diff --git a/Cargo.lock b/Cargo.lock
index 6ecc3f6..ecc69b8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -139,7 +139,7 @@ dependencies = [
 
 [[package]]
 name = "csv-gp"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "clap",
  "csv",
@@ -151,7 +151,7 @@ dependencies = [
 
 [[package]]
 name = "csv-gp-python"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "csv-gp",
  "pyo3",
diff --git a/README.md b/README.md
index a1aff85..48e0143 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@ The get_rows once again takes a path to file, the delimiter and the encoding and
 
 ## Releasing a new version of the Python lib
 
-1. Update version numbers in `csv_gp_python/Cargo.toml` and `csv_gp_python/pyproject.toml`
+1. Update version numbers in `csv_gp_python/Cargo.toml`, `csv_go/Cargo.toml`, and `csv_gp_python/pyproject.toml`
 2. Run `cargo check` to update the lock files with new versions
 3. Merge this change into main
 4. Create a new release on GitHub, creating a tag in the form `vX.Y.Z`
diff --git a/csv_gp/Cargo.toml b/csv_gp/Cargo.toml
index 7ffae07..7a993e4 100644
--- a/csv_gp/Cargo.toml
+++ b/csv_gp/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "csv-gp"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2024"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
diff --git a/csv_gp_python/Cargo.toml b/csv_gp_python/Cargo.toml
index c72d015..ad8382e 100644
--- a/csv_gp_python/Cargo.toml
+++ b/csv_gp_python/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "csv-gp-python"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2024"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
diff --git a/csv_gp_python/pyproject.toml b/csv_gp_python/pyproject.toml
index 1875ffa..6e56c26 100644
--- a/csv_gp_python/pyproject.toml
+++ b/csv_gp_python/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "maturin"
 [project]
 name = "csv-gp"
 requires-python = ">=3.10"
-version = "0.3.0"
+version = "0.4.0"
 classifiers = [
     "Programming Language :: Rust",
     "Programming Language :: Python :: Implementation :: CPython",