diff --git a/Cargo.toml b/Cargo.toml
index de0a8c0..8730a77 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,10 +2,12 @@
 nightly = ["pulp/nightly"]
 # Treat warnings as a build error.
 strict = []
+sleef = ["rlst/sleef"]
+default = ["sleef"]
 
 [package]
 name = "green-kernels"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2021"
 authors = ["Timo Betcke <timo.betcke@gmail.com>", "Matthew Scroggs <rust@mscroggs.co.uk>"]
 description = "Evaluation of Green's function kernels."
@@ -27,7 +29,7 @@ approx = { version = "0.5", features = ["num-complex"] }
 rayon = "1.9"
 num = "0.4"
 num_cpus = "1"
-rlst = { version = "0.2", features = ["sleef"] }
+rlst = { version = "0.2" }
 rand = "0.8.5"
 itertools = { version = "0.13.0", default-features = false }
 coe-rs = "0.1.2"
diff --git a/RELEASE.md b/RELEASE.md
index cfea8e9..d35e8c8 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -5,10 +5,12 @@ To make a new release of green-kernels, follow the following steps:
 0) If you are yet to make a release on your current computer, run `cargo login` and copy an API
    key from https://crates.io/me
 
-1) Checkout the branch `release` and merge the branch `main` into the branch `release`:
+1) Checkout the `main` branch and `git pull`, then checkout a new branch called `release-v[x].[y].[z]`
+   (where `[x]`, `[y]`, and `[z]` are defined in the next step):
    ```bash
-   git checkout release
-   git merge main
+   git checkout main
+   git pull
+   git checkout -b release-v[x].[y].[z]
    ```
 
 2) Update the version number in `Cargo.toml`.
@@ -17,21 +19,19 @@ To make a new release of green-kernels, follow the following steps:
    If you are releasing a minor version, you should increment `[y]` and set `[z]`
    to zero. If you are releasing a bugfix, you should increment `[z]`.
 
-3) Commit your changes and push to GitHub, and check that all the tests on CI pass.
-   In `Cargo.toml`, check that the `rlst` dependency is at the latest version.
+3) Commit your changes and push to GitHub, open a pull request to merge changes back into main, and merge the
+   pull request.
 
-4) Commit your changes and push to GitHub, and check that all the tests on CI pass.
-
-5) [Create a release on GitHub](https://github.com/bempp/green-kernels/releases/new) from the `release` branch.
+4) [Create a release on GitHub](https://github.com/bempp/green-kernels/releases/new) from the `release` branch.
    The release tag and title should be `v[x].[y].[z]` (where `[x]`, `[y]` and `[z]` are as in step 2).
    In the "Describe this release" box, you should bullet point the main changes since the last
    release.
 
-6) Run `cargo publish --dry-run`, then run `cargo package --list` and
+5) Run `cargo publish --dry-run`, then run `cargo package --list` and
    check that no unwanted extras have been included in the release.
 
-7) If everything is working as expected, run `cargo publish`. This will push the new version to
+6) If everything is working as expected, run `cargo publish`. This will push the new version to
    crates.io. Note: this cannot be undone, but you can use `cargo yank` to mark a version as
    unsuitable for use.
 
-8) Open a pull request to `main` to update the version number in `Cargo.toml` to `[x].[y].[z]-dev`
+7) Open a pull request to `main` to update the version number in `Cargo.toml` to `[x].[y].[z]-dev`