diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a5ec0bb5..f6a824ec 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -29,6 +29,10 @@ jobs:
         sudo apt-get install -y catch2
         echo "::endgroup"
 
+        echo "::group::install eigen3"
+        sudo apt-get install  -y eigen3-dev
+        echo "::endgroup"
+
         #echo "::group::install pybind11"
         #sudo apt-get install -y pybind11-dev
         #echo "::endgroup"