diff --git a/MODULE.bazel b/MODULE.bazel
index d758ba0..7e81aa5 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -1,6 +1,6 @@
 module(
     name = "rules_chisel",
-    version = "0.3.1",
+    version = "0.4.0",
     bazel_compatibility = [">=7.6.0"],
 )
 
diff --git a/README.md b/README.md
index fe356ea..b49efbb 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ This repository packages the following helpers as a BCR-friendly module:
 Add this to your `MODULE.bazel`:
 
 ```starlark
-bazel_dep(name = "rules_chisel", version = "0.3.1")
+bazel_dep(name = "rules_chisel", version = "0.4.0")
 
 # rules_chisel uses rules_scala underneath.
 bazel_dep(name = "rules_scala", version = "7.1.5")
diff --git a/version.bzl b/version.bzl
index b4b37a9..0b2e186 100644
--- a/version.bzl
+++ b/version.bzl
@@ -1,3 +1,3 @@
 """package version"""
 
-VERSION = "0.3.1"
+VERSION = "0.4.0"