diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 09c28380..c8b05249 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -16,9 +16,9 @@ jobs:
           - macos
           - windows
         python-version:
-          - "8"
           - "9"
           - "10"
+          - "11"
         include:
           - os: ubuntu
             platform: linux
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 41c52e6e..1a20d5d0 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -14,7 +14,7 @@ jobs:
       strategy:
         fail-fast: true
         matrix:
-          python-version: ['3.8', '3.9', '3.10']
+          python-version: ['3.9', '3.10', '3.11']
 
       env:
         PYTHON: ${{ matrix.python-version }}
diff --git a/docs/src/developers.md b/docs/src/developers.md
index 8bacb111..956e8f76 100644
--- a/docs/src/developers.md
+++ b/docs/src/developers.md
@@ -8,4 +8,63 @@
 `cargo test` should compile when run in /rust because there are no tests in `/rust/fastsim-py`.
 
 ## build_and_test.sh
-Running `sh build_and_test.sh` from the root fastsim directory compile/tests the Rust code, and tests the Python code. It should compile without errors.
\ No newline at end of file
+Running `sh build_and_test.sh` from the root fastsim directory compile/tests the Rust code, and tests the Python code. It should compile without errors.
+
+
+# Releasing
+## Incrementing the Version Number
+Increment the 3rd decimal place in the version number for small changes (e.g.
+minor bug fixes, new variables), the 2nd for medium changes (e.g. new methods
+or classes), and the 1st for large changes (e.g. changes to the interface that
+might affect backwards compatibility / the API interface).
+
+## Instructions
+1. Create and check out a new branch, e.g. for version X.X.X:
+    ```
+    git checkout -b fastsim-X.X.X
+    ```
+1. Update the version number in the `pyproject.toml` file
+1. If changes have happened in `rust/`, increment the Rust crate version numbers in `rust/fastsim-core/Cargo.toml` and `rust/fastsim-core/fastsim-proc-macros/Cargo.toml`
+1. Commit changes, as appropriate:
+    ```
+    git add pyproject.toml README.md rust/fastsim-core/Cargo.toml rust/fastsim-core/fastsim-proc-macros/Cargo.toml
+    ```
+    ```
+    git commit -m "vX.X.X"
+    ```
+1. Tag the commit with the new version number, prepended with a `v`:
+    ```
+    git tag vX.X.X
+    ```
+    Or, optionally, you can also add a tag message with the `-m` flag, for example:
+    ```
+    git tag vX.X.X -m "release version X.X.X"
+    ```
+1. Push the commit to the GitHub.com repository (for Git remote setup instructions, see [this page](https://github.nrel.gov/MBAP/fastsim/wiki/Setting-up-FASTSim-Git-remotes-for-development)):
+    ```
+    git push -u external fastsim-X.X.X
+    ```
+1. Push the tag:
+    ```
+    git push external vX.X.X
+    ```
+    This will start the `wheels.yaml` GitHub Actions workflow and run all tests
+1. Create a PR for the new version in the external repository, using the `release` label for organization
+1. When all tests pass, and a review has been completed, merge the PR
+1. If changes were made in `rust/`, publish the crates (you must be listed as an owner of both crates on crates.io):  
+    If necessary, log into crates.io first after adding and verifying your email at https://crates.io/settings/profile:
+    ```sh
+    cargo login
+    ```
+    Then, run these commands to update the crates (order matters):
+    ```sh
+    (cd rust/fastsim-core/fastsim-proc-macros && cargo publish)
+    (cd rust/fastsim-core && cargo publish)
+    ```
+1. Start a new release at /~https://github.com/NREL/fastsim/releases/new, selecting `vX.X.X` as both the tag and the release name. Click "Generate release notes" to automatically create a detailed change log.
+1. Click "Publish release". Wheels will then be built for various platforms and automatically uploaded to the PyPI at https://pypi.org/project/fastsim/. **Check that the release workflow finished properly at /~https://github.com/NREL/fastsim/actions/workflows/release.yaml!**
+1. Synchronize changes to the internal GitHub repository:
+    ```
+    git pull external fastsim-2
+    git push origin fastsim-2
+    ```
diff --git a/pyproject.toml b/pyproject.toml
index e1696c98..ddbe6059 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,12 +4,12 @@ build-backend = "maturin"
 
 [project]
 name = "fastsim"
-version = "2.1.3"
+version = "2.1.4"
 authors = [{ name = "NREL/MTES/CIMS/MBAP Group", email = "fastsim@nrel.gov" }]
 description = "Tool for modeling vehicle powertrains"
 readme = "README.md"
 license = { file = "LICENSE" }
-requires-python = ">=3.8,<3.11"
+requires-python = ">=3.9,<3.12"
 classifiers = [
     "Programming Language :: Python :: 3",
     "License :: OSI Approved :: Apache Software License",
diff --git a/rust/fastsim-cli/Cargo.toml b/rust/fastsim-cli/Cargo.toml
index 79043bd4..fa728f63 100644
--- a/rust/fastsim-cli/Cargo.toml
+++ b/rust/fastsim-cli/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "fastsim-cli"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 rust-version.workspace = true
 license = "Apache-2.0"
diff --git a/rust/fastsim-core/Cargo.toml b/rust/fastsim-core/Cargo.toml
index 5293fc30..16fc23c4 100644
--- a/rust/fastsim-core/Cargo.toml
+++ b/rust/fastsim-core/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "fastsim-core"
-version = "0.1.7"
+version = "0.1.9"
 edition = "2021"
 rust-version.workspace = true
 license = "Apache-2.0"
@@ -11,7 +11,7 @@ readme = "../../README.md"
 repository = "/~https://github.com/NREL/fastsim"
 
 [dependencies]
-fastsim-proc-macros = { package = "fastsim-proc-macros", path = "./fastsim-proc-macros", version = "0.1.5" }
+fastsim-proc-macros = { package = "fastsim-proc-macros", path = "./fastsim-proc-macros", version = "0.1.9" }
 pyo3 = { workspace = true, features = [
     "extension-module",
     "anyhow",
diff --git a/rust/fastsim-core/fastsim-proc-macros/Cargo.toml b/rust/fastsim-core/fastsim-proc-macros/Cargo.toml
index 085fd1b8..47e69b7b 100644
--- a/rust/fastsim-core/fastsim-proc-macros/Cargo.toml
+++ b/rust/fastsim-core/fastsim-proc-macros/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 authors = ["NREL/MTES/CIMS/MBAP Group <fastsim@nrel.gov>"]
 name = "fastsim-proc-macros"
-version = "0.1.7"
+version = "0.1.9"
 edition = "2021"
 license = "Apache-2.0"
 readme = "../../../README.md"
diff --git a/rust/fastsim-core/src/simdrivelabel.rs b/rust/fastsim-core/src/simdrivelabel.rs
index ea019e04..b7804c46 100644
--- a/rust/fastsim-core/src/simdrivelabel.rs
+++ b/rust/fastsim-core/src/simdrivelabel.rs
@@ -388,7 +388,7 @@ pub fn get_label_fe(
 
 #[cfg(feature = "pyo3")]
 #[pyfunction(name = "get_label_fe")]
-#[pyo3(signature = (veh, full_detail=None, verbose=None))]
+#[cfg_attr(feature = "pyo3", pyo3(signature = (veh, full_detail=None, verbose=None)))]
 /// pyo3 version of [get_label_fe]
 pub fn get_label_fe_py(
     veh: &vehicle::RustVehicle,
diff --git a/rust/fastsim-core/src/vehicle_import.rs b/rust/fastsim-core/src/vehicle_import.rs
index 18d907b0..711bc0fe 100644
--- a/rust/fastsim-core/src/vehicle_import.rs
+++ b/rust/fastsim-core/src/vehicle_import.rs
@@ -286,13 +286,13 @@ pub struct VehicleDataEPA {
 impl SerdeAPI for VehicleDataEPA {}
 
 #[cfg_attr(feature = "pyo3", pyfunction)]
-#[pyo3(signature = (
+#[cfg_attr(feature = "pyo3", pyo3(signature = (
     year,
     make,
     model,
     cache_url=None,
     data_dir=None,
-))]
+)))]
 /// Gets options from fueleconomy.gov for the given vehicle year, make, and model
 ///
 /// Arguments:
@@ -342,12 +342,12 @@ pub fn get_options_for_year_make_model(
 }
 
 #[cfg_attr(feature = "pyo3", pyfunction)]
-#[pyo3(signature = (
+#[cfg_attr(feature = "pyo3", pyo3(signature = (
     id,
     year,
     cache_url=None,
     data_dir=None,
-))]
+)))]
 pub fn get_vehicle_data_for_id(
     id: i32,
     year: &str,
@@ -775,13 +775,13 @@ pub struct OtherVehicleInputs {
 impl SerdeAPI for OtherVehicleInputs {}
 
 #[cfg_attr(feature = "pyo3", pyfunction)]
-#[pyo3(signature = (
+#[cfg_attr(feature = "pyo3", pyo3(signature = (
     vehicle_id,
     year,
     other_inputs,
     cache_url=None,
     data_dir=None,
-))]
+)))]
 /// Creates RustVehicle for the given vehicle using data from fueleconomy.gov and EPA databases
 /// The created RustVehicle is also written as a yaml file
 ///
@@ -1316,14 +1316,14 @@ fn load_fegov_data_for_given_years<P: AsRef<Path>>(
     Ok(data)
 }
 #[cfg_attr(feature = "pyo3", pyfunction)]
-#[pyo3(signature = (
+#[cfg_attr(feature = "pyo3", pyo3(signature = (
     year,
     make,
     model,
     other_inputs,
     cache_url=None,
     data_dir=None,
-))]
+)))]
 /// Import All Vehicles for the given Year, Make, and Model and supplied other inputs
 pub fn import_all_vehicles(
     year: u32,
diff --git a/rust/fastsim-core/src/vehicle_utils.rs b/rust/fastsim-core/src/vehicle_utils.rs
index ad3615c2..ae084b1b 100644
--- a/rust/fastsim-core/src/vehicle_utils.rs
+++ b/rust/fastsim-core/src/vehicle_utils.rs
@@ -27,7 +27,7 @@ pub const NETWORK_TEST_DISABLE_ENV_VAR_NAME: &str = "FASTSIM_DISABLE_NETWORK_TES
 #[cfg_attr(feature = "pyo3", pyfunction)]
 #[allow(clippy::too_many_arguments)]
 #[cfg(feature = "default")]
-#[pyo3(signature = (
+#[cfg_attr(feature = "pyo3", pyo3(signature = (
     veh,
     a_lbf,
     b_lbf__mph,
@@ -37,7 +37,7 @@ pub const NETWORK_TEST_DISABLE_ENV_VAR_NAME: &str = "FASTSIM_DISABLE_NETWORK_TES
     custom_rho_elevation_m=None,
     simdrive_optimize=None,
     _show_plots=None,
-))]
+)))]
 pub fn abc_to_drag_coeffs(
     veh: &mut RustVehicle,
     a_lbf: f64,
diff --git a/rust/fastsim-py/Cargo.toml b/rust/fastsim-py/Cargo.toml
index 74d553f3..9829e7d4 100644
--- a/rust/fastsim-py/Cargo.toml
+++ b/rust/fastsim-py/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "fastsim-py"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 rust-version.workspace = true
 license = "Apache-2.0"