diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a756713d3ee088060581db98b68f07e9d38ef87c..4442a8979833e39975393dbe8bf4d33cf0a9b28d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -24,33 +24,11 @@ build-img:
   image: $CI_REGISTRY_IMAGE:latest
   needs: ['build-img']
   script:
-    - git clone --depth 1 --branch v2.13.7 https://github.com/catchorg/Catch2
-    - cmake -SCatch2 -Bbuild-catch2 -GNinja
-    - cmake --build build-catch2 --target install
+    - conan install -if build -g cmake_find_package catch2/2.13.7@
+    - conan install -if build -g cmake_find_package cgal/5.2.1@
+    - conan install -if build -g cmake_find_package taocpp-pegtl/3.2.1@
 
-    - wget https://gmplib.org/download/gmp/gmp-6.2.1.tar.lz
-    - tar xf gmp-6.2.1.tar.lz
-    - pushd gmp-6.2.1
-    - ./configure
-    - make install
-    - popd
-
-    - wget https://www.mpfr.org/mpfr-current/mpfr-4.1.0.tar.xz
-    - tar xf mpfr-4.1.0.tar.xz
-    - pushd mpfr-4.1.0
-    - ./configure
-    - make install
-    - popd
-
-    - git clone --depth 1 --branch v5.3 https://github.com/CGAL/cgal
-    - cmake -Scgal -Bbuild-cgal -GNinja
-    - cmake --build build-cgal --target install
-
-    - git clone --branch 3.2.2 https://github.com/taocpp/PEGTL
-    - cmake -SPEGTL -Bbuild-pegtl -GNinja
-    - cmake --build build-pegtl --target install
-
-    - cmake -S. -Bbuild -GNinja -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+    - cmake -S. -Bbuild -GNinja -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DCMAKE_MODULE_PATH=$PWD/build
     - cmake --build build --target unit_tests_csg
     - cd build
     - ctest
diff --git a/Dockerfile b/Dockerfile
index 74517398c5d73c46be2de26c2b6871622da88233..54085aebbff56126c275e978c9b81b72d40530b8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,21 +8,17 @@ ENV DEBIAN_FRONTEND noninteractive
 
 RUN apt-get -qq update \
   && apt-get -qq -y install --no-install-recommends \
-  autoconf=2.* \
   build-essential=12.* \
   git=1:2.* \
-  libboost-all-dev=1.* \
-  lunzip=1.* \
-  m4=1.* \
   openscad=2019.* \
   pkg-config=0.29.* \
   python3-pip=20.* \
   python3-venv=3.8.* \
-  wget=1.* \
   && apt-get clean && rm -rf /var/lib/apt/lists/* \
 
   && pip3 install --no-cache-dir \
   cmake==3.* \
+  conan==1.* \
   ninja==1.*
 
 CMD [ "/bin/bash" ]
diff --git a/src/csg/CMakeLists.txt b/src/csg/CMakeLists.txt
index 93513bf9cf5a486ca186d15a06e1a933e67138b9..bcf3a9b78a3b1fe6c5cc854bb848bb2617d0818c 100644
--- a/src/csg/CMakeLists.txt
+++ b/src/csg/CMakeLists.txt
@@ -13,6 +13,7 @@ add_library(csg-eb
   )
 
 target_link_libraries(csg-eb PRIVATE
+                      CGAL::CGAL
                       stdc++fs
                       taocpp::pegtl
                       )
diff --git a/src/csg/tests/CMakeLists.txt b/src/csg/tests/CMakeLists.txt
index f4b7dde4b0187e2bd58dcee99731f5b053d735b8..7041326235fcae5353f30bb3b253883c1dcd57d6 100644
--- a/src/csg/tests/CMakeLists.txt
+++ b/src/csg/tests/CMakeLists.txt
@@ -28,8 +28,9 @@ target_include_directories(unit_tests_csg
 find_package(Catch2 REQUIRED)
 include(Catch)
 target_link_libraries(unit_tests_csg
-  csg-eb
+  CGAL::CGAL
   Catch2::Catch2
+  csg-eb
   )
 
 catch_discover_tests(unit_tests_csg)