diff --git a/Cargo.toml b/Cargo.toml
index 4ce85d7..719ff37 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,21 +13,21 @@ autobenches = false
 bench = false
 
 [features]
-default = [ "std" ]
+default = ["std"]
 std = []
 
 [dependencies]
 smallvec = "1"
 robust = "1.1.0"
 num-traits = "0.2"
-hashbrown  = "0.14.2"
+hashbrown = "0.14.2"
 
 [dependencies.serde]
 package = "serde"
 optional = true
-version = "1"
+version = "1.0.0"
 default-features = false
-features = [ "derive", "alloc" ]
+features = ["derive", "alloc"]
 
 [workspace]
 members = ["delaunay_compare"]
diff --git a/src/cdt.rs b/src/cdt.rs
index 3849051..acbf1e3 100644
--- a/src/cdt.rs
+++ b/src/cdt.rs
@@ -67,20 +67,6 @@ impl<UE> AsMut<UE> for CdtEdge<UE> {
     }
 }
 
-impl<'a, V, DE, UE, F> UndirectedEdgeHandle<'a, V, DE, CdtEdge<UE>, F> {
-    /// Returns `true` if this edge is a constraint edge.
-    pub fn is_constraint_edge(&self) -> bool {
-        self.data().is_constraint_edge()
-    }
-}
-
-impl<'a, V, DE, UE, F> DirectedEdgeHandle<'a, V, DE, CdtEdge<UE>, F> {
-    /// Returns `true` if this edge is a constraint edge.
-    pub fn is_constraint_edge(&self) -> bool {
-        self.as_undirected().data().is_constraint_edge()
-    }
-}
-
 /// A two dimensional
 /// [constrained Delaunay triangulation](https://en.wikipedia.org/wiki/Constrained_Delaunay_triangulation).
 ///
diff --git a/src/delaunay_core/refinement.rs b/src/delaunay_core/refinement.rs
index 13f3cb4..04834e2 100644
--- a/src/delaunay_core/refinement.rs
+++ b/src/delaunay_core/refinement.rs
@@ -1,5 +1,7 @@
 use std::collections::{HashMap, HashSet, VecDeque};
 
+use alloc::vec::Vec;
+
 use num_traits::Float;
 
 use crate::{
@@ -940,7 +942,7 @@ mod test {
     #[test]
     fn test_zero_angle_limit_dbg() {
         let limit = AngleLimit::from_deg(0.0);
-        let debug_string = format!("{:?}", limit);
+        let debug_string = alloc::format!("{:?}", limit);
         assert_eq!(debug_string, "AngleLimit { angle limit (deg): 0.0 }");
     }
 
diff --git a/src/delaunay_core/refinement_fuzz_tests.rs b/src/delaunay_core/refinement_fuzz_tests.rs
index 62ee38a..ce399eb 100644
--- a/src/delaunay_core/refinement_fuzz_tests.rs
+++ b/src/delaunay_core/refinement_fuzz_tests.rs
@@ -3,6 +3,9 @@ use crate::{
     TriangulationExt,
 };
 
+use alloc::vec;
+use alloc::vec::Vec;
+
 fn refinement_parameters() -> RefinementParameters<f64> {
     RefinementParameters::new().with_max_additional_vertices(1000)
 }