diff --git a/.github/workflows/cpp_ci.yml b/.github/workflows/cpp_ci.yml
index bc21f8b..fb3f979 100644
--- a/.github/workflows/cpp_ci.yml
+++ b/.github/workflows/cpp_ci.yml
@@ -13,6 +13,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
+    - name: downloading and installing Catch2
+      run: git clone https://github.com/catchorg/Catch2.git && cd Catch2 && cmake -Bbuild -H. -DBUILD_TESTING=OFF && sudo cmake --build build/ --target install
     - name: downloading and installing fftw
       run: wget http://www.fftw.org/fftw-3.3.10.tar.gz && tar xzf fftw-3.3.10.tar.gz && cd fftw-3.3.10 && ./configure && make && sudo make install
     - name: downloading and installing Eigen3