diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1a3693a..6825e77 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,9 +3,12 @@ stages:
 
 Build:
   stage: build
-  image: rikorose/gcc-cmake:gcc-7
+  image: $CI_REGISTRY/buildsystems/gcc7_x64
+  tags:
+    - ccache
 
   script:
     - mkdir build -p; cd build
-    - cmake -DCMAKE_BUILD_TYPE=Release ../
-    - cmake --build . -- -j14
+    - cmake -GNinja -DCMAKE_BUILD_TYPE=Release ../
+    - cmake --build .
+    - ccache -s
diff --git a/cmake/install_deps.sh b/cmake/install_deps.sh
index df83721..dc7c021 100755
--- a/cmake/install_deps.sh
+++ b/cmake/install_deps.sh
@@ -61,7 +61,7 @@ ${CMAKE_COMMAND} -G"${CMAKE_GENERATOR}" ../sqlpp11-connector-postgresql\
     -DCMAKE_PREFIX_PATH="${CMAKE_PREFIX_PATH}"\
     -DCMAKE_BUILD_TYPE="${CMAKE_BUILD_TYPE}"\
     -DENABLE_TESTS=FALSE
-${CMAKE_COMMAND} --build . --target install -- -j$(nproc)
+${CMAKE_COMMAND} --build . --target install
 cd ../
 
 echo "building wt"
@@ -111,7 +111,7 @@ ${CMAKE_COMMAND} -G"${CMAKE_GENERATOR}" \
     -DENABLE_OPENGL=OFF\
     -DENABLE_UNWIND=OFF\
     -DCONNECTOR_FCGI=OFF
-${CMAKE_COMMAND} --build . --target install -- -j$(nproc)
+${CMAKE_COMMAND} --build . --target install
 cd ../
 
 echo "building ChaiScript"