diff --git a/Cargo.lock b/Cargo.lock
index 43de9609..ddc54156 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -214,9 +214,9 @@ dependencies = [
 
 [[package]]
 name = "numpy"
-version = "0.23.0"
+version = "0.22.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b94caae805f998a07d33af06e6a3891e38556051b8045c615470a71590e13e78"
+checksum = "edb929bc0da91a4d85ed6c0a84deaa53d411abfb387fc271124f91bf6b89f14e"
 dependencies = [
  "libc",
  "ndarray",
@@ -278,9 +278,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3"
-version = "0.23.4"
+version = "0.22.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57fe09249128b3173d092de9523eaa75136bf7ba85e0d69eca241c7939c933cc"
+checksum = "f402062616ab18202ae8319da13fa4279883a2b8a9d9f83f20dbade813ce1884"
 dependencies = [
  "cfg-if",
  "indoc",
@@ -297,9 +297,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-build-config"
-version = "0.23.4"
+version = "0.22.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1cd3927b5a78757a0d71aa9dff669f903b1eb64b54142a9bd9f757f8fde65fd7"
+checksum = "b14b5775b5ff446dd1056212d778012cbe8a0fbffd368029fd9e25b514479c38"
 dependencies = [
  "once_cell",
  "target-lexicon",
@@ -307,9 +307,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-ffi"
-version = "0.23.4"
+version = "0.22.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dab6bb2102bd8f991e7749f130a70d05dd557613e39ed2deeee8e9ca0c4d548d"
+checksum = "9ab5bcf04a2cdcbb50c7d6105de943f543f9ed92af55818fd17b660390fc8636"
 dependencies = [
  "libc",
  "pyo3-build-config",
@@ -317,9 +317,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros"
-version = "0.23.4"
+version = "0.22.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91871864b353fd5ffcb3f91f2f703a22a9797c91b9ab497b1acac7b07ae509c7"
+checksum = "0fd24d897903a9e6d80b968368a34e1525aeb719d568dba8b3d4bfa5dc67d453"
 dependencies = [
  "proc-macro2",
  "pyo3-macros-backend",
@@ -329,9 +329,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros-backend"
-version = "0.23.4"
+version = "0.22.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "43abc3b80bc20f3facd86cd3c60beed58c3e2aa26213f3cda368de39c60a27e4"
+checksum = "36c011a03ba1e50152b4b394b479826cad97e7a21eb52df179cd91ac411cbfbe"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -418,9 +418,9 @@ dependencies = [
 
 [[package]]
 name = "rustc-hash"
-version = "2.1.0"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c7fb8039b3032c191086b10f11f319a6e99e1e82889c5cc6046f515c9db1d497"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
 
 [[package]]
 name = "rustversion"
diff --git a/Cargo.toml b/Cargo.toml
index 2ac49160..119165dd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,9 +18,9 @@ crate-type = ["cdylib"]
 [dependencies]
 atomic_float = "1.1.0"
 ndarray = "0.16.1"
-numpy = "0.23.0"
+numpy = "0.22.1"
 petgraph = "0.7.1"
-pyo3 = { version = "0.23.4", features = ["multiple-pymethods"] }
+pyo3 = { version = "0.22.6", features = ["multiple-pymethods"] }
 rand = "0.9.0"
 rand_distr = "0.5.0"
 rayon = "1.7.0"
diff --git a/pyproject.toml b/pyproject.toml
index 3d726509..09c88d3f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "cityseer"
-version = '4.18.0'
+version = '4.18.1'
 description = "Computational tools for network-based pedestrian-scale urban analysis"
 readme = "README.md"
 requires-python = ">=3.10, <3.14"
diff --git a/src/common.rs b/src/common.rs
index 8bdb2ff9..0c68e863 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -81,7 +81,7 @@ impl MetricResult {
                     .collect();
                 let array = Python::with_gil(|py| {
                     vec_f32
-                        .into_pyarray(py)
+                        .into_pyarray_bound(py)
                         .to_owned() // This gives us a PyArray, but wrapped in pyo3::Bound
                         .into() // Convert to the required Py<PyArray> type
                 });
diff --git a/src/viewshed.rs b/src/viewshed.rs
index bdb16457..fc2b1fe1 100644
--- a/src/viewshed.rs
+++ b/src/viewshed.rs
@@ -179,15 +179,15 @@ impl Viewshed {
         // Convert the results back to NumPy arrays
         let array_u32 = Array2::from_shape_vec((height, width), results_u32)
             .unwrap()
-            .into_pyarray(py)
+            .into_pyarray_bound(py)
             .to_owned();
         let array_f32_a = Array2::from_shape_vec((height, width), results_f32_a)
             .unwrap()
-            .into_pyarray(py)
+            .into_pyarray_bound(py)
             .to_owned();
         let array_f32_b = Array2::from_shape_vec((height, width), results_f32_b)
             .unwrap()
-            .into_pyarray(py)
+            .into_pyarray_bound(py)
             .to_owned();
 
         Ok((array_u32.into(), array_f32_a.into(), array_f32_b.into()))
@@ -206,7 +206,7 @@ impl Viewshed {
         let visibility = calculate_viewshed(raster_array, origin_x, origin_y, view_distance);
         let numpy_array = Array2::from_shape_vec((height, width), visibility)
             .unwrap()
-            .into_pyarray(py)
+            .into_pyarray_bound(py)
             .to_owned();
         Ok(numpy_array.into())
     }