diff --git a/pyproject.toml b/pyproject.toml
index 0063d665..88dbcdbd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ dependencies = [
     # work cross-platform.
     "tzdata>=2026.3",
     # Observability
-    "prometheus-client>=0.20.0",
+    "prometheus-client>=0.26.0",
     # Reference-data pipeline: parse MediaWiki wikitext from EQ2i for the
     # raid-strategies feature. Used by scripts/dev/scrape_eq2i_raids.py
     # and backend/census/wikitext_md.py (the wikitext→markdown converter).
diff --git a/uv.lock b/uv.lock
index f5c6ed27..1e6c87fe 100644
--- a/uv.lock
+++ b/uv.lock
@@ -324,7 +324,7 @@ requires-dist = [
     { name = "itsdangerous", specifier = ">=2.2.0" },
     { name = "mwparserfromhell", specifier = ">=0.6.0" },
     { name = "pillow", specifier = ">=10.0.0" },
-    { name = "prometheus-client", specifier = ">=0.20.0" },
+    { name = "prometheus-client", specifier = ">=0.26.0" },
     { name = "python-dotenv", specifier = ">=1.0.0" },
     { name = "python-multipart", specifier = ">=0.0.9" },
     { name = "slowapi", specifier = ">=0.1.9" },
@@ -724,11 +724,11 @@ wheels = [
 
 [[package]]
 name = "prometheus-client"
-version = "0.25.0"
+version = "0.26.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/1b/fb/d9aa83ffe43ce1f19e557c0971d04b90561b0cfd50762aafb01968285553/prometheus_client-0.25.0.tar.gz", hash = "sha256:5e373b75c31afb3c86f1a52fa1ad470c9aace18082d39ec0d2f918d11cc9ba28", size = 86035, upload-time = "2026-04-09T19:53:42.359Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/52/73/f1334c29c2af4cd9dba6c7817e61b611bd0215e2eb5565c6064a4de18802/prometheus_client-0.26.0.tar.gz", hash = "sha256:04a91bcf94e2cf74a44a1a874d651a2e853ed354b6e822f3b7487751465d5c2b", size = 92910, upload-time = "2026-07-24T19:36:41.893Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/8d/9b/d4b1e644385499c8346fa9b622a3f030dce14cd6ef8a1871c221a17a67e7/prometheus_client-0.25.0-py3-none-any.whl", hash = "sha256:d5aec89e349a6ec230805d0df882f3807f74fd6c1a2fa86864e3c2279059fed1", size = 64154, upload-time = "2026-04-09T19:53:41.324Z" },
+    { url = "https://files.pythonhosted.org/packages/eb/a3/b69efbf4143b5b9859b977770bbbabcc2796b702fa69dc40271e45cd5a56/prometheus_client-0.26.0-py3-none-any.whl", hash = "sha256:fa93d06737aa02bacd05794768508bb97d2fbee28cb3bca04eaae92f0ca953d6", size = 64494, upload-time = "2026-07-24T19:36:40.854Z" },
 ]
 
 [[package]]