diff --git a/projects/policyengine-simulation-executor/pyproject.toml b/projects/policyengine-simulation-executor/pyproject.toml
index 1041981ac..4b5e3e81c 100644
--- a/projects/policyengine-simulation-executor/pyproject.toml
+++ b/projects/policyengine-simulation-executor/pyproject.toml
@@ -18,7 +18,7 @@ dependencies = [
     "policyengine-fastapi",
     "policyengine-simulation-observability",
     "policyengine-simulation-contract",
-    "policyengine==4.20.3",
+    "policyengine==4.21.0",
     "policyengine-core==3.28.0",
     "policyengine-uk==2.89.2",
     "policyengine-us==1.764.6",
diff --git a/projects/policyengine-simulation-executor/uv.lock b/projects/policyengine-simulation-executor/uv.lock
index 32819c27b..e6afcb50c 100644
--- a/projects/policyengine-simulation-executor/uv.lock
+++ b/projects/policyengine-simulation-executor/uv.lock
@@ -1718,7 +1718,7 @@ wheels = [
 
 [[package]]
 name = "policyengine"
-version = "4.20.3"
+version = "4.21.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "diskcache" },
@@ -1732,9 +1732,9 @@ dependencies = [
     { name = "pydantic" },
     { name = "requests" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/ad/fd/5271ee51d1f1a2c2c84841bd3fae37118258febdb59c156b5c268adf96de/policyengine-4.20.3.tar.gz", hash = "sha256:1d4741fd631ca160cf29da4ae31480842d973b130e341adadb798c115a92cd00", size = 724947, upload-time = "2026-07-09T20:16:52.094Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/28/ac/70d564870045457092cdaff4a5f096a8717d3fc4b9cb7ea02fb6f4f1dad7/policyengine-4.21.0.tar.gz", hash = "sha256:7ea8f404244844712b8d8048f17db65fbe311f82f1bf50d752ab2c2c391494c5", size = 730004, upload-time = "2026-07-12T18:19:34.211Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/e7/ce/1a2f5d6fe059d5521368585fc0b1ccb1428735a85065716bc3219509879f/policyengine-4.20.3-py3-none-any.whl", hash = "sha256:dc46f803c42550e9c9b99aed7e64c728c30b90ca4826ee18160a4f4feccbffd9", size = 221895, upload-time = "2026-07-09T20:16:50.52Z" },
+    { url = "https://files.pythonhosted.org/packages/c7/e6/3cfd5a8128e7518a2c37de6df90a3b24f74dfdbb316f02404270147cb8bc/policyengine-4.21.0-py3-none-any.whl", hash = "sha256:e1db35c916a39d352abbfb7a00c32a57d9ee02e8a19574fedb776a3ff0a90659", size = 222613, upload-time = "2026-07-12T18:19:32.978Z" },
 ]
 
 [[package]]
@@ -1903,7 +1903,7 @@ requires-dist = [
     { name = "openapi-python-client", marker = "extra == 'build'", specifier = ">=0.21.6" },
     { name = "opentelemetry-instrumentation-fastapi", specifier = ">=0.51b0,<0.52" },
     { name = "opentelemetry-instrumentation-sqlalchemy", specifier = ">=0.51b0,<0.52" },
-    { name = "policyengine", specifier = "==4.20.3" },
+    { name = "policyengine", specifier = "==4.21.0" },
     { name = "policyengine-core", specifier = "==3.28.0" },
     { name = "policyengine-fastapi", editable = "../../libs/policyengine-fastapi" },
     { name = "policyengine-observability", extras = ["fastapi"], specifier = ">=1.3.0,<2" },