diff --git a/src/haskell/testdata/Arion/NixSpec/arion-compose.json b/src/haskell/testdata/Arion/NixSpec/arion-compose.json
index 64b8169..063a51b 100644
--- a/src/haskell/testdata/Arion/NixSpec/arion-compose.json
+++ b/src/haskell/testdata/Arion/NixSpec/arion-compose.json
@@ -32,7 +32,7 @@
             ]
         }
     },
-    "version": "3.4",
+    "version": "3.8",
     "volumes": {},
     "x-arion": {
         "images": [
diff --git a/src/haskell/testdata/Arion/NixSpec/arion-context-compose.json b/src/haskell/testdata/Arion/NixSpec/arion-context-compose.json
index ae67f53..92d936a 100644
--- a/src/haskell/testdata/Arion/NixSpec/arion-context-compose.json
+++ b/src/haskell/testdata/Arion/NixSpec/arion-context-compose.json
@@ -17,7 +17,7 @@
             "volumes": []
         }
     },
-    "version": "3.4",
+    "version": "3.8",
     "volumes": {},
     "x-arion": {
         "images": [
diff --git a/src/haskell/testdata/docker-compose-example.json b/src/haskell/testdata/docker-compose-example.json
index 6fdaa0b..666bf76 100644
--- a/src/haskell/testdata/docker-compose-example.json
+++ b/src/haskell/testdata/docker-compose-example.json
@@ -21,7 +21,7 @@
       ]
     }
   },
-  "version": "3.4",
+  "version": "3.8",
   "x-arion": {
     "images": [
       {
diff --git a/src/nix/modules/composition/docker-compose.nix b/src/nix/modules/composition/docker-compose.nix
index 8ff3f62..4537132 100644
--- a/src/nix/modules/composition/docker-compose.nix
+++ b/src/nix/modules/composition/docker-compose.nix
@@ -75,7 +75,7 @@ in
     out.dockerComposeYamlAttrs = config.assertWarn config.docker-compose.raw;
 
     docker-compose.raw = {
-      version = "3.4";
+      version = "3.8";
       services = lib.mapAttrs (k: c: c.out.service) config.services;
       x-arion = config.docker-compose.extended;
       volumes = config.docker-compose.volumes;