From a865750c4fb65d8435dd51012097646631b22e0e Mon Sep 17 00:00:00 2001
From: Simone Carlo Surace <51025924+simsurace@users.noreply.github.com>
Date: Fri, 6 Oct 2023 13:37:12 +0200
Subject: [PATCH 1/2] Try to fix Matern AD failures

---
 src/basekernels/matern.jl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/basekernels/matern.jl b/src/basekernels/matern.jl
index cb051ee0f..c009bf596 100644
--- a/src/basekernels/matern.jl
+++ b/src/basekernels/matern.jl
@@ -41,7 +41,8 @@ MaternKernel(; nu::Real=1.5, ν::Real=nu, metric=Euclidean()) = MaternKernel(ν,
 
 function _matern(ν::Real, d::Real)
     if iszero(d)
-        return one(d)
+        c = -ν / (ν - 1)
+        return one(d) + c * d^2 / 2
     else
         y = sqrt(2ν) * d
         b = log(besselk(ν, y))

From c1eac30c9add30a60e22f568dbe523718a62fa69 Mon Sep 17 00:00:00 2001
From: Simone Carlo Surace <51025924+simsurace@users.noreply.github.com>
Date: Mon, 23 Oct 2023 15:40:27 +0200
Subject: [PATCH 2/2] Bump version

---
 Project.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Project.toml b/Project.toml
index 3986c1f59..51730c377 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "KernelFunctions"
 uuid = "ec8451be-7e33-11e9-00cf-bbf324bd1392"
-version = "0.10.58"
+version = "0.10.59"
 
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"