diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 338f307..a77fc2e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -204,6 +204,21 @@ jobs:
             compiler_name: "gcc"
             compiler_version: "12"
 
+          - prefix: "Linux"
+            os: "ubuntu-latest"
+            container:
+              image: "ghcr.io/dnkpp/gcc:11"
+            compiler_name: "gcc"
+            compiler_version: "11"
+
+          - prefix: "Linux"
+            os: "ubuntu-latest"
+            container:
+              image: "ghcr.io/dnkpp/gcc:10"
+            compiler_name: "gcc"
+            compiler_version: "10"
+            compat_source_loc: true
+
           # msvc
           - prefix: "Windows 2022"
             os: "windows-2022"
@@ -244,6 +259,11 @@ jobs:
               compiler_name: "clang"
               compiler_version: "16"
               libcxx: false
+          # gcc-10 doesn't know C++-23
+          - cxx_standard: 23
+            config:
+              compiler_name: "gcc"
+              compiler_version: "10"
           # seems like macOS doesn't support 32bit builds
           - architecture: "32bit"
             config:
@@ -268,6 +288,12 @@ jobs:
                                           -D CTNP_CXX_STANDARD="${{ matrix.cxx_standard }}" \
                                       )" >> $GITHUB_ENV
 
+      - name: Setup compatibility source-location option
+        if: ${{ matrix.config.compat_source_loc }}
+        shell: bash
+        run: |
+          echo "CMAKE_BASE_OPTIONS=$(echo ${CMAKE_BASE_OPTIONS} -DCTNP_TESTING_COMPAT_SOURCE_LOC=ON)" >> $GITHUB_ENV
+
       - name: Setup macOS
         if: startsWith(matrix.config.os, 'macOS')
         shell: bash
diff --git a/include/ctnp/config/Config.hpp b/include/ctnp/config/Config.hpp
index 91115a3..85b2fca 100644
--- a/include/ctnp/config/Config.hpp
+++ b/include/ctnp/config/Config.hpp
@@ -8,9 +8,20 @@
 
 #pragma once
 
+#include <version>
+
 #ifndef CTNP_ASSERT
 	#include <cassert>
 	#define CTNP_ASSERT(condition, msg, ...) assert((condition) && msg)
 #endif
 
+// clang-format off
+// Prevent number from getting decorated with '.
+#if 201907L <= __cpp_lib_constexpr_vector
+    // clang-format on
+    #define CTNP_DETAIL_CONSTEXPR_VECTOR constexpr
+#else
+    #define CTNP_DETAIL_CONSTEXPR_VECTOR inline
+#endif
+
 #endif
diff --git a/include/ctnp/parsing/Reductions.hpp b/include/ctnp/parsing/Reductions.hpp
index 732782e..a2f7f94 100644
--- a/include/ctnp/parsing/Reductions.hpp
+++ b/include/ctnp/parsing/Reductions.hpp
@@ -157,7 +157,7 @@ namespace ctnp::parsing
             return true;
         }
 
-        constexpr bool try_reduce_as_arg_sequence(TokenStack& tokenStack)
+        CTNP_DETAIL_CONSTEXPR_VECTOR bool try_reduce_as_arg_sequence(TokenStack& tokenStack)
         {
             std::span pendingTokens{tokenStack};
             if (std::optional suffix = match_suffix<ArgSequence, ArgSeparator, Type>(pendingTokens))
@@ -228,7 +228,7 @@ namespace ctnp::parsing
             return true;
         }
 
-        constexpr bool try_reduce_as_function_context(TokenStack& tokenStack)
+        CTNP_DETAIL_CONSTEXPR_VECTOR bool try_reduce_as_function_context(TokenStack& tokenStack)
         {
             std::span pendingTokens{tokenStack};
             if (!is_suffix_of<ClosingParens>(pendingTokens))
diff --git a/include/ctnp/parsing/Tokens.hpp b/include/ctnp/parsing/Tokens.hpp
index 54bf0a2..8bc07d7 100644
--- a/include/ctnp/parsing/Tokens.hpp
+++ b/include/ctnp/parsing/Tokens.hpp
@@ -187,7 +187,7 @@ namespace ctnp::parsing::token
         bool isNoexcept{false};
 
