diff --git a/poetry.lock b/poetry.lock
index 8db16df..89c5a9e 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1019,15 +1019,22 @@ files = [
 
 [[package]]
 name = "sphinx-notfound-page"
-version = "0.8"
+version = "1.0.2"
 description = "Sphinx extension to build a 404 page with absolute URLs"
 optional = false
-python-versions = "*"
+python-versions = ">=3.8"
 files = [
-    {file = "sphinx-notfound-page-0.8.tar.gz", hash = "sha256:39bf5b99e1fbf6164631ecac2b58038f08e0ab9278c563076aadd1cf04b6bb7a"},
-    {file = "sphinx_notfound_page-0.8-py3-none-any.whl", hash = "sha256:1901e01df9931922e87ef1f967042322b06a65790132cbd393861261e023b974"},
+    {file = "sphinx_notfound_page-1.0.2-py3-none-any.whl", hash = "sha256:dbfb4fb05d8ccdaf28c19c3452231eeab73917fd475dcafebbf3babb84343800"},
+    {file = "sphinx_notfound_page-1.0.2.tar.gz", hash = "sha256:7b2759ca79cbaa44422325f540b91542b1ce411cd31217c20cd6ba1e6cffb5ec"},
 ]
 
+[package.dependencies]
+sphinx = ">=5"
+
+[package.extras]
+doc = ["sphinx-autoapi", "sphinx-rtd-theme", "sphinx-tabs", "sphinxemoji"]
+test = ["tox"]
+
 [[package]]
 name = "sphinx-rtd-theme"
 version = "2.0.0"
@@ -1521,4 +1528,4 @@ test = ["pytest"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "332f54447193814f64fa55f63299f5d4cd72d0838cbbde778c099a178a99cf26"
+content-hash = "86967fd3d953796629bd06eb1a82117dd97cdf21c30f57753901d709b0e5ef93"
diff --git a/pyproject.toml b/pyproject.toml
index f74376e..672a60b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ latex = "==0.7.0"
 packaging = "==24.1"
 sphinx = "==7.3.7"
 sphinx-hoverxref = "==1.0.1"
-sphinx-notfound-page = "==0.8.0"
+sphinx-notfound-page = "==1.0.2"
 sphinx-rtd-theme = "==2.0.0"
 sphinx-tabs = "==3.4.5"
 sphinx-version-warning = "==1.1.2"
diff --git a/source/conf.py b/source/conf.py
index fab734e..690834c 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -104,7 +104,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = 'en'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
diff --git a/source/requirements.txt b/source/requirements.txt
index 6af77d9..1271c18 100644
--- a/source/requirements.txt
+++ b/source/requirements.txt
@@ -37,7 +37,7 @@ six==1.16.0 ; python_version >= "3.9" and python_version < "4.0"
 smmap==5.0.1 ; python_version >= "3.9" and python_version < "4.0"
 snowballstemmer==2.2.0 ; python_version >= "3.9" and python_version < "4.0"
 sphinx-hoverxref==1.0.1 ; python_version >= "3.9" and python_version < "4.0"
-sphinx-notfound-page==0.8 ; python_version >= "3.9" and python_version < "4.0"
+sphinx-notfound-page==1.0.2 ; python_version >= "3.9" and python_version < "4.0"
 sphinx-rtd-theme==2.0.0 ; python_version >= "3.9" and python_version < "4.0"
 sphinx-tabs==3.4.5 ; python_version >= "3.9" and python_version < "4.0"
 sphinx-version-warning==1.1.2 ; python_version >= "3.9" and python_version < "4.0"