diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index e6d9d80..02c8bab 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -36,7 +36,7 @@ jobs:
       - name: Build
         run: |
           phpize
-          ./configure
+          ./configure --enable-code-coverage
           make -j $(nproc)
           sudo make install
           sudo sh -c "echo 'extension=phpy.so' > /etc/php/${PHP_VERSION}/cli/conf.d/90-phpy.ini"
@@ -49,3 +49,18 @@ jobs:
           sudo service redis-server start
           composer install
           composer test
+
+      - name: run coverage
+        shell: bash
+        run: sudo apt-get install lcov &&
+          sudo lcov --directory . --capture --branch-coverage --rc geninfo_unexecuted_blocks=1 --ignore-errors mismatch --output-file coverage.info &&
+          sudo lcov --remove coverage.info '/usr/*' --output-file coverage.info &&
+          sudo lcov --list coverage.info
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./coverage.info
+          fail_ci_if_error: true
+
diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 7c4dabe..ffa3774 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -37,10 +37,24 @@ jobs:
           pwd
       - name: Build
         run: |
-          cmake .
+          cmake . -D CODE_COVERAGE=ON
           make -j $(nproc)
       - name: Run pytest tests
         run: |
           sudo service redis-server start
           pip install pytest
           pytest -v tests/
+
+      - name: run coverage
+        shell: bash
+        run: sudo apt-get install lcov &&
+          sudo lcov --directory . --capture --branch-coverage --rc geninfo_unexecuted_blocks=1 --ignore-errors mismatch --output-file coverage.info &&
+          sudo lcov --remove coverage.info '/usr/*' --output-file coverage.info &&
+          sudo lcov --list coverage.info
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./coverage.info
+          fail_ci_if_error: true
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7d851fb..fb74622 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,26 @@ if (NOT DEFINED PYTHON_CONFIG)
   set(PYTHON_CONFIG "python3-config")
 endif()
 
+# Code Coverage Configuration
+add_library(coverage_config INTERFACE)
+
+option(CODE_COVERAGE "Enable coverage reporting" OFF)
+if(CODE_COVERAGE)
+    message(STATUS "Open coverage")
+    # --coverage => -fprofile-arcs -ftest-coverage
+    target_compile_options(coverage_config INTERFACE
+            -O0
+            -g
+            -fprofile-update=atomic
+            --coverage
+    )
+    if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.13)
+        target_link_options(coverage_config INTERFACE --coverage)
+    else()
+        target_link_libraries(coverage_config INTERFACE --coverage)
+    endif()
+endif(CODE_COVERAGE)
+
 file(GLOB_RECURSE SOURCE_FILES FOLLOW_SYMLINKS src/*.cc)
 
 execute_process(COMMAND ${PHP_CONFIG} --includes
@@ -55,5 +75,9 @@ include_directories(BEFORE ${phpy_includes})
 link_directories(${phpy_link_directories})
 add_library(phpy SHARED ${SOURCE_FILES})
 
+if (CODE_COVERAGE)
+    target_link_libraries(phpy coverage_config gcov)
+endif(CODE_COVERAGE)
+
 set_target_properties(phpy PROPERTIES OUTPUT_NAME "lib/phpy")
 target_link_libraries(phpy ${phpy_libraries})
diff --git a/config.m4 b/config.m4
index a121bac..844912a 100644
--- a/config.m4
+++ b/config.m4
@@ -22,6 +22,11 @@ PHP_ARG_ENABLE([phpy],
     [Enable phpy support])],
   [no])
 
+PHP_ARG_ENABLE([code-coverage],
+  [whether to enable code coverage support],
+  [AS_HELP_STRING([--enable-code-coverage],
+    [Enable code coverage support])], [no], [no])
+
 AC_DEFUN([GET_PYTHON_LDFLAGS], [
   TMP_RESULT="$($PHP_PYTHON_CONFIG --embed --ldflags)"
   if test $? -eq 0; then
@@ -84,6 +89,16 @@ if test "$PHP_PHPY" != "no"; then
   EXTRAS_CXXFLAGS="-Wall -Wno-unused-function -Wno-deprecated -Wno-deprecated-declarations -z now"
   EXTRAS_CXXFLAGS="$EXTRAS_CXXFLAGS -std=c++14"
 
+  AC_MSG_CHECKING([code coverage])
+  if test "$PHP_CODE_COVERAGE" != "no"; then
+    AC_MSG_RESULT([enabled])
+    EXTRAS_CFLAGS="-fprofile-arcs -ftest-cover -fprofile-update=atomic"
+    EXTRAS_CXXFLAGS="-fprofile-arcs -ftest-coverage -fprofile-update=atomic"
+    EXTRA_LDFLAGS="--coverage"
+  else
+    AC_MSG_RESULT([disabled])
+  fi
+
   if test -f "$abs_srcdir/phpy.cc"; then
     phpy_source_dir=$abs_srcdir
   elif test -f "phpy.cc"; then