diff --git a/CITATION.cff b/CITATION.cff
index 33e811241..f3e308373 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -30,6 +30,6 @@ authors:
 - family-names: "Picheny"
   given-names: "Victor"
 title: "Trieste"
-version: 4.1.0
-date-released: 2024-09-18
+version: 4.2.0
+date-released: 2024-09-20
 url: "https://github.com/secondmind-labs/trieste"
diff --git a/trieste/VERSION b/trieste/VERSION
index ee74734aa..6aba2b245 100644
--- a/trieste/VERSION
+++ b/trieste/VERSION
@@ -1 +1 @@
-4.1.0
+4.2.0
diff --git a/versions.json b/versions.json
index 20612fa66..92cbc810c 100644
--- a/versions.json
+++ b/versions.json
@@ -3,6 +3,10 @@
     "version": "develop",
     "url": "https://secondmind-labs.github.io/trieste/develop/"
   },
+  {
+    "version": "4.2.0",
+    "url": "https://secondmind-labs.github.io/trieste/4.2.0/"
+  },
   {
     "version": "4.1.0",
     "url": "https://secondmind-labs.github.io/trieste/4.1.0/"