diff --git a/CITATION.cff b/CITATION.cff
index 7363ae0ff..b743b07c9 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -30,6 +30,6 @@ authors:
 - family-names: "Picheny"
   given-names: "Victor"
 title: "Trieste"
-version: 4.0.0
-date-released: 2024-08-27
+version: 4.0.1
+date-released: 2024-09-10
 url: "https://github.com/secondmind-labs/trieste"
diff --git a/trieste/VERSION b/trieste/VERSION
index fcdb2e109..1454f6ed4 100644
--- a/trieste/VERSION
+++ b/trieste/VERSION
@@ -1 +1 @@
-4.0.0
+4.0.1
diff --git a/versions.json b/versions.json
index 24e78d148..0f6c25160 100644
--- a/versions.json
+++ b/versions.json
@@ -4,8 +4,8 @@
     "url": "https://secondmind-labs.github.io/trieste/develop/"
   },
   {
-    "version": "4.0.0",
-    "url": "https://secondmind-labs.github.io/trieste/4.0.0/"
+    "version": "4.0.1",
+    "url": "https://secondmind-labs.github.io/trieste/4.0.1/"
   },
   {
     "version": "3.4.0",