         [[nodiscard]]
-        constexpr bool has_ptr() const noexcept
+        CTNP_DETAIL_CONSTEXPR_VECTOR bool has_ptr() const noexcept
         {
             return 1u < layers.size();
         }
@@ -233,18 +233,18 @@ namespace ctnp::parsing::token
     public:
         std::vector<Type> types;
 
-        constexpr ~ArgSequence() noexcept;
-        constexpr ArgSequence();
-        constexpr ArgSequence(ArgSequence const&);
-        constexpr ArgSequence& operator=(ArgSequence const&);
-        constexpr ArgSequence(ArgSequence&&) noexcept;
-        constexpr ArgSequence& operator=(ArgSequence&&) noexcept;
+        CTNP_DETAIL_CONSTEXPR_VECTOR ~ArgSequence() noexcept;
+        CTNP_DETAIL_CONSTEXPR_VECTOR ArgSequence();
+        CTNP_DETAIL_CONSTEXPR_VECTOR ArgSequence(ArgSequence const&);
+        CTNP_DETAIL_CONSTEXPR_VECTOR ArgSequence& operator=(ArgSequence const&);
+        CTNP_DETAIL_CONSTEXPR_VECTOR ArgSequence(ArgSequence&&) noexcept;
+        CTNP_DETAIL_CONSTEXPR_VECTOR ArgSequence& operator=(ArgSequence&&) noexcept;
 
         template <parser_visitor Visitor>
-        constexpr void operator()(Visitor& visitor) const;
+        CTNP_DETAIL_CONSTEXPR_VECTOR void operator()(Visitor& visitor) const;
 
         template <parser_visitor Visitor>
-        constexpr void handle_as_template_args(Visitor& visitor) const;
+        CTNP_DETAIL_CONSTEXPR_VECTOR void handle_as_template_args(Visitor& visitor) const;
     };
 
     class Identifier
@@ -563,15 +563,15 @@ namespace ctnp::parsing::token
         }
     };
 
-    constexpr ArgSequence::~ArgSequence() noexcept = default;
-    constexpr ArgSequence::ArgSequence() = default;
-    constexpr ArgSequence::ArgSequence(ArgSequence const&) = default;
-    constexpr ArgSequence& ArgSequence::operator=(ArgSequence const&) = default;
-    constexpr ArgSequence::ArgSequence(ArgSequence&&) noexcept = default;
-    constexpr ArgSequence& ArgSequence::operator=(ArgSequence&&) noexcept = default;
+    CTNP_DETAIL_CONSTEXPR_VECTOR ArgSequence::~ArgSequence() noexcept = default;
+    CTNP_DETAIL_CONSTEXPR_VECTOR ArgSequence::ArgSequence() = default;
+    CTNP_DETAIL_CONSTEXPR_VECTOR ArgSequence::ArgSequence(ArgSequence const&) = default;
+    CTNP_DETAIL_CONSTEXPR_VECTOR ArgSequence& ArgSequence::operator=(ArgSequence const&) = default;
+    CTNP_DETAIL_CONSTEXPR_VECTOR ArgSequence::ArgSequence(ArgSequence&&) noexcept = default;
+    CTNP_DETAIL_CONSTEXPR_VECTOR ArgSequence& ArgSequence::operator=(ArgSequence&&) noexcept = default;
 
     template <parser_visitor Visitor>
-    constexpr void ArgSequence::operator()(Visitor& visitor) const
+    CTNP_DETAIL_CONSTEXPR_VECTOR void ArgSequence::operator()(Visitor& visitor) const
     {
         if (!types.empty())
         {
@@ -588,7 +588,7 @@ namespace ctnp::parsing::token
     }
 
     template <parser_visitor Visitor>
-    constexpr void ArgSequence::handle_as_template_args(Visitor& visitor) const
+    CTNP_DETAIL_CONSTEXPR_VECTOR void ArgSequence::handle_as_template_args(Visitor& visitor) const
     {
         auto& unwrapped = unwrap_visitor(visitor);
 
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index cef295e..5c2968f 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -18,8 +18,7 @@ add_executable(${TARGET_NAME}
 
 add_subdirectory("parsing")
 
-target_include_directories(${TARGET_NAME}
-    PRIVATE
+target_include_directories(${TARGET_NAME} PRIVATE
     "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}>"
 )
 
