diff --git a/Cargo.lock b/Cargo.lock
index be481c4..8bee3a2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -953,8 +953,8 @@ dependencies = [
 
 [[package]]
 name = "ndc-models"
-version = "0.1.3"
-source = "git+http://github.com/hasura/ndc-spec.git?tag=v0.1.3#b9316d206a6aece470531937f6e1ea9223e88122"
+version = "0.1.4"
+source = "git+http://github.com/hasura/ndc-spec.git?tag=v0.1.4#20172e3b2552b78d16dbafcd047f559ced420309"
 dependencies = [
  "indexmap 2.2.6",
  "schemars",
@@ -965,7 +965,7 @@ dependencies = [
 
 [[package]]
 name = "ndc-sdk"
-version = "0.1.3"
+version = "0.1.4"
 dependencies = [
  "async-trait",
  "axum",
@@ -998,8 +998,8 @@ dependencies = [
 
 [[package]]
 name = "ndc-test"
-version = "0.1.3"
-source = "git+http://github.com/hasura/ndc-spec.git?tag=v0.1.3#b9316d206a6aece470531937f6e1ea9223e88122"
+version = "0.1.4"
+source = "git+http://github.com/hasura/ndc-spec.git?tag=v0.1.4#20172e3b2552b78d16dbafcd047f559ced420309"
 dependencies = [
  "async-trait",
  "clap",
diff --git a/Cargo.toml b/Cargo.toml
index 3087cf3..b1cf187 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [workspace]
 resolver = "2"
 
-package.version = "0.1.3"
+package.version = "0.1.4"
 package.edition = "2021"
 package.license = "Apache-2.0"
 
diff --git a/crates/sdk/Cargo.toml b/crates/sdk/Cargo.toml
index 4923864..451ca0e 100644
--- a/crates/sdk/Cargo.toml
+++ b/crates/sdk/Cargo.toml
@@ -24,8 +24,8 @@ rustls = ["reqwest/rustls"]
 ndc-test = ["dep:ndc-test"]
 
 [dependencies]
-ndc-models = { git = "http://github.com/hasura/ndc-spec.git", tag = "v0.1.3" }
-ndc-test = { git = "http://github.com/hasura/ndc-spec.git", tag = "v0.1.3", optional = true }
+ndc-models = { git = "http://github.com/hasura/ndc-spec.git", tag = "v0.1.4" }
+ndc-test = { git = "http://github.com/hasura/ndc-spec.git", tag = "v0.1.4", optional = true }
 
 async-trait = "0.1.79"
 axum = { version = "0.6.20", features = ["http2"] }
diff --git a/crates/sdk/src/connector/example.rs b/crates/sdk/src/connector/example.rs
index dd19b31..ce7486a 100644
--- a/crates/sdk/src/connector/example.rs
+++ b/crates/sdk/src/connector/example.rs
@@ -50,7 +50,7 @@ impl Connector for Example {
 
     async fn get_capabilities() -> JsonResponse<models::CapabilitiesResponse> {
         models::CapabilitiesResponse {
-            version: "0.1.3".into(),
+            version: "0.1.4".into(),
             capabilities: models::Capabilities {
                 relationships: None,
                 query: models::QueryCapabilities {
@@ -60,6 +60,7 @@ impl Connector for Example {
                     nested_fields: models::NestedFieldCapabilities {
                         filter_by: None,
                         order_by: None,
+                        aggregates: None,
                     },
                 },
                 mutation: models::MutationCapabilities {
@@ -122,3 +123,31 @@ impl Connector for Example {
         todo!()
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use std::error::Error;
+    use std::path::PathBuf;
+
+    use axum_test_helper::TestClient;
+    use http::StatusCode;
+
+    use super::*;
+
+    #[tokio::test]
+    async fn capabilities_match_ndc_spec_version() -> Result<(), Box<dyn Error + Send + Sync>> {
+        let state =
+            crate::default_main::init_server_state(Example::default(), PathBuf::new()).await?;
+        let app = crate::default_main::create_router::<Example>(state, None);
+
+        let client = TestClient::new(app);
+        let response = client.get("/capabilities").send().await;
+
+        assert_eq!(response.status(), StatusCode::OK);
+
+        let body: ndc_models::CapabilitiesResponse = response.json().await;
+        // ideally we would get this version from `ndc_models::VERSION`
+        assert_eq!(body.version, "0.1.4");
+        Ok(())
+    }
+}
diff --git a/flake.lock b/flake.lock
index 2bbfe00..1eaaa44 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,16 +2,14 @@
   "nodes": {
     "crane": {
       "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
+        "nixpkgs": ["nixpkgs"]
       },
       "locked": {
-        "lastModified": 1712681629,
-        "narHash": "sha256-bMDXn4AkTXLCpoZbII6pDGoSeSe9gI87jxPsHRXgu/E=",
+        "lastModified": 1715274763,
+        "narHash": "sha256-3Iv1PGHJn9sV3HO4FlOVaaztOxa9uGLfOmUWrH7v7+A=",
         "owner": "ipetkov",
         "repo": "crane",
-        "rev": "220387ac8e99cbee0ca4c95b621c4bc782b6a235",
+        "rev": "27025ab71bdca30e7ed0a16c88fd74c5970fc7f5",
         "type": "github"
       },
       "original": {
@@ -40,11 +38,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1712742472,
-        "narHash": "sha256-EVubu9UGPhayvDit0KYKysZiXUo2BRyd6v7bNoCfkrI=",
+        "lastModified": 1715859993,
+        "narHash": "sha256-vLp62qr+t+Kzp4HsLgIlSiGaBF4R28VPUasWhF1RCnA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f9cee3306b1c7b94459e03cefc94f522f74d4f11",
+        "rev": "2eef017af08b91e353849dfe58436684e169b71d",
         "type": "github"
       },
       "original": {
@@ -63,19 +61,15 @@
     },
     "rust-overlay": {
       "inputs": {
-        "flake-utils": [
-          "flake-utils"
-        ],
-        "nixpkgs": [
-          "nixpkgs"
-        ]
+        "flake-utils": ["flake-utils"],
+        "nixpkgs": ["nixpkgs"]
       },
       "locked": {
-        "lastModified": 1712715149,
-        "narHash": "sha256-uOx7GaLV+5hekAYtm/CBr627Pi7+d1Yh70hwKmVjYYo=",
+        "lastModified": 1715825775,
+        "narHash": "sha256-7np2/EEr5Xm8IuKWQ43q8AA1Lb6Us2BW6rYMxGrInIg=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "9ef1eca23bee5fb8080863909af3802130b2ee57",
+        "rev": "55f468b3d49c5d3321e85f2f9b1158476a2a90fb",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index a526f9c..737bbea 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,7 +7,7 @@
 # the line, `use flake`.
 
 {
-  description = "ndc-hub";
+  description = "ndc-sdk-rs";
 
   inputs = {
     flake-utils.url = "github:numtide/flake-utils";
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 7abec8a..71eb619 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
-channel = "1.77.2"
+channel = "1.78.0"
 profile = "default"  # see https://rust-lang.github.io/rustup/concepts/profiles.html
 components = ["rust-analyzer", "rust-src"]  # see https://rust-lang.github.io/rustup/concepts/components.html