diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02b4b9c..058958c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 Nothing yet.
 
+## [4.1.0] - 2020-04-08
+
+### Changed
+
+  - Specify http://localhost:8888 as the default OCSP responder URL that’s added to certificates.
+
 ## [4.0.0] - 2020-04-07
 
 ### Changed
diff --git a/README.md b/README.md
index 5c3f19e..2c210cb 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,7 @@ The default configuration file is at __bin/test/config/pebble-config.json__:
     "privateKey": "test/certs/localhost/key.pem",
     "httpPort": 80,
     "tlsPort": 443,
-    "ocspResponderURL": "",
+    "ocspResponderURL": "http://localhost:8888",
     "externalAccountBindingRequired": false
   }
 }
diff --git a/bin/test/config/pebble-config.json b/bin/test/config/pebble-config.json
index 8516a18..54db6dd 100644
--- a/bin/test/config/pebble-config.json
+++ b/bin/test/config/pebble-config.json
@@ -6,7 +6,7 @@
     "privateKey": "test/certs/localhost/key.pem",
     "httpPort": 80,
     "tlsPort": 443,
-    "ocspResponderURL": "",
+    "ocspResponderURL": "http://localhost:8888",
     "externalAccountBindingRequired": false
   }
 }
diff --git a/package.json b/package.json
index 30d7e54..adc4159 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@small-tech/node-pebble",
-  "version": "4.0.0",
+  "version": "4.1.0",
   "description": "A Node.js wrapper for Let’s Encrypt’s Pebble (“a small RFC 8555 ACME test server not suited for a production certificate authority”).",
   "main": "index.js",
   "os": [