diff --git a/pyproject.toml b/pyproject.toml
index d16c4226..a2395919 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -100,7 +100,7 @@ dependencies = [
     "highdicom>=0.26.1,<1; python_version < '3.14'", # transitive dependency pyjpegls not yet supporting Python 3.14
     "html-sanitizer>=2.6.0,<3",
     "httpx>=0.28.1,<1",
-    "idc-index-data==23.8.1",
+    "idc-index-data==23.9.0",
     "ijson>=3.4.0.post0,<4",
     "jsf>=0.11.2,<1",
     "jsonschema[format-nongpl]>=4.25.1,<5",
diff --git a/uv.lock b/uv.lock
index 81c436df..f45feb20 100644
--- a/uv.lock
+++ b/uv.lock
@@ -177,7 +177,7 @@ requires-dist = [
     { name = "html-sanitizer", specifier = ">=2.6.0,<3" },
     { name = "httpx", specifier = ">=0.28.1,<1" },
     { name = "humanize", specifier = ">=4.14.0,<5" },
-    { name = "idc-index-data", specifier = "==23.8.1" },
+    { name = "idc-index-data", specifier = "==23.9.0" },
     { name = "ijson", specifier = ">=3.4.0.post0,<4" },
     { name = "ipython", marker = "extra == 'marimo'", specifier = ">=9.8.0,<10" },
     { name = "jsf", specifier = ">=0.11.2,<1" },
@@ -2587,11 +2587,11 @@ wheels = [
 
 [[package]]
 name = "idc-index-data"
-version = "23.8.1"
+version = "23.9.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/cc/b2/25070363a5e71e4aa52714c57b9640a44d8738612610cd8e071f6c5c1ce7/idc_index_data-23.8.1.tar.gz", hash = "sha256:7f12311e3ac7faa058d5dc58e3b8c61d5e59d87933b15b915b16928ec57cdf43", size = 85397991, upload-time = "2026-03-10T17:45:30.455Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/99/42/a49145a49bcbe9d73d0bff0eec6e95947d2e90026ce47cd549e324d66d80/idc_index_data-23.9.0.tar.gz", hash = "sha256:d20b9f972246765df4fb88b7ef18eb917f7716f955d505fe2baae432a798a479", size = 90988017, upload-time = "2026-03-25T01:19:45.117Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/11/b2/57105e5e8ad95f92d30f81d5434d3db8ab7f383b8562f213f51912c6f30e/idc_index_data-23.8.1-py3-none-any.whl", hash = "sha256:d7813757ff3977bc4ace7ea041d71cb1204d95c16abb730745e85af1e46a8893", size = 85379061, upload-time = "2026-03-10T17:45:23.956Z" },
+    { url = "https://files.pythonhosted.org/packages/39/2f/258a16fc745978271e48d9282dcb721dc2aa279415335b5531514779fc42/idc_index_data-23.9.0-py3-none-any.whl", hash = "sha256:9c137dc960ceb2769f6379a07e1fd05d35792610db8e4f287247f6a63b9fffc5", size = 90965261, upload-time = "2026-03-25T01:19:39.737Z" },
 ]
 
 [[package]]