diff --git a/.github/workflows/c-linux.yml b/.github/workflows/c-linux.yml
index f2c98a6..584fae2 100644
--- a/.github/workflows/c-linux.yml
+++ b/.github/workflows/c-linux.yml
@@ -14,7 +14,11 @@ jobs:
     name: C/C++ CMake CI Test
     strategy:
       matrix:
-        os: ["ubuntu-24.04"]
+        os:
+          - "ubuntu-24.04"
+          - "ubuntu-24.04-arm"
+          - "ubuntu-26.04"
+          - "ubuntu-26.04-arm"
     runs-on: ${{ matrix.os }}
 
     steps:
diff --git a/.github/workflows/c-macos.yml b/.github/workflows/c-macos.yml
index 6d73627..c8008c2 100644
--- a/.github/workflows/c-macos.yml
+++ b/.github/workflows/c-macos.yml
@@ -14,7 +14,12 @@ jobs:
     name: C/C++ CMake CI Test
     strategy:
       matrix:
-        os: ["macos-14"]
+        os:
+          - "macos-14"
+          - "macos-15"
+          - "macos-15-intel"
+          - "macos-26"
+          - "macos-26-intel"
     runs-on: ${{ matrix.os }}
 
     steps:
diff --git a/.github/workflows/c-windows.yml b/.github/workflows/c-windows.yml
index 9277d0d..3ec29fe 100644
--- a/.github/workflows/c-windows.yml
+++ b/.github/workflows/c-windows.yml
@@ -14,7 +14,7 @@ jobs:
     name: C/C++ CMake CI Test
     strategy:
       matrix:
-        os: ["windows-2022"]
+        os: ["windows-2022", "windows-2025"]
         arch:
           - amd64
           - amd64_x86
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 29db9a4..c2f535b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,8 +16,15 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-SET(GCC_COVERAGE_COMPILE_FLAGS "-fsanitize=address -fprofile-arcs -ftest-coverage -g -O0 -save-temps")
-SET(GCC_COVERAGE_LINK_FLAGS "--coverage")
+# -fsanitize=address causes SIGILL on macOS (Clang 17 + macOS 26 Intel) due to
+# ASan runtime incompatibility. Coverage instrumentation still works without it.
+if(APPLE)
+  SET(GCC_COVERAGE_COMPILE_FLAGS "-fprofile-arcs -ftest-coverage -g -O0 -save-temps")
+  SET(GCC_COVERAGE_LINK_FLAGS "--coverage")
+else()
+  SET(GCC_COVERAGE_COMPILE_FLAGS "-fsanitize=address -fprofile-arcs -ftest-coverage -g -O0 -save-temps")
+  SET(GCC_COVERAGE_LINK_FLAGS "--coverage")
+endif()
 
 if (CMAKE_GENERATOR MATCHES "Unix Makefiles")