diff --git a/.github/workflows/CICD.yml b/.github/workflows/CICD.yml
index 5ff77927..19d4e927 100644
--- a/.github/workflows/CICD.yml
+++ b/.github/workflows/CICD.yml
@@ -58,6 +58,11 @@ jobs:
       with:
         command: test
         args: --release
+    - name: Run ignored-by-default unit tests with new syntaxes and themes
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: --release -- --ignored
     - name: Syntax highlighting regression test
       run: tests/syntax-tests/regression_test.sh
     - name: List of languages
diff --git a/tests/assets.rs b/tests/assets.rs
index ff61850b..55b5399e 100644
--- a/tests/assets.rs
+++ b/tests/assets.rs
@@ -1,7 +1,9 @@
 use bat::assets::HighlightingAssets;
 
 /// This test ensures that we are not accidentally removing themes due to submodule updates.
+/// It is 'ignore'd by default because it requires themes.bin to be up-to-date.
 #[test]
+#[ignore]
 fn all_themes_are_present() {
     let assets = HighlightingAssets::from_binary();