diff --git a/CHANGELOG.md b/CHANGELOG.md
index b9dd199..c967e60 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 - Fixes
     - Fix regression in Nix 2.19+ (`devour-flake produced an outpath with no outputs`) (\#35)
     - Evaluate OS configurations for current system only (\#38)
+    - Fail correctly if nixci is passed a missing flake attribute (\#44)
 
 # 0.2.0
 
diff --git a/Cargo.lock b/Cargo.lock
index 101f9dd..4daa0fd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -791,9 +791,9 @@ dependencies = [
 
 [[package]]
 name = "nix_rs"
-version = "0.2.3"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a18f6606788c363ffe0251a1922aa4c3bae819e59696448eaa88a6ac3e38ee28"
+checksum = "73718840161bceeaeacf69be31942bbd034cf52a1801c9cf7a54de4c0aab8c14"
 dependencies = [
  "bytesize",
  "cfg-if",
diff --git a/Cargo.toml b/Cargo.toml
index cc7bd7f..9e5177a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,7 +27,8 @@ reqwest = { version = "0.11", features = ["blocking", "json"] }
 try-guard = "0.2.0"
 clap = { version = "4.4", features = ["derive"] }
 urlencoding = "2.1.3"
-nix_rs = { version = "0.2.3" }
+nix_rs = { version = "0.3.0" }
+# nix_rs = { version = "0.3", path = "../nix-browser/crates/nix_rs" }
 tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }
 tracing = "0.1.37"
 
diff --git a/src/config.rs b/src/config.rs
index 6630a59..a145db4 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -36,7 +36,7 @@ impl Config {
         let (url, attr) = url.split_attr();
         let name = attr.get_name();
         let nixci_url = FlakeUrl(format!("{}#nixci.{}", url.0, name));
-        let cfg = nix_eval_attr_json::<Config>(&nixci_url).await?;
+        let cfg = nix_eval_attr_json::<Config>(&nixci_url, attr.is_none()).await?;
         Ok(((name, cfg), url))
     }
 }