diff --git a/Pipfile b/Pipfile
index c6bd18f4..6f3cf431 100644
--- a/Pipfile
+++ b/Pipfile
@@ -37,7 +37,7 @@ pytest-asyncio = "==0.23.8"
 # currently for design/experiments/store_mongo.py
 pymongo = "==4.8.0"
 sourmash = "==4.8.11"
-prometheus-client = "==0.20.0"
+prometheus-client = "==0.21.0"
 pyqt5 = "==5.15.11"
 
 [requires]
diff --git a/Pipfile.lock b/Pipfile.lock
index 1b6419a8..c2133af8 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "ed18b574bba0a525372bfad99b9ffaeea39442d9f3832ee7465cbe668c86f401"
+            "sha256": "e49beff4de88f930d364e5ce9789f89ee240cb006aef9210ce08c61bead2078b"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -2488,12 +2488,12 @@
         },
         "prometheus-client": {
             "hashes": [
-                "sha256:287629d00b147a32dcb2be0b9df905da599b2d82f80377083ec8463309a4bb89",
-                "sha256:cde524a85bce83ca359cc837f28b8c0db5cac7aa653a588fd7e84ba061c329e7"
+                "sha256:4fa6b4dd0ac16d58bb587c04b1caae65b8c5043e85f778f42f5f632f6af2e166",
+                "sha256:96c83c606b71ff2b0a433c98889d275f51ffec6c5e267de37c7a2b5c9aa9233e"
             ],
             "index": "pypi",
             "markers": "python_version >= '3.8'",
-            "version": "==0.20.0"
+            "version": "==0.21.0"
         },
         "prompt-toolkit": {
             "hashes": [