From 1084b262a8d4fd9ae8e44b112fc7fdd671ee85a1 Mon Sep 17 00:00:00 2001
From: Oliver Lantwin <oliver.lantwin@cern.ch>
Date: Thu, 19 Feb 2026 08:23:31 +0100
Subject: [PATCH] feat: move to C++20

---
 CHANGELOG.md        | 1 +
 defaults-release.sh | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c3c1cd9..0c4efa37 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ Until May 2022 (inclusive) no changelog was kept. We might try to reconstruct it
 
 * defaults-actstracking: Removed all overrides unrelated to ACTS or C++20.
 * ACTS: Disabled all GEANT4 build options required for examples.
+* Move to C++20
 
 ### Removed
 
diff --git a/defaults-release.sh b/defaults-release.sh
index 7c2aaf29..370a432c 100644
--- a/defaults-release.sh
+++ b/defaults-release.sh
@@ -1,10 +1,10 @@
 package: defaults-release
 version: v1
 env:
-  CXXFLAGS: "-fPIC -g -O2 -std=c++17"
+  CXXFLAGS: "-fPIC -g -O2 -std=c++20"
   CFLAGS: "-fPIC -g -O2"
   CMAKE_BUILD_TYPE: "RELEASE"
-  CMAKE_CXX_STANDARD: "17"
+  CMAKE_CXX_STANDARD: "20"
 ---
 # This file is included in any build recipe and it's only used to set
 # environment variables. Which file to actually include can be defined by the