diff --git a/Containerfile b/Containerfile
index 0c039ea..bbc1182 100644
--- a/Containerfile
+++ b/Containerfile
@@ -13,11 +13,11 @@ COPY pyproject.toml /opt/dagster/app
 # DagsterInstance.
 RUN uv sync
 
-EXPOSE 4000
+EXPOSE 4266
 
 # Using CMD rather than RUN allows the command to be overridden in
 # run launchers or executors to run other commands using this image.
 # This is important as runs are executed inside this container.
 ENTRYPOINT ["uv", "run"]
-CMD ["dagster", "api", "grpc", "-h", "0.0.0.0", "-p", "4000", "-m", "dagster_dags"]
+CMD ["dagster", "api", "grpc", "-h", "0.0.0.0", "-p", "4266", "-m", "dagster_dags"]
 
diff --git a/README.md b/README.md
index 479a734..1146fb9 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ $ docker pull ghcr.io/openclimatefix/dagster-dags
 
 ```bash
 $ docker run -d \
-    -p 4000:4000 \
+    -p 4266:4266 \
     -e DAGSTER_CURRENT_IMAGE=ghcr.io/openclimatefix/dagster-dags \
     ghcr.io/openclimatefix/dagster-dags
 ```
@@ -41,7 +41,7 @@ $ docker run -d \
 load_from:
   - grpc_server:
       host: localhost
-      port: 4000
+      port: 4266
       location_name: "dagster-dags" # Name of the module
 ```
 
diff --git a/infrastructure/docker-compose.yaml b/infrastructure/docker-compose.yaml
index f77a9fb..63cbd18 100644
--- a/infrastructure/docker-compose.yaml
+++ b/infrastructure/docker-compose.yaml
@@ -108,7 +108,7 @@ configs:
       load_from:
         - grpc_server:
             host: "dagster-codeserver"
-            port: 4000
+            port: 4266
             location_name: "dagster_dags"
 
   dagster.yaml: