diff --git a/lobster/common/io.py b/lobster/common/io.py
index a8adfad1..ba78d418 100644
--- a/lobster/common/io.py
+++ b/lobster/common/io.py
@@ -101,8 +101,8 @@ def lobster_read(
         mh.error(loc, f"unknown schema kind {data['schema']}")
     if data["version"] not in supported_schema[data["schema"]]:
         mh.error(loc,
-                 "version %u for schema %s is not supported" %
-                 (data["version"], data["schema"]))
+                 f"version {data['version']} for schema "
+                 f"{data['schema']} is not supported")
 
     duplicate_items = []
     # Convert to items, and integrate into symbol table
diff --git a/lobster/common/items.py b/lobster/common/items.py
index c29fc2d4..bfbcc8a9 100644
--- a/lobster/common/items.py
+++ b/lobster/common/items.py
@@ -161,8 +161,8 @@ def determine_status(self, config, stab):
                 if not any(has_trace[src] for src in chain) and \
                    not has_just_down:
                     ok_down = False
-                    self.messages.append("missing reference to %s" %
-                                         " or ".join(sorted(chain)))
+                    chain_str = " or ".join(sorted(chain))
+                    self.messages.append(f"missing reference to {chain_str}")
 
         # Set status
         if self.has_error:
diff --git a/lobster/common/parser.py b/lobster/common/parser.py
index 183648e8..5cf1dcc4 100644
--- a/lobster/common/parser.py
+++ b/lobster/common/parser.py
@@ -83,7 +83,7 @@ def parse(self):
             else:
                 self.error(self.nt.loc,
                            "expected: requirements|implementation|activity,"
-                           " found %s instead" % self.nt.value())
+                           f" found {self.nt.value()} instead")
 
         return self.levels
 
diff --git a/lobster/common/report.py b/lobster/common/report.py
index 89bb06ba..4e27853b 100644
--- a/lobster/common/report.py
+++ b/lobster/common/report.py
@@ -90,14 +90,13 @@ def resolve_references_for_items(self):
                 # Check versions match, if specified
                 if dst_tag.version is not None:
                     if dst_item.tag.version is None:
-                        src_item.error("tracing destination %s is unversioned"
-                                       % dst_tag.key())
+                        src_item.error(
+                            f"tracing destination {dst_tag.key()} is unversioned"
+                        )
                     elif dst_tag.version != dst_item.tag.version:
-                        src_item.error("tracing destination %s has version %s"
-                                       " (expected %s)" %
-                                       (dst_tag.key(),
-                                        dst_item.tag.version,
-                                        dst_tag.version))
+                        msg = (f"tracing destination {dst_tag.key()} has version "
+                               f"{dst_item.tag.version} (expected {dst_tag.version})")
+                        src_item.error(msg)
 
     def compute_coverage_for_items(self):
         for level_obj in self.coverage.values():
@@ -237,8 +236,8 @@ def validate_indicated_schema(self, data, loc):
             self.mh.error(loc, f"unknown schema kind {data['schema']}")
         if data["version"] not in supported_schema[data["schema"]]:
             self.mh.error(loc,
-                          "version %u for schema %s is not supported" %
-                          (data["version"], data["schema"]))
+                          f"version {data['version']} for schema "
+                          f"{data['schema']} is not supported")
 
     def validate_basic_structure_of_lobster_file(self, data, loc):
         """
diff --git a/lobster/htmldoc/htmldoc.py b/lobster/htmldoc/htmldoc.py
index 0c00aa9e..c9748f15 100644
--- a/lobster/htmldoc/htmldoc.py
+++ b/lobster/htmldoc/htmldoc.py
@@ -129,9 +129,11 @@ def generate(self, doc) -> List[str]:
         }
 
         rv = ['<div class="dropdown">']
-        rv.append('<button class="dropbtn">%s%s</button>' %
-                  (html.escape(self.name),
-                   '<svg class="icon"><use href="#svg-chevron-down"></use></svg>'))
+        rv.append(
+            f'<button class="dropbtn">{html.escape(self.name)}'
+            '<svg class="icon"><use href="#svg-chevron-down"></use></svg>'
+            '</button>'
+        )
         rv.append('<div class="dropdown-content">')
         for item in self.items:
             rv += item.generate(doc)
diff --git a/lobster/tools/codebeamer/codebeamer.py b/lobster/tools/codebeamer/codebeamer.py
index 53f3b73b..85dce376 100755
--- a/lobster/tools/codebeamer/codebeamer.py
+++ b/lobster/tools/codebeamer/codebeamer.py
@@ -200,9 +200,9 @@ def get_many_items(cb_config: Config, item_ids: Iterable[int]):
                          f"({','.join(str(item_id) for item_id in item_ids)})")
 
