diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6f88ad..4afd745 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 0.4.2 (unreleased)
+## 0.4.2 (2023-05-13)
 
 - Added notice when index created with little data
 - Fixed dimensions check for some direct function calls
diff --git a/META.json b/META.json
index 85e50d9..f90cbbc 100644
--- a/META.json
+++ b/META.json
@@ -2,7 +2,7 @@
 	"name": "vector",
 	"abstract": "Open-source vector similarity search for Postgres",
 	"description": "Supports L2 distance, inner product, and cosine distance",
-	"version": "0.4.1",
+	"version": "0.4.2",
 	"maintainer": [
 		"Andrew Kane <andrew@ankane.org>"
 	],
@@ -20,7 +20,7 @@
 		"vector": {
 			"file": "sql/vector.sql",
 			"docfile": "README.md",
-			"version": "0.4.1",
+			"version": "0.4.2",
 			"abstract": "Open-source vector similarity search for Postgres"
 		}
 	},
diff --git a/Makefile b/Makefile
index 8540523..7292da6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 EXTENSION = vector
-EXTVERSION = 0.4.1
+EXTVERSION = 0.4.2
 
 MODULE_big = vector
 DATA = $(wildcard sql/*--*.sql)
diff --git a/Makefile.win b/Makefile.win
index 028a850..994aee3 100644
--- a/Makefile.win
+++ b/Makefile.win
@@ -1,5 +1,5 @@
 EXTENSION = vector
-EXTVERSION = 0.4.1
+EXTVERSION = 0.4.2
 
 OBJS = src\ivfbuild.obj src\ivfflat.obj src\ivfinsert.obj src\ivfkmeans.obj src\ivfscan.obj src\ivfutils.obj src\ivfvacuum.obj src\vector.obj
 
diff --git a/README.md b/README.md
index e634428..28bb37a 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ Compile and install the extension (supports Postgres 11+)
 
 ```sh
 cd /tmp
-git clone --branch v0.4.1 https://github.com/pgvector/pgvector.git
+git clone --branch v0.4.2 https://github.com/pgvector/pgvector.git
 cd pgvector
 make
 make install # may need sudo
@@ -379,7 +379,7 @@ Support for Windows is currently experimental. Use `nmake` to build:
 
 ```cmd
 set "PGROOT=C:\Program Files\PostgreSQL\15"
-git clone --branch v0.4.1 https://github.com/pgvector/pgvector.git
+git clone --branch v0.4.2 https://github.com/pgvector/pgvector.git
 cd pgvector
 nmake /F Makefile.win
 nmake /F Makefile.win install
@@ -400,7 +400,7 @@ This adds pgvector to the [Postgres image](https://hub.docker.com/_/postgres) (r
 You can also build the image manually:
 
 ```sh
-git clone --branch v0.4.1 https://github.com/pgvector/pgvector.git
+git clone --branch v0.4.2 https://github.com/pgvector/pgvector.git
 cd pgvector
 docker build -t pgvector .
 ```
diff --git a/sql/vector--0.4.1--0.4.2.sql b/sql/vector--0.4.1--0.4.2.sql
new file mode 100644
index 0000000..24abacc
--- /dev/null
+++ b/sql/vector--0.4.1--0.4.2.sql
@@ -0,0 +1,2 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "ALTER EXTENSION vector UPDATE TO '0.4.2'" to load this file. \quit
diff --git a/vector.control b/vector.control
index 11726fe..54f9cdd 100644
--- a/vector.control
+++ b/vector.control
@@ -1,4 +1,4 @@
 comment = 'vector data type and ivfflat access method'
-default_version = '0.4.1'
+default_version = '0.4.2'
 module_pathname = '$libdir/vector'
 relocatable = true