diff --git a/docker/docker-compose.2004.56.yaml b/docker/docker-compose.2004.56.yaml
new file mode 100644
index 0000000..641986c
--- /dev/null
+++ b/docker/docker-compose.2004.56.yaml
@@ -0,0 +1,17 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-metrics:20.04-5.6
+    build:
+      args:
+        base_image: "swiftlang/swift:nightly-5.6-focal"
+
+  test:
+    image: swift-metrics:20.04-5.6
+    environment: []
+      #- SANITIZER_ARG=--sanitize=thread
+
+  shell:
+    image: swift-metrics:20.04-5.6