diff --git a/package-testing/python-sdk-relay/.env.SAMPLE b/package-testing/python-sdk-relay/.env.SAMPLE
new file mode 100644
index 0000000..4fab25b
--- /dev/null
+++ b/package-testing/python-sdk-relay/.env.SAMPLE
@@ -0,0 +1,3 @@
+SDK_REF=main
+SDK_RELAY_HOST=localhost
+SDK_RELAY_PORT=4000
diff --git a/package-testing/python-sdk-relay/.gitignore b/package-testing/python-sdk-relay/.gitignore
index e9bb007..9ef644f 100644
--- a/package-testing/python-sdk-relay/.gitignore
+++ b/package-testing/python-sdk-relay/.gitignore
@@ -1,3 +1,4 @@
 bin
 lib
-venv
+.venv
+tmp
diff --git a/package-testing/python-sdk-relay/Dockerfile b/package-testing/python-sdk-relay/Dockerfile
deleted file mode 100644
index 183d3ab..0000000
--- a/package-testing/python-sdk-relay/Dockerfile
+++ /dev/null
@@ -1,11 +0,0 @@
-FROM python:3.12
-
-WORKDIR /app
-
-COPY requirements.txt .
-RUN pip install -r requirements.txt
-
-# Copy the source code
-COPY src/ ./src/
-
-CMD ["python", "/app/src/server.py"]
diff --git a/package-testing/python-sdk-relay/README.md b/package-testing/python-sdk-relay/README.md
index 5c56e29..61b503b 100644
--- a/package-testing/python-sdk-relay/README.md
+++ b/package-testing/python-sdk-relay/README.md
@@ -2,16 +2,8 @@
 
 Post test case files to this server and check the results against what's expected.
 
-## Running locally with Docker
-
-Build the docker image:
-
-```shell
-docker build -t Eppo-exp/python-sdk-relay .
-```
-
-Run the docker container:
+## Build and run
 
 ```shell
-./docker-run.sh
+./build-and-run.sh
 ```
diff --git a/package-testing/python-sdk-relay/build-and-run.sh b/package-testing/python-sdk-relay/build-and-run.sh
new file mode 100755
index 0000000..b9ef926
--- /dev/null
+++ b/package-testing/python-sdk-relay/build-and-run.sh
@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+
+# Set default values for vars
+
+: "${SDK_REF:=main}"
+: "${SDK_RELAY_HOST:=localhost}"
+: "${SDK_RELAY_PORT:=4000}"
+SDK="https://github.com/Eppo-exp/eppo-multiplatform.git"
+
+# Create a persistent virtual environment.
+if [ ! -d ".venv" ]; then
+    python3 -m venv .venv
+fi
+source .venv/bin/activate
+
+# checkout the specified ref of the SDK repo, build it, and then insert it into vendors here.
+rm -rf tmp
+mkdir -p tmp
+
+echo "Cloning ${SDK}@${SDK_REF}"
+git clone -b ${SDK_REF} --depth 1 --single-branch ${SDK} tmp || ( echo "Cloning repo failed"; exit 1 )
+
+# TODO: Refactor this into a `build.sh` script that resides in the SDK repo.
+
+# install dependencies
+
+pip install maturin
+pip install -r requirements.txt
+
+# Build the wheel file in tmp directory
+maturin build --release --out tmp/dist --find-interpreter --manifest-path ./tmp/python-sdk/Cargo.toml
+
+# Get Python version and find matching wheel
+PYTHON_VERSION=$(python3 -c 'import sys; print(f"cp{sys.version_info.major}{sys.version_info.minor}")')
+echo "Looking for wheel for Python version: ${PYTHON_VERSION}"
+
+WHEEL_FILE=$(find tmp/dist -name "eppo_server_sdk-*-${PYTHON_VERSION}-*.whl" | head -n 1)
+echo "Found wheel file: ${WHEEL_FILE}"
+
+if [ -z "$WHEEL_FILE" ]; then
+    echo "Error: Wheel file not found for Python version ${PYTHON_VERSION}"
+    echo "Available wheels:"
+    ls tmp/dist
+    exit 1
+fi
+
+pip install "${WHEEL_FILE}"
+
+# cleanup
+rm -rf tmp
+
+# start the relay server
+echo "Listening on port ${SDK_RELAY_HOST}:${SDK_RELAY_PORT}"
+python3 src/server.py
diff --git a/package-testing/python-sdk-relay/docker-run.sh b/package-testing/python-sdk-relay/docker-run.sh
deleted file mode 100755
index 5a14d35..0000000
--- a/package-testing/python-sdk-relay/docker-run.sh
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/usr/bin/env bash
-
-# Default is to use the latest build
-VERSION="${1:-latest}"
-
-echo "Starting deployment with version: $VERSION"
-
-if [ -e .env ]; then
-  echo "Loading environment variables from .env file"
-  source .env
-fi
-
-echo "Stopping existing container..."
-docker stop python-relay
-echo "Removing existing container..."
-docker remove python-relay
-
-echo "Building new image..."
-docker build . -t Eppo-exp/python-sdk-relay:$VERSION
-
-echo "Starting new container..."
-docker run -p $SDK_RELAY_PORT:$SDK_RELAY_PORT \
-  --add-host host.docker.internal:host-gateway \
-  -e SDK_REF \
-  -e EPPO_BASE_URL \
-  -e SDK_RELAY_PORT \
-  --name python-relay \
-  --rm \
-  -t Eppo-exp/python-sdk-relay:$VERSION;
diff --git a/package-testing/python-sdk-relay/requirements.txt b/package-testing/python-sdk-relay/requirements.txt
index 98476c9..9c2583c 100644
--- a/package-testing/python-sdk-relay/requirements.txt
+++ b/package-testing/python-sdk-relay/requirements.txt
@@ -1,2 +1,2 @@
 flask
-eppo-server-sdk==4.1.0
+# eppo-server-sdk installed from local wheel
diff --git a/package-testing/python-sdk-relay/src/server.py b/package-testing/python-sdk-relay/src/server.py
index 4f1aa88..b341cb7 100644
--- a/package-testing/python-sdk-relay/src/server.py
+++ b/package-testing/python-sdk-relay/src/server.py
@@ -160,7 +160,8 @@ def initialize_client_and_wait():
     initialize_client_and_wait()
     
     port = int(environ.get('SDK_RELAY_PORT', 7001))
-    host = environ.get('SDK_RELAY_HOST', '0.0.0.0')
+    # host = environ.get('SDK_RELAY_HOST', '0.0.0.0')
+    host = '0.0.0.0'
     print(f"Starting server on {host}:{port}")
     app.run(
         host=host,