diff --git a/nixos/tests/prometheus.nix b/nixos/tests/prometheus.nix
index bce489168f9f..af2aa66a5526 100644
--- a/nixos/tests/prometheus.nix
+++ b/nixos/tests/prometheus.nix
@@ -158,7 +158,10 @@ in import ./make-test-python.nix {
 
     s3 = { pkgs, ... } : {
       # Minio requires at least 1GiB of free disk space to run.
-      virtualisation.diskSize = 2 * 1024;
+      virtualisation = {
+        diskSize = 2 * 1024;
+        memorySize = 1024;
+      };
       networking.firewall.allowedTCPPorts = [ minioPort ];
 
       services.minio = {
@@ -235,7 +238,7 @@ in import ./make-test-python.nix {
     # Test if the Thanos bucket command is able to retrieve blocks from the S3 bucket
     # and check if the blocks have the correct labels:
     store.succeed(
-        "thanos bucket ls "
+        "thanos tools bucket ls "
         + "--objstore.config-file=${nodes.store.config.services.thanos.store.objstore.config-file} "
         + "--output=json | "
         + "jq .thanos.labels.some_label | "
diff --git a/pkgs/servers/monitoring/prometheus/default.nix b/pkgs/servers/monitoring/prometheus/default.nix
index 0b17f7801b68..7e729cd366f3 100644
--- a/pkgs/servers/monitoring/prometheus/default.nix
+++ b/pkgs/servers/monitoring/prometheus/default.nix
@@ -1,13 +1,13 @@
-{ lib, go, buildGoPackage, fetchFromGitHub, mkYarnPackage }:
+{ lib, go, buildGoPackage, fetchFromGitHub, mkYarnPackage, nixosTests }:
 
 let
-  version = "2.19.3";
+  version = "2.20.1";
 
   src = fetchFromGitHub {
     rev = "v${version}";
     owner = "prometheus";
     repo = "prometheus";
-    sha256 = "0dlvhbxahdq0x0qa0gv1rc4y5dp6lx44w280rbm9279nv1nplffh";
+    sha256 = "0svhx08pbz55nhn6g9pn79zbhyvr394k5w3ny1mq3wp382h62r5j";
   };
 
   webui = mkYarnPackage {
@@ -61,6 +61,8 @@ in buildGoPackage rec {
 
   doCheck = true;
 
+  passthru.tests = { inherit (nixosTests) prometheus; };
+
   meta = with lib; {
     description = "Service monitoring system and time series database";
     homepage = "https://prometheus.io";
diff --git a/pkgs/servers/monitoring/prometheus/webui-yarndeps.nix b/pkgs/servers/monitoring/prometheus/webui-yarndeps.nix
index 7e9843dc98b0..8b7d346e5600 100644
--- a/pkgs/servers/monitoring/prometheus/webui-yarndeps.nix
+++ b/pkgs/servers/monitoring/prometheus/webui-yarndeps.nix
@@ -4122,11 +4122,11 @@
       };
     }
     {
-      name = "elliptic___elliptic_6.5.2.tgz";
+      name = "elliptic___elliptic_6.5.3.tgz";
       path = fetchurl {
-        name = "elliptic___elliptic_6.5.2.tgz";
-        url  = "https://registry.yarnpkg.com/elliptic/-/elliptic-6.5.2.tgz";
-        sha1 = "05c5678d7173c049d8ca433552224a495d0e3762";
+        name = "elliptic___elliptic_6.5.3.tgz";
+        url  = "https://registry.yarnpkg.com/elliptic/-/elliptic-6.5.3.tgz";
+        sha1 = "cb59eb2efdaf73a0bd78ccd7015a62ad6e0f93d6";
       };
     }
     {
@@ -11698,11 +11698,11 @@
       };
     }
     {
-      name = "websocket_extensions___websocket_extensions_0.1.3.tgz";
+      name = "websocket_extensions___websocket_extensions_0.1.4.tgz";
       path = fetchurl {
-        name = "websocket_extensions___websocket_extensions_0.1.3.tgz";
-        url  = "https://registry.yarnpkg.com/websocket-extensions/-/websocket-extensions-0.1.3.tgz";
-        sha1 = "5d2ff22977003ec687a4b87073dfbbac146ccf29";
+        name = "websocket_extensions___websocket_extensions_0.1.4.tgz";
+        url  = "https://registry.yarnpkg.com/websocket-extensions/-/websocket-extensions-0.1.4.tgz";
+        sha1 = "7f8473bc839dfd87608adb95d7eb075211578a42";
       };
     }
     {