diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c791682..ff41cbb 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,7 @@
 default:
-  image: docker:20.10.16
+  image: docker:27-cli
   services:
-    - docker:20.10.16-dind
+    - docker:27-dind
   before_script:
     - echo "$CI_REGISTRY_PASSWORD" | docker login $CI_REGISTRY -u $CI_REGISTRY_USER --password-stdin
 
diff --git a/client/Dockerfile b/client/Dockerfile
index cd89bfb..0826ba4 100644
--- a/client/Dockerfile
+++ b/client/Dockerfile
@@ -57,22 +57,22 @@ RUN apk add --no-cache sqlite-libs curl gmp libstdc++ libgcc luajit irrlicht x11
 
 WORKDIR /var/lib/minetest
 
-COPY <<'EOF' /var/lib/minetest/.minetest/minetest.conf
-  enable_fog = false
-  leaves_style = opaque
-  smooth_lighting = false
-  enable_clouds = false
-  enable_sound = false
-  enable_particles = false
-  undersampling = 8
-  enable_shaders = false
-  fps_max = 10
-  viewing_range = 20
-  screen_w = 640
-  screen_h = 480
-  fullscreen_bpp = 8
-  fov = 45
-  video_driver = opengl
+COPY <<-EOF /var/lib/minetest/.minetest/minetest.conf
+	enable_fog = false
+	leaves_style = opaque
+	smooth_lighting = false
+	enable_clouds = false
+	enable_sound = false
+	enable_particles = false
+	undersampling = 8
+	enable_shaders = false
+	fps_max = 10
+	viewing_range = 20
+	screen_w = 640
+	screen_h = 480
+	fullscreen_bpp = 8
+	fov = 45
+	video_driver = opengl
 EOF
 
 RUN chown minetest:minetest /var/lib/minetest/.minetest/minetest.conf