diff --git a/requirements/broken-projects.in b/requirements/broken-projects.in
index 02d95f8b948..88727c713e5 100644
--- a/requirements/broken-projects.in
+++ b/requirements/broken-projects.in
@@ -1 +1 @@
-Pillow < 10  # https://github.com/blockdiag/sphinxcontrib-blockdiag/issues/26
+Pillow < 11  # https://github.com/blockdiag/sphinxcontrib-blockdiag/issues/26
diff --git a/requirements/constraints.txt b/requirements/constraints.txt
index cdaafe60ae2..6b4859e38b9 100644
--- a/requirements/constraints.txt
+++ b/requirements/constraints.txt
@@ -130,7 +130,7 @@ packaging==21.2
     #   gunicorn
     #   pytest
     #   sphinx
-pillow==9.5.0
+pillow==10.4.0
     # via
     #   -c requirements/broken-projects.in
     #   blockdiag
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 4d3a136e5ac..66a00a7eb2b 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -125,7 +125,7 @@ packaging==23.1
     #   gunicorn
     #   pytest
     #   sphinx
-pillow==9.5.0
+pillow==10.4.0
     # via
     #   -c requirements/broken-projects.in
     #   blockdiag
diff --git a/requirements/doc-spelling.txt b/requirements/doc-spelling.txt
index 9ee15189662..cc647da7401 100644
--- a/requirements/doc-spelling.txt
+++ b/requirements/doc-spelling.txt
@@ -40,7 +40,7 @@ markupsafe==2.1.3
     # via jinja2
 packaging==23.1
     # via sphinx
-pillow==9.5.0
+pillow==10.4.0
     # via
     #   -c requirements/broken-projects.in
     #   blockdiag
@@ -54,11 +54,10 @@ requests==2.31.0
     # via sphinx
 snowballstemmer==2.2.0
     # via sphinx
-sphinx==7.2.6
+sphinx==7.1.2
     # via
     #   -r requirements/doc.in
     #   sphinxcontrib-blockdiag
-    #   sphinxcontrib-serializinghtml
     #   sphinxcontrib-spelling
     #   sphinxcontrib-towncrier
 sphinxcontrib-applehelp==1.0.4
@@ -73,7 +72,7 @@ sphinxcontrib-jsmath==1.0.1
     # via sphinx
 sphinxcontrib-qthelp==1.0.3
     # via sphinx
-sphinxcontrib-serializinghtml==1.1.9
+sphinxcontrib-serializinghtml==1.1.5
     # via sphinx
 sphinxcontrib-spelling==8.0.0 ; platform_system != "Windows"
     # via -r requirements/doc-spelling.in
@@ -96,4 +95,6 @@ zipp==3.17.0
 
 # The following packages are considered to be unsafe in a requirements file:
 setuptools==68.0.0
-    # via blockdiag
+    # via
+    #   blockdiag
+    #   sphinx
diff --git a/requirements/doc.txt b/requirements/doc.txt
index d9e7fb0ad7f..1e619982a6a 100644
--- a/requirements/doc.txt
+++ b/requirements/doc.txt
@@ -40,7 +40,7 @@ markupsafe==2.1.3
     # via jinja2
 packaging==23.1
     # via sphinx
-pillow==9.5.0
+pillow==10.4.0
     # via
     #   -c requirements/broken-projects.in
     #   blockdiag
@@ -52,11 +52,10 @@ requests==2.31.0
     # via sphinx
 snowballstemmer==2.2.0
     # via sphinx
-sphinx==7.2.6
+sphinx==7.1.2
     # via
     #   -r requirements/doc.in
     #   sphinxcontrib-blockdiag
-    #   sphinxcontrib-serializinghtml
     #   sphinxcontrib-towncrier
 sphinxcontrib-applehelp==1.0.4
     # via sphinx
@@ -70,7 +69,7 @@ sphinxcontrib-jsmath==1.0.1
     # via sphinx
 sphinxcontrib-qthelp==1.0.3
     # via sphinx
-sphinxcontrib-serializinghtml==1.1.9
+sphinxcontrib-serializinghtml==1.1.5
     # via sphinx
 sphinxcontrib-towncrier==0.4.0a0
     # via -r requirements/doc.in
@@ -91,4 +90,6 @@ zipp==3.17.0
 
 # The following packages are considered to be unsafe in a requirements file:
 setuptools==68.0.0
-    # via blockdiag
+    # via
+    #   blockdiag
+    #   sphinx