     while True:
-        base_url = "%s/items/query?page=%u&pageSize=%u&queryString=%s"\
-                   % (cb_config.base, page_id,
-                      cb_config.page_size, query_string)
+        base_url = (f"{cb_config.base}/items/query?page={page_id}"
+                    f"&pageSize={cb_config.page_size}"
+                    f"&queryString={query_string}")
         data = query_cb_single(cb_config, base_url)
         rv += data["items"]
         if len(rv) == data["total"]:
@@ -224,19 +224,13 @@ def get_query(cb_config: Config, query: Union[int, str]):
     total_items = None
 
     while total_items is None or len(rv) < total_items:
-        print("Fetching page %u of query..." % page_id)
+        print(f"Fetching page {page_id} of query...")
         if isinstance(query, int):
-            url = ("%s/reports/%u/items?page=%u&pageSize=%u" %
-                    (cb_config.base,
-                        query,
-                        page_id,
-                        cb_config.page_size))
+            url = (f"{cb_config.base}/reports/{query}/items"
+                   f"?page={page_id}&pageSize={cb_config.page_size}")
         elif isinstance(query, str):
-            url = ("%s/items/query?page=%u&pageSize=%u&queryString=%s" %
-                    (cb_config.base,
-                        page_id,
-                        cb_config.page_size,
-                        query))
+            url = (f"{cb_config.base}/items/query?page={page_id}"
+                   f"&pageSize={cb_config.page_size}&queryString={query}")
         data = query_cb_single(cb_config, url)
         if len(data) != 4:
             raise MismatchException(
diff --git a/lobster/tools/core/html_report/html_report.py b/lobster/tools/core/html_report/html_report.py
index 6a74e3fe..623486cf 100755
--- a/lobster/tools/core/html_report/html_report.py
+++ b/lobster/tools/core/html_report/html_report.py
@@ -151,18 +151,18 @@ def create_item_coverage(doc, report):
         doc.add_line(
             f'<tr class="coverage-table-{level.name.replace(" ", "-").lower()}">'
         )
-        doc.add_line('<td><a href="#sec-%s">%s</a></td>' %
-                     (name_hash(level.name),
-                      html.escape(level.name)))
+        doc.add_line(
+            f'<td><a href="#sec-{name_hash(level.name)}">'
+            f'{html.escape(level.name)}</a></td>'
+        )
         doc.add_line(f"<td>{data.coverage:.1f}%</td>")
         doc.add_line("<td>")
-        doc.add_line('<progress value="%u" max="%u">' %
-                     (data.ok, data.items))
+        doc.add_line(f'<progress value="{data.ok}" max="{data.items}">')
         doc.add_line(f"{data.coverage:.2f}%")
         doc.add_line('</progress>')
         doc.add_line("</td>")
-        doc.add_line('<td align="right">%u</td>' % data.ok)
-        doc.add_line('<td align="right">%u</td>' % data.items)
+        doc.add_line(f'<td align="right">{data.ok}</td>')
+        doc.add_line(f'<td align="right">{data.items}</td>')
         doc.add_line("</tr>")
     doc.add_line("</table>")
 
@@ -205,12 +205,13 @@ def write_item_box_begin(doc, item, report):
     doc.add_line(f'<div class="item-{html.escape(item.tracing_status.name.lower())}" '
                  f'id="item-{item.tag.hash()}">')
 
-    doc.add_line('<div class="item-name">%s %s</div>' %
-                 ('<svg class="icon"><use href="#svg-check-square"></use></svg>'
-                  if item.tracing_status in (Tracing_Status.OK,
-                                             Tracing_Status.JUSTIFIED)
-                  else '<svg class="icon"><use href="#svg-alert-triangle"></use></svg>',
-                  xref_item(item, link=False)))
+    svg_icon = (
+        '<svg class="icon"><use href="#svg-check-square"></use></svg>'
+        if item.tracing_status in (Tracing_Status.OK, Tracing_Status.JUSTIFIED)
+        else '<svg class="icon"><use href="#svg-alert-triangle"></use></svg>'
+    )
+    item_div_content = f'{svg_icon} {xref_item(item, link=False)}'
+    doc.add_line(f'<div class="item-name">{item_div_content}</div>')
 
