diff --git a/Cargo.lock b/Cargo.lock
index 6824503..b269427 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -953,14 +953,16 @@ dependencies = [
 
 [[package]]
 name = "ndc-models"
-version = "0.1.4"
-source = "git+http://github.com/hasura/ndc-spec.git?rev=002923d5c337930b9c9007f05c768fe9a0575612#002923d5c337930b9c9007f05c768fe9a0575612"
+version = "0.1.5"
+source = "git+http://github.com/hasura/ndc-spec.git?tag=v0.1.5#78f52768bd02a8289194078a5abc2432c8e3a758"
 dependencies = [
  "indexmap 2.2.6",
+ "ref-cast",
  "schemars",
  "serde",
  "serde_json",
  "serde_with",
+ "smol_str",
 ]
 
 [[package]]
@@ -998,8 +1000,8 @@ dependencies = [
 
 [[package]]
 name = "ndc-test"
-version = "0.1.4"
-source = "git+http://github.com/hasura/ndc-spec.git?rev=002923d5c337930b9c9007f05c768fe9a0575612#002923d5c337930b9c9007f05c768fe9a0575612"
+version = "0.1.5"
+source = "git+http://github.com/hasura/ndc-spec.git?tag=v0.1.5#78f52768bd02a8289194078a5abc2432c8e3a758"
 dependencies = [
  "async-trait",
  "clap",
@@ -1011,6 +1013,7 @@ dependencies = [
  "semver",
  "serde",
  "serde_json",
+ "smol_str",
  "thiserror",
  "tokio",
  "url",
@@ -1415,6 +1418,26 @@ dependencies = [
  "bitflags 1.3.2",
 ]
 
+[[package]]
+name = "ref-cast"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ccf0a6f84d5f1d581da8b41b47ec8600871962f2a528115b542b362d4b744931"
+dependencies = [
+ "ref-cast-impl",
+]
+
+[[package]]
+name = "ref-cast-impl"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bcc303e793d3734489387d205e9b186fac9c6cfacedd98cbb2e8a5943595f3e6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.55",
+]
+
 [[package]]
 name = "regex"
 version = "1.10.4"
diff --git a/crates/sdk/Cargo.toml b/crates/sdk/Cargo.toml
index 5b8b347..d24abd8 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", rev = "002923d5c337930b9c9007f05c768fe9a0575612"}
-ndc-test = { git = "http://github.com/hasura/ndc-spec.git", rev = "002923d5c337930b9c9007f05c768fe9a0575612", optional = true }
+ndc-models = { git = "http://github.com/hasura/ndc-spec.git", tag = "v0.1.5" }
+ndc-test = { git = "http://github.com/hasura/ndc-spec.git", tag = "v0.1.5", 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 8ad8e01..c173bbc 100644
--- a/crates/sdk/src/connector/example.rs
+++ b/crates/sdk/src/connector/example.rs
@@ -142,8 +142,7 @@ mod tests {
         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");
+        assert_eq!(body.version, ndc_models::VERSION);
         Ok(())
     }
 }