diff --git a/requirements/dev.txt b/requirements/dev.txt
index 36d9657..7b4b15d 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -282,7 +282,7 @@ requests-oauthlib==1.1.0
     # via flask-oauthlib
 rich==14.2.0
     # via typer
-roman-numerals-py==3.1.0
+roman-numerals==3.1.0
     # via sphinx
 rstcheck==6.2.5
     # via -r requirements/docs.in
@@ -300,7 +300,7 @@ six==1.17.0
     #   python-dateutil
 snowballstemmer==3.0.1
     # via sphinx
-sphinx==8.2.3
+sphinx==9.0.0
     # via
     #   -r requirements/docs.in
     #   pallets-sphinx-themes
diff --git a/requirements/docs.in b/requirements/docs.in
index 9c8c495..a846e9b 100644
--- a/requirements/docs.in
+++ b/requirements/docs.in
@@ -1,6 +1,6 @@
 -r app.in
 Pallets-Sphinx-Themes~=2.0
-Sphinx~=8.0
+Sphinx~=9.0
 sphinx-issues~=5.0
 sphinxcontrib-log-cabinet~=1.0
 sphinx-tabs~=3.0
diff --git a/requirements/docs.txt b/requirements/docs.txt
index b6be903..ed7c047 100644
--- a/requirements/docs.txt
+++ b/requirements/docs.txt
@@ -209,7 +209,7 @@ requests-oauthlib==1.1.0
     # via flask-oauthlib
 rich==14.2.0
     # via typer
-roman-numerals-py==3.1.0
+roman-numerals==3.1.0
     # via sphinx
 rstcheck==6.2.5
     # via -r requirements/docs.in
@@ -227,7 +227,7 @@ six==1.17.0
     #   python-dateutil
 snowballstemmer==3.0.1
     # via sphinx
-sphinx==8.2.3
+sphinx==9.0.0
     # via
     #   -r requirements/docs.in
     #   pallets-sphinx-themes