diff --git a/.changes/ldap-await-server-init.md b/.changes/ldap-await-server-init.md
new file mode 100644
index 00000000..603acde9
--- /dev/null
+++ b/.changes/ldap-await-server-init.md
@@ -0,0 +1,6 @@
+---
+"@simulacrum/ldap-simulator": patch
+---
+
+Don't resolve `createLDAPServer()` until server is known to be accepting
+connections.
diff --git a/.circleci/config.yml b/.circleci/config.yml
index afb631a9..147e547d 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,6 +1,6 @@
 version: 2.1
 orbs:
-  node: circleci/node@4.3.0
+  node: circleci/node@5.1.0
 jobs:
   test:
     docker:
diff --git a/packages/ldap/src/index.ts b/packages/ldap/src/index.ts
index df24e928..c046db23 100644
--- a/packages/ldap/src/index.ts
+++ b/packages/ldap/src/index.ts
@@ -139,15 +139,23 @@ filter: ${req.filter.toString()}
         }
       });
 
-      server.listen(port, function () {
-        logger.log(dedent`LDAP test server running on port ${port});
+      yield new Promise<void>((resolve, reject) => {
+        server.listen(port, function (err: Error) {
+          if (err) {
+            reject(err);
+          } else {
+            resolve();
+          }
+        });
+      });
+
+      logger.log(dedent`LDAP test server running on port ${port}
 
 BindDN: bindDn = ${bindDn} cn=${bindDn},${baseDN}
 Bind Password: ${bindPassword}
 
 UserBaseDN:    ${bindDn}
 `);
-      });
 
       yield spawn(function* shutdown() {
         try {