diff --git a/pyproject.toml b/pyproject.toml
index 002a7d2b0..f2e3a88b7 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==23.2.7",
+    "idc-index-data==23.4.1",
     "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 b65f5f8f5..a1d46b190 100644
--- a/uv.lock
+++ b/uv.lock
@@ -175,7 +175,7 @@ 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 = "==23.2.7" },
+    { name = "idc-index-data", specifier = "==23.4.1" },
     { 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" },
@@ -2533,14 +2533,14 @@ wheels = [
 
 [[package]]
 name = "idc-index-data"
-version = "23.2.7"
+version = "23.4.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "google-cloud-bigquery" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/75/ef/19561fcbf3275363216ba0b3d22d1933c00dd4ede31dc358636f97585104/idc_index_data-23.2.7.tar.gz", hash = "sha256:eae08cd824a22d8036b538c2e90a5d4864f2df7d94511cb3067d87e55ad3a005", size = 85316444, upload-time = "2026-01-05T18:12:49.397Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/b5/0a/362f86595933dde2ed767b34a10c95db8880caa227e0400226753a03ceb8/idc_index_data-23.4.1.tar.gz", hash = "sha256:1781dff256bf358c13db92ce1177f8287ad47b4f16c25dac1bba6d7212362a53", size = 85426584, upload-time = "2026-02-05T21:58:53.768Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/ad/23/c4d2e2d465d0f8a3339a4e5b2b340a1e85ff7f5e071a4f852c3d702ea65e/idc_index_data-23.2.7-py3-none-any.whl", hash = "sha256:bb6874a69abb43857d664fd5904bc5cbc85035341dab18bbb518dae6496c2f6a", size = 85299983, upload-time = "2026-01-05T18:12:43.565Z" },
+    { url = "https://files.pythonhosted.org/packages/33/7d/a5c939e8ddd87e3d89a0ee5bb1c8b458cf7ef3607dcccbb41fdf5b1643d3/idc_index_data-23.4.1-py3-none-any.whl", hash = "sha256:8fc2391a752b92ea40657e33d9bb7c8911430151f9174cf57d7bcb467fc00eab", size = 85411318, upload-time = "2026-02-05T21:58:49.551Z" },
 ]
 
 [[package]]