debug(f"The latest draft release has ID '{release_id}'")
 
diff --git a/qubes/dz.ConvertDev b/qubes/dz.ConvertDev
index a5b7a5b..31ca897 100755
--- a/qubes/dz.ConvertDev
+++ b/qubes/dz.ConvertDev
@@ -19,7 +19,7 @@ def main():
     # Read the zipfile from stdin
     zf = sys.stdin.buffer.read(size)
     if len(zf) < size:
-        say(f"Client closed the connection early")
+        say("Client closed the connection early")
         return 1
 
     with tempfile.NamedTemporaryFile(suffix=".zip") as t:
@@ -27,10 +27,11 @@ def main():
         t.write(zf)
         t.flush()
 
-        say(f"Importing the conversion module")
+        say("Importing the conversion module")
         sys.path.insert(0, t.name)
 
         from dangerzone.conversion.doc_to_pixels import main
+
         return asyncio.run(main())
 
 
diff --git a/tests/isolation_provider/test_qubes.py b/tests/isolation_provider/test_qubes.py
index b05049f..f876369 100644
--- a/tests/isolation_provider/test_qubes.py
+++ b/tests/isolation_provider/test_qubes.py
@@ -56,7 +56,7 @@ class QubesWait(Qubes):
                     return proc
             time.sleep(0.1)
 
-        raise RuntimeError(f"Disposable qube did not start within 30 seconds")
+        raise RuntimeError("Disposable qube did not start within 30 seconds")
 
 
 @pytest.fixture