diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index f7b24e8..33f7885 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -14,7 +14,7 @@ jobs:
         run: |
           sudo apt-get update -y
           sudo apt-get install -y \
-            cmake doxygen gcc gcovr pkg-config \
+            cmake doxygen gcc gcovr graphviz pkg-config \
             libasound2-dev libfreetype-dev libharfbuzz-dev \
             libpng-dev libtiff-dev libwebp-dev \
             libudev-dev libx11-dev libxcursor-dev libxext-dev \