@@ -27,8 +26,7 @@ include(CTNP-EnableWarnings)
 include(CTNP-EnableAdditionalFlags)
 find_package(Catch2 REQUIRED)
 find_package(mimicpp REQUIRED)
-target_link_libraries(${TARGET_NAME}
-    PRIVATE
+target_link_libraries(${TARGET_NAME} PRIVATE
     ctnp::ctnp
     ctnp::internal::enable-warnings
     ctnp::internal::enable-additional-flags
@@ -37,8 +35,24 @@ target_link_libraries(${TARGET_NAME}
     Catch2::Catch2WithMain
 )
 
-target_precompile_headers(${TARGET_NAME}
-    PRIVATE
+option(CTNP_TESTING_COMPAT_SOURCE_LOC "" OFF)
+message(DEBUG "${MESSAGE_PREFIX} CTNP_TESTING_COMPAT_SOURCE_LOC: ${CTNP_TESTING_COMPAT_SOURCE_LOC}")
+if (CTNP_TESTING_COMPAT_SOURCE_LOC)
+
+    set(SOURCE_LOCATION_BUILD_TESTS OFF)
+    CPMAddPackage("gh:paweldac/source_location@0.4")
+
+    target_link_libraries(${TARGET_NAME} PRIVATE
+        nostd::source_location
+    )
+
+    target_compile_definitions(${TARGET_NAME} PRIVATE
+        "MIMICPP_CONFIG_ALTERNATIVE_SOURCE_LOCATION_BACKEND=nostd::source_location"
+    )
+endif ()
+
+target_precompile_headers(${TARGET_NAME} PRIVATE
+    "$<$<BOOL:${CTNP_TESTING_COMPAT_SOURCE_LOC}>:<mimic++/compatibility/paweldac-source_location.hpp$<ANGLE-R>>"
     <mimic++/mimic++.hpp>
     "Catch2FallbackStringifier.hpp"
     <catch2/catch_all.hpp>
diff --git a/tests/cmake/Findmimicpp.cmake b/tests/cmake/Findmimicpp.cmake
index 832abdb..84f1b7e 100644
--- a/tests/cmake/Findmimicpp.cmake
+++ b/tests/cmake/Findmimicpp.cmake
@@ -5,13 +5,13 @@
 
 include(get_cpm)
 
+set(MIMICPP_CONFIG_USE_FMT ON)
+set(MIMICPP_CONFIG_EXPERIMENTAL_STACKTRACE ON)
+set(MIMICPP_CONFIG_EXPERIMENTAL_USE_CPPTRACE ON)
 CPMAddPackage(mimicpp
-	VERSION 7
+	#VERSION 7
+    GIT_TAG 779085478419edfc23c5e254db1f51586c771b9e # commit from 20.06.2025
 	GITHUB_REPOSITORY DNKpp/mimicpp
 	SYSTEM YES
 	EXCLUDE_FROM_ALL YES
-	OPTIONS
-	"MIMICPP_CONFIG_USE_FMT ON"
-	#"MIMICPP_CONFIG_EXPERIMENTAL_STACKTRACE ON"
-	#"MIMICPP_CONFIG_EXPERIMENTAL_USE_CPPTRACE ON"
 )
diff --git a/tests/cmake/get_cpm.cmake b/tests/cmake/get_cpm.cmake
index 77b333c..8474873 100644
--- a/tests/cmake/get_cpm.cmake
+++ b/tests/cmake/get_cpm.cmake
@@ -2,8 +2,8 @@
 #
 # SPDX-FileCopyrightText: Copyright (c) 2019-2023 Lars Melchior and contributors
 
-set(CPM_DOWNLOAD_VERSION 0.41.0)
-set(CPM_HASH_SUM "e570f03806b9aae2082ca5b950a9e6b3b41ad56972a78a876aedcaad16653116")
+set(CPM_DOWNLOAD_VERSION 0.42.0)
+set(CPM_HASH_SUM "2020b4fc42dba44817983e06342e682ecfc3d2f484a581f11cc5731fbe4dce8a")
 
 if(CPM_SOURCE_CACHE)
   set(CPM_DOWNLOAD_LOCATION "${CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")