diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a1350bf7..f4c15ee4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,7 @@ jobs:
     - name: Install Python dependencies
       run: python -m pip install --prefer-binary cython>=0.28 ${{ matrix.numpy-version }} scipy matplotlib "pyopencl[pocl]>=2022.2.4"
     - name: Install Raysect from pypi
-      run: pip install raysect==0.7.1
+      run: pip install raysect==0.8.1
     - name: Build cherab
       run: dev/build.sh
     - name: Run tests
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ae0a7d3..0a17fd37 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,13 @@
 Project Changelog
 =================
 
+Release 1.5.0 (TBD)
+-------------------
+
+New:
+* Support Raysect 0.8
+
+
 Release 1.4.0 (3 Feb 2023)
 -------------------
 
diff --git a/cherab/core/VERSION b/cherab/core/VERSION
index 88c5fb89..c831dd27 100644
--- a/cherab/core/VERSION
+++ b/cherab/core/VERSION
@@ -1 +1 @@
-1.4.0
+1.5.0.dev1
diff --git a/cherab/tools/raytransfer/roughconductor.pyx b/cherab/tools/raytransfer/roughconductor.pyx
index 04edf6f2..faef9cf1 100644
--- a/cherab/tools/raytransfer/roughconductor.pyx
+++ b/cherab/tools/raytransfer/roughconductor.pyx
@@ -18,7 +18,7 @@
 # under the Licence.
 #
 
-from raysect.optical cimport Point3D, Vector3D, AffineMatrix3D, World, Ray, Spectrum, new_vector3d
+from raysect.optical cimport Point3D, Vector3D, AffineMatrix3D, World, Ray, Spectrum, new_vector3d, Intersection
 from libc.math cimport M_PI, sqrt
 from raysect.optical.material cimport RoughConductor
 cimport cython
@@ -34,7 +34,8 @@ cdef class RToptimisedRoughConductor(RoughConductor):
     @cython.cdivision(True)
     cpdef Spectrum evaluate_shading(self, World world, Ray ray, Vector3D s_incoming, Vector3D s_outgoing,
                                     Point3D w_reflection_origin, Point3D w_transmission_origin, bint back_face,
-                                    AffineMatrix3D world_to_surface, AffineMatrix3D surface_to_world):
+                                    AffineMatrix3D world_to_surface, AffineMatrix3D surface_to_world,
+                                    Intersection intersection):
 
         cdef:
             double n, k
diff --git a/pyproject.toml b/pyproject.toml
index f896f8f0..ce56ed60 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,3 @@
 [build-system]
-requires = ["setuptools", "wheel", "oldest-supported-numpy", "cython>=0.28", "raysect==0.7.1"]
+requires = ["setuptools", "wheel", "oldest-supported-numpy", "cython>=0.28", "raysect==0.8.1"]
 build-backend="setuptools.build_meta"
diff --git a/requirements.txt b/requirements.txt
index 2b5e7b4e..24a9b6e8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,4 @@ cython>=0.28
 numpy>=1.14
 scipy
 matplotlib
-raysect==0.7.1
\ No newline at end of file
+raysect==0.8.1
diff --git a/setup.py b/setup.py
index d7810f52..476697e8 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@
 
 source_paths = ["cherab", "demos"]
 compilation_includes = [".", numpy.get_include()]
-compilation_args = []
+compilation_args = ["-O3"]
 cython_directives = {"language_level": 3}
 setup_path = path.dirname(path.abspath(__file__))
 
@@ -103,7 +103,7 @@
         "numpy>=1.14",
         "scipy",
         "matplotlib",
-        "raysect==0.7.1",
+        "raysect==0.8.1",
     ],
     packages=find_packages(),
     include_package_data=True,