diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a3d88f3..53abe97 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,7 +6,7 @@ bionic-cpp-build:
   #   - apt update && apt -y install libasio-dev
   script:
     - mkdir build && cd build
-    - cmake ..
+    - cmake -DCMAKE_BUILD_TYPE=Release ..
     - cmake --build . && cpack
   # artifacts:
   #   paths:
@@ -36,7 +36,7 @@ focal-cpp-build:
   #   - apt update && apt -y install libasio-dev
   script:
     - mkdir build && cd build
-    - cmake ..
+    - cmake -DCMAKE_BUILD_TYPE=Release ..
     - cmake --build . && cpack
 
 focal-cpp-test: