diff --git a/sphinxcontrib/confluencebuilder/util.py b/sphinxcontrib/confluencebuilder/util.py
index 2c47f436..07a9a487 100644
--- a/sphinxcontrib/confluencebuilder/util.py
+++ b/sphinxcontrib/confluencebuilder/util.py
@@ -79,12 +79,12 @@ def normalize_base_url(url):
         if url:
             # removing any trailing forward slash user provided
             if url.endswith('/'):
-                url = url[:-1]
+                url = url.removesuffix('/')
             # check for rest api prefix; strip and return if found
             if url.endswith(API_REST_V1):
-                url = url[:-len(API_REST_V1)]
+                url = url.removesuffix(API_REST_V1)
             if url.endswith(API_REST_V2):
-                url = url[:-len(API_REST_V2)]
+                url = url.removesuffix(API_REST_V2)
             # restore trailing forward flash
             elif not url.endswith('/'):
                 url += '/'
diff --git a/tox.ini b/tox.ini
index 43923381..cce5bb28 100644
--- a/tox.ini
+++ b/tox.ini
@@ -58,7 +58,7 @@ commands = {envpython} -m sphinx -M latexpdf . _build -E -a
 [testenv:pylint]
 deps =
     {[testenv]deps}
-    pylint: pylint==3.3.1
+    pylint: pylint==3.3.3
 commands =
     pylint \
     sphinxcontrib \
@@ -67,7 +67,7 @@ commands =
 [testenv:ruff]
 deps =
     {[testenv]deps}
-    ruff: ruff==0.8.1
+    ruff: ruff==0.9.2
 setenv =
     {[testenv]setenv}
     RUFF_CACHE_DIR={toxworkdir}/.ruff_cache
@@ -82,7 +82,7 @@ commands =
 deps =
     {[testenv]deps}
     -r{toxinidir}/requirements_types.txt
-    mypy
+    mypy: mypy==1.14.1
 commands =
     mypy \
     --explicit-package-bases \