diff --git a/Cargo.lock b/Cargo.lock
index 4e59d28..5c242d9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -34,7 +34,7 @@ checksum = "ed570934406eb16438a4e976b1b4500774099c13b8cb96eec99f620f05090ddf"
 
 [[package]]
 name = "bourse"
-version = "0.3.1"
+version = "0.4.0"
 dependencies = [
  "bourse-book",
  "bourse-de",
@@ -46,7 +46,7 @@ dependencies = [
 
 [[package]]
 name = "bourse-book"
-version = "0.3.1"
+version = "0.4.0"
 dependencies = [
  "rand",
  "rand_xoshiro",
@@ -56,7 +56,7 @@ dependencies = [
 
 [[package]]
 name = "bourse-de"
-version = "0.3.1"
+version = "0.4.0"
 dependencies = [
  "assert_approx_eq",
  "bourse-book",
@@ -70,7 +70,7 @@ dependencies = [
 
 [[package]]
 name = "bourse-macros"
-version = "0.3.1"
+version = "0.4.0"
 dependencies = [
  "quote",
  "syn 1.0.109",
diff --git a/Cargo.toml b/Cargo.toml
index d173a47..200dbc4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ members = [
 resolver = "2"
 
 [workspace.package]
-version = "0.3.1"
+version = "0.4.0"
 edition = "2021"
 license = "MIT"
 authors = ["zombie-einstein"]
diff --git a/crates/step_sim/Cargo.toml b/crates/step_sim/Cargo.toml
index 752d3d0..1d752c6 100644
--- a/crates/step_sim/Cargo.toml
+++ b/crates/step_sim/Cargo.toml
@@ -16,8 +16,8 @@ rand.workspace = true
 kdam = "0.5.1"
 rand_distr = "0.4.3"
 
-bourse-book = { path="../order_book" , version="0.3.1" }
-bourse-macros = { path="../macros", version="0.3.1" }
+bourse-book = { path="../order_book" , version="0.4.0" }
+bourse-macros = { path="../macros", version="0.4.0" }
 
 [dev-dependencies]
 assert_approx_eq = "1.1.0"
diff --git a/pyproject.toml b/pyproject.toml
index 38d3160..a05507c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ build-backend = "maturin"
 
 [project]
 name = "bourse"
-version = "0.3.1"
+version = "0.4.0"
 description = "Python API for a Rust stock market simulation library"
 readme = "README.md"
 requires-python = ">=3.8"