diff --git a/.circleci/config.yml b/.circleci/config.yml
index f909f78..a4f0383 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -5,5 +5,5 @@ jobs:
       - image: purplekarrot/gcc-8
     steps:
       - checkout
-      - run: sudo apt-get update && sudo apt-get install doxygen doxygen-docs doxygen-latex doxygen-gui graphviz
+      - run: apt-get update && apt-get install -y doxygen doxygen-docs doxygen-latex doxygen-gui graphviz
       - run: cd build && cmake -DCMAKE_BUILD_TYPE=Release .. && make -j