diff --git a/arion-compose/service-e2e-testing.nix b/arion-compose/service-e2e-testing.nix
index c1a67cf5..50c2778e 100644
--- a/arion-compose/service-e2e-testing.nix
+++ b/arion-compose/service-e2e-testing.nix
@@ -4,10 +4,19 @@
 }:
 
 let
+  v3-e2e-testing-source = builtins.fetchGit {
+    url = "git+ssh://git@github.com/hasura/v3-e2e-testing?ref=jesse/update-mongodb";
+    name = "v3-e2e-testing-source";
+    ref = "jesse/update-mongodb";
+    rev = "325240c938c253a21f2fe54161b0c94e54f1a3a5";
+  };
+
+  v3-e2e-testing = pkgs.pkgsCross.linux.callPackage ../nix/v3-e2e-testing.nix { src = v3-e2e-testing-source; database-to-test = "mongodb"; };
+
   e2e-testing-service = {
     useHostStore = true;
     command = [
-      "${pkgs.pkgsCross.linux.v3-e2e-testing}/bin/v3-e2e-testing-mongodb"
+      "${v3-e2e-testing}/bin/v3-e2e-testing-mongodb"
     ];
     environment = pkgs.lib.optionalAttrs (engine-graphql-url != null) {
       ENGINE_GRAPHQL_URL = engine-graphql-url;
diff --git a/flake.lock b/flake.lock
index 5344b876..7bedd213 100644
--- a/flake.lock
+++ b/flake.lock
@@ -231,8 +231,7 @@
         "graphql-engine-source": "graphql-engine-source",
         "nixpkgs": "nixpkgs",
         "rust-overlay": "rust-overlay",
-        "systems": "systems_2",
-        "v3-e2e-testing-source": "v3-e2e-testing-source"
+        "systems": "systems_2"
       }
     },
     "rust-overlay": {
@@ -285,23 +284,6 @@
         "repo": "default",
         "type": "github"
       }
-    },
-    "v3-e2e-testing-source": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1706578034,
-        "narHash": "sha256-DkbumGH6W51qs4pHpEE972pUfyUiGfZFFNitv8p6DaQ=",
-        "ref": "jesse/update-mongodb",
-        "rev": "325240c938c253a21f2fe54161b0c94e54f1a3a5",
-        "revCount": 161,
-        "type": "git",
-        "url": "ssh://git@github.com/hasura/v3-e2e-testing"
-      },
-      "original": {
-        "ref": "jesse/update-mongodb",
-        "type": "git",
-        "url": "ssh://git@github.com/hasura/v3-e2e-testing"
-      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index 63b6f573..42d15834 100644
--- a/flake.nix
+++ b/flake.nix
@@ -52,13 +52,6 @@
       url = "github:hasura/graphql-engine/50f1243a46e22f0fecca03364b0b181fbb3735c6";
       flake = false;
     };
-
-    # See the note above on graphql-engine-source for information on running
-    # against a version of v3-e2e-testing with local changes.
-    v3-e2e-testing-source = {
-      url = "git+ssh://git@github.com/hasura/v3-e2e-testing?ref=jesse/update-mongodb";
-      flake = false;
-    };
   };
 
   outputs =
@@ -70,7 +63,6 @@
     , arion
     , graphql-engine-source
     , dev-auth-webhook-source
-    , v3-e2e-testing-source
     , systems
     , ...
     }:
@@ -100,8 +92,6 @@
           mongodb-connector = final.mongodb-connector-workspace.override { package = "mongodb-connector"; }; # override `package` to build one specific crate
           mongodb-cli-plugin = final.mongodb-connector-workspace.override { package = "mongodb-cli-plugin"; };
           graphql-engine = final.callPackage ./nix/graphql-engine.nix { src = "${graphql-engine-source}/v3"; package = "engine"; };
-          v3-e2e-testing = final.callPackage ./nix/v3-e2e-testing.nix { src = v3-e2e-testing-source; database-to-test = "mongodb"; };
-          inherit v3-e2e-testing-source; # include this source so we can read files from it in arion-compose configs
           dev-auth-webhook = final.callPackage ./nix/dev-auth-webhook.nix { src = "${dev-auth-webhook-source}/v3/crates/hasura-authn-webhook/dev-auth-webhook"; };
 
           # Provide cross-compiled versions of each of our packages under