From 249027388cb418974c3b992b951f1aa607b269aa Mon Sep 17 00:00:00 2001
From: Nathanael Bosch <nathanael.bosch@uni-tuebingen.de>
Date: Thu, 16 Nov 2023 18:40:13 +0100
Subject: [PATCH] Maybe fix the version issue this way?

---
 ext/DiffEqDevToolsExt.jl | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ext/DiffEqDevToolsExt.jl b/ext/DiffEqDevToolsExt.jl
index 51c8f667a..e2e91da58 100644
--- a/ext/DiffEqDevToolsExt.jl
+++ b/ext/DiffEqDevToolsExt.jl
@@ -18,7 +18,11 @@ function chi2(gaussian_estimate, actual_value)
             return convert(eltype(actual_value), Inf)
         end
     end
-    return diff' * (Σ \ diff)
+    @static if VERSION < v"1.6"
+        return diff' * (Matrix(Σ) \ diff)
+    else
+        return diff' * (Σ \ diff)
+    end
 end
 
 function DiffEqDevTools.appxtrue(