diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 928cdc8..bb3a971 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -11,7 +11,10 @@ on:
 jobs:
   test:
     name: test
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        cxx: [g++-14]
+    runs-on: ubuntu-24.04
 
     steps:
     - uses: actions/checkout@v4
diff --git a/src/_vroom.cpp b/src/_vroom.cpp
index 1988d6a..553dfcd 100644
--- a/src/_vroom.cpp
+++ b/src/_vroom.cpp
@@ -42,7 +42,7 @@
 #include "structures/typedefs.h"
 
 #include "structures/generic/edge.cpp"
-#include "structures/generic/matrix.cpp"
+#include "structures/generic/matrix.h"
 #include "structures/generic/undirected_graph.cpp"
 
 #include "structures/vroom/cost_wrapper.cpp"
diff --git a/vroom b/vroom
index 1fd711b..bc29414 160000
--- a/vroom
+++ b/vroom
@@ -1 +1 @@
-Subproject commit 1fd711bc8c20326dd8e9538e2c7e4cb1ebd67bdb
+Subproject commit bc294146ea168d1b7ff3263c34a217c99072ea9d