diff --git a/android/pyproject.toml b/android/pyproject.toml
index 071b35f064..220ded5dec 100644
--- a/android/pyproject.toml
+++ b/android/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==70.3.0",
+    "setuptools==71.1.0",
     "setuptools_scm==8.1.0",
     "setuptools_dynamic_dependencies @ git+https://github.com/beeware/setuptools_dynamic_dependencies",
 ]
diff --git a/changes/2724.misc.rst b/changes/2724.misc.rst
new file mode 100644
index 0000000000..08cd276c7e
--- /dev/null
+++ b/changes/2724.misc.rst
@@ -0,0 +1 @@
+The pinned dependencies in pyproject.toml and tox.ini were updated to their latest versions.
diff --git a/cocoa/pyproject.toml b/cocoa/pyproject.toml
index 770af306b0..62e45fa1ff 100644
--- a/cocoa/pyproject.toml
+++ b/cocoa/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==70.3.0",
+    "setuptools==71.1.0",
     "setuptools_scm==8.1.0",
     "setuptools_dynamic_dependencies @ git+https://github.com/beeware/setuptools_dynamic_dependencies",
 ]
diff --git a/core/pyproject.toml b/core/pyproject.toml
index e864e55c74..f91ce69017 100644
--- a/core/pyproject.toml
+++ b/core/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==70.3.0",
+    "setuptools==71.1.0",
     "setuptools_scm==8.1.0",
     "setuptools_dynamic_dependencies @ git+https://github.com/beeware/setuptools_dynamic_dependencies",
 ]
diff --git a/demo/pyproject.toml b/demo/pyproject.toml
index fca65f38d5..8daa0fcf19 100644
--- a/demo/pyproject.toml
+++ b/demo/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==70.3.0",
+    "setuptools==71.1.0",
     "setuptools_scm==8.1.0",
     "setuptools_dynamic_dependencies @ git+https://github.com/beeware/setuptools_dynamic_dependencies",
 ]
diff --git a/dummy/pyproject.toml b/dummy/pyproject.toml
index 3ba9d709dc..4282a7573d 100644
--- a/dummy/pyproject.toml
+++ b/dummy/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==70.3.0",
+    "setuptools==71.1.0",
     "setuptools_scm==8.1.0",
     "setuptools_dynamic_dependencies @ git+https://github.com/beeware/setuptools_dynamic_dependencies",
 ]
diff --git a/gtk/pyproject.toml b/gtk/pyproject.toml
index b4dbd56f16..c3e38939c1 100644
--- a/gtk/pyproject.toml
+++ b/gtk/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==70.3.0",
+    "setuptools==71.1.0",
     "setuptools_scm==8.1.0",
     "setuptools_dynamic_dependencies @ git+https://github.com/beeware/setuptools_dynamic_dependencies",
 ]
diff --git a/iOS/pyproject.toml b/iOS/pyproject.toml
index 55f8cc0bf6..c729057c4a 100644
--- a/iOS/pyproject.toml
+++ b/iOS/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==70.3.0",
+    "setuptools==71.1.0",
     "setuptools_scm==8.1.0",
     "setuptools_dynamic_dependencies @ git+https://github.com/beeware/setuptools_dynamic_dependencies",
 ]
diff --git a/textual/pyproject.toml b/textual/pyproject.toml
index ebe06c61bc..2b0e36bdaf 100644
--- a/textual/pyproject.toml
+++ b/textual/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==70.3.0",
+    "setuptools==71.1.0",
     "setuptools_scm==8.1.0",
     "setuptools_dynamic_dependencies @ git+https://github.com/beeware/setuptools_dynamic_dependencies",
 ]
diff --git a/toga/pyproject.toml b/toga/pyproject.toml
index b459935a71..1cde85d59c 100644
--- a/toga/pyproject.toml
+++ b/toga/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==70.3.0",
+    "setuptools==71.1.0",
     "setuptools_scm==8.1.0",
     "setuptools_dynamic_dependencies @ git+https://github.com/beeware/setuptools_dynamic_dependencies",
 ]
diff --git a/web/pyproject.toml b/web/pyproject.toml
index 402ef51e05..06f9e6ece5 100644
--- a/web/pyproject.toml
+++ b/web/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==70.3.0",
+    "setuptools==71.1.0",
     "setuptools_scm==8.1.0",
     "setuptools_dynamic_dependencies @ git+https://github.com/beeware/setuptools_dynamic_dependencies",
 ]
diff --git a/winforms/pyproject.toml b/winforms/pyproject.toml
index 8796dfe152..44f226e4d3 100644
--- a/winforms/pyproject.toml
+++ b/winforms/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools==70.3.0",
+    "setuptools==71.1.0",
     "setuptools_scm==8.1.0",
     "setuptools_dynamic_dependencies @ git+https://github.com/beeware/setuptools_dynamic_dependencies",
 ]