diff --git a/package.json b/package.json
index 5d8bcbe..81cf199 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "optional": "^0.1.3"
   },
   "peerDependencies": {
-    "prom-client": ">= 10 < 12"
+    "prom-client": ">= 10 <= 12"
   },
   "devDependencies": {
     "eslint": "^5.6.0",
@@ -41,7 +41,7 @@
     "eslint-config-simenb-node": "^2.0.0",
     "jest": "^24.0.0",
     "prettier": "^1.4.4",
-    "prom-client": "^11.2.1"
+    "prom-client": "^12.0.0"
   },
   "jest": {
     "testEnvironment": "node"
diff --git a/yarn.lock b/yarn.lock
index f1b7428..5c4b8c8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3254,10 +3254,10 @@ progress@^2.0.0:
   resolved "https://registry.yarnpkg.com/progress/-/progress-2.0.3.tgz#7e8cf8d8f5b8f239c1bc68beb4eb78567d572ef8"
   integrity sha512-7PiHtLll5LdnKIMw100I+8xJXR5gW2QwWYkT6iJva0bXitZKa/XMrSbdmg3r2Xnaidz9Qumd0VPaMrZlF9V9sA==
 
-prom-client@^11.2.1:
-  version "11.3.0"
-  resolved "https://registry.yarnpkg.com/prom-client/-/prom-client-11.3.0.tgz#fe93f360182f1ec1921722efc211a6c0e68e0253"
-  integrity sha512-OqSf5WOvpGZXkfqPXUHNHpjrbEE/q8jxjktO0i7zg1cnULAtf0ET67/J5R4e4iA4MZx2260tzTzSFSWgMdTZmQ==
+prom-client@^12.0.0:
+  version "12.0.0"
+  resolved "https://registry.yarnpkg.com/prom-client/-/prom-client-12.0.0.tgz#9689379b19bd3f6ab88a9866124db9da3d76c6ed"
+  integrity sha512-JbzzHnw0VDwCvoqf8y1WDtq4wSBAbthMB1pcVI/0lzdqHGJI3KBJDXle70XK+c7Iv93Gihqo0a5LlOn+g8+DrQ==
   dependencies:
     tdigest "^0.1.1"