diff --git a/changelog.d/update-policyengine-bundle-4.21.0.changed.md b/changelog.d/update-policyengine-bundle-4.21.0.changed.md
new file mode 100644
index 000000000..132d19046
--- /dev/null
+++ b/changelog.d/update-policyengine-bundle-4.21.0.changed.md
@@ -0,0 +1 @@
+Update the PolicyEngine bundle to 4.21.0.
diff --git a/pyproject.toml b/pyproject.toml
index a9c0e2ba8..9a59fa71d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ dependencies = [
     "policyengine_canada==0.96.3",
     "policyengine-ng==0.5.1",
     "policyengine-il==0.1.0",
-    "policyengine[models]==4.20.3",
+    "policyengine[models]==4.21.0",
     "pydantic",
     "pymysql",
     "python-dotenv",
diff --git a/uv.lock b/uv.lock
index cb686f5dd..ca79f1df1 100644
--- a/uv.lock
+++ b/uv.lock
@@ -2588,7 +2588,7 @@ wheels = [
 
 [[package]]
 name = "policyengine"
-version = "4.20.3"
+version = "4.21.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "diskcache" },
@@ -2602,9 +2602,9 @@ 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.optional-dependencies]
@@ -2616,7 +2616,7 @@ models = [
 
 [[package]]
 name = "policyengine-api"
-version = "3.45.0"
+version = "3.45.1"
 source = { editable = "." }
 dependencies = [
     { name = "a2wsgi" },
@@ -2683,7 +2683,7 @@ requires-dist = [
     { name = "markupsafe", specifier = ">=3,<4" },
     { name = "microdf-python", specifier = ">=1.0.0" },
     { name = "openai" },
-    { name = "policyengine", extras = ["models"], specifier = "==4.20.3" },
+    { name = "policyengine", extras = ["models"], specifier = "==4.21.0" },
     { name = "policyengine-canada", specifier = "==0.96.3" },
     { name = "policyengine-il", specifier = "==0.1.0" },
     { name = "policyengine-ng", specifier = "==0.5.1" },