     doc.add_line('<div class="attribute">Source: ')
     doc.add_line('<svg class="icon"><use href="#svg-external-link"></use></svg>')
@@ -533,9 +534,10 @@ def write_html(report, dot, high_contrast, render_md) -> str:
                                                     Github_Reference)):
                         new_file_heading = item.location.filename
                     elif isinstance(item.location, Codebeamer_Reference):
-                        new_file_heading = "Codebeamer %s, tracker %u" % \
-                            (item.location.cb_root,
-                             item.location.tracker)
+                        new_file_heading = (
+                            f"Codebeamer {item.location.cb_root},"
+                            f" tracker {item.location.tracker}"
+                        )
                     else:  # pragma: no cover
                         assert False
                     if new_file_heading != file_heading:
diff --git a/lobster/tools/cpptest/constants.py b/lobster/tools/cpptest/constants.py
index 60134a1b..119cee2e 100644
--- a/lobster/tools/cpptest/constants.py
+++ b/lobster/tools/cpptest/constants.py
@@ -6,9 +6,10 @@ def __init__(self, codebeamer_url = ''):
 
         self.codebeamer_link = codebeamer_url + "/issue/"
         self.requirement = re.compile(r'@requirement[\s\S]*?(?=@|\Z)')
-        self.requirement_tag_http = ((r"([@\\]requirement(\s+"
-                                      r"(CB-#\d+\s+)*({}\d+\s*,?\s*/*\*?)+)+)")
-                                     .format(self.codebeamer_link))
+        self.requirement_tag_http = (
+            rf"([@\\]requirement(\s+(CB-#\d+\s+)*"
+            rf"({self.codebeamer_link}\d+\s*,?\s*/*\*?)+)+)"
+        )
         self.requirement_tag_http_named = rf"({self.codebeamer_link}(?P<number>\d+))"
 
     NON_EXISTING_INFO = "---"
diff --git a/lobster/tools/python/python.py b/lobster/tools/python/python.py
index 566afc08..d2a7a7d9 100755
--- a/lobster/tools/python/python.py
+++ b/lobster/tools/python/python.py
@@ -155,17 +155,12 @@ def lobster_tag(self):
 
     def warn_ignored(self, reason):
         for tag in self.tags:
-            print("%s: warning: ignored tag %s because "
-                  "%s already has annotations" %
-                  (self.location.to_string(),
-                   tag,
-                   reason))
+            print(f"{self.location.to_string()}: warning: ignored tag {tag}"
+                  f" because {reason} already has annotations")
         for just in self.just:
-            print("%s: warning: ignored justification '%s' because "
-                  "%s already has annotations" %
-                  (self.location.to_string(),
-                   just,
-                   reason))
+            print(f"{self.location.to_string()}: warning: "
+                  f"ignored justification '{just}' "
+                  f"because {reason} already has annotations")
 
 
 class Python_Module(Python_Traceable_Node):
diff --git a/pylint3.cfg b/pylint3.cfg
index e2c37e70..7ea9fea0 100644
--- a/pylint3.cfg
+++ b/pylint3.cfg
@@ -10,8 +10,7 @@ disable=
  too-many-arguments,
  too-many-locals,
  too-many-statements,
- too-many-nested-blocks,
- consider-using-f-string
+ too-many-nested-blocks
 
 [REPORTS]
 output-format=text
diff --git a/util/bump_version_post_release.py b/util/bump_version_post_release.py
index 27f2b29f..2c485aa5 100644
--- a/util/bump_version_post_release.py
+++ b/util/bump_version_post_release.py
@@ -35,9 +35,7 @@
 with open(VERSION_FILE, encoding="UTF-8") as fd:
     for raw_line in fd:
         if raw_line.startswith("VERSION_TUPLE"):
-            raw_line = 'VERSION_TUPLE = (%u, %u, %u)\n' % (major,
-                                                           minor,
-                                                           release)
+            raw_line = f'VERSION_TUPLE = ({major}, {minor}, {release})\n'
         elif raw_line.startswith("VERSION_SUFFIX"):
             raw_line = 'VERSION_SUFFIX = "dev"\n'
 
@@ -45,7 +43,7 @@
 with open(VERSION_FILE, "w", encoding="UTF-8") as fd:
     fd.write(tmp)
 
-LOBSTER_VERSION = "%u.%u.%u-dev" % (major, minor, release)
+LOBSTER_VERSION = f"{major}.{minor}.{release}-dev"
 
 # Update changelog and docs, adding a new entry