diff --git a/.github/workflows/validation-linux.yml b/.github/workflows/validation-linux.yml
index 8fd5ac5caf..870299b4bd 100644
--- a/.github/workflows/validation-linux.yml
+++ b/.github/workflows/validation-linux.yml
@@ -4,6 +4,7 @@ on:
     paths:
     - 'tests/out/*.spvasm.snap'
     - 'tests/out/*.glsl.snap'
+    - 'tests/out/*.dot.snap'
 
 jobs:
   validate-linux:
@@ -12,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Install tools
-        run: sudo apt-get install spirv-tools glslang-tools
+        run: sudo apt-get install spirv-tools glslang-tools graphviz
       - run: make validate-spv
       - run: make validate-glsl
       - run: make validate-dot