diff --git a/pyproject.toml b/pyproject.toml
index 39ba29ed..fcc2f5d8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools==82.0.1"]
+requires = ["setuptools==84.1.0"]
 build-backend = "setuptools.build_meta"
 
 [project]
diff --git a/requirements.build.lock.txt b/requirements.build.lock.txt
index abed9c3f..4dceeccc 100644
--- a/requirements.build.lock.txt
+++ b/requirements.build.lock.txt
@@ -1,4 +1,5 @@
 # CounterLab runner build tools, resolved for Python 3.13.
 # Install with: pip install --require-hashes --only-binary=:all: -r requirements.build.lock.txt
-setuptools==82.0.1 \
-    --hash=sha256:a59e362652f08dcd477c78bb6e7bd9d80a7995bc73ce773050228a348ce2e5bb
+setuptools==84.1.0 \
+    --hash=sha256:23657205b63d4d31395ab917815247f694aafad28cd21316bf5fd45a51048ea0 \
+    --hash=sha256:5231689c6ac8156cd155cfb98c3fd6fb252c3e7e9bd3d78b64d3c55f132624c9
diff --git a/services/runner/pyproject.toml b/services/runner/pyproject.toml
index ea96629f..fbc97e0f 100644
--- a/services/runner/pyproject.toml
+++ b/services/runner/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools==82.0.1"]
+requires = ["setuptools==84.1.0"]
 build-backend = "setuptools.build_meta"
 
 [project]