diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 75af05f..37b57f0 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -2,9 +2,9 @@ name: C/C++ CI
 
 on:
   push:
-    branches: [ master, add-* ]
+    branches: [ cpp14, add-* ]
   pull_request:
-    branches: [ master ]
+    branches: [ cpp14 ]
 
 jobs:
   build:
@@ -13,6 +13,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+     # install dependencies
+    - name: boost
+      run: sudo apt-get update && sudo apt-get install -yq libboost1.65-dev
     - name: git_actions
       run: git submodule update --init --recursive
     - name: cmake
diff --git a/include/just_gtfs/just_gtfs.h b/include/just_gtfs/just_gtfs.h
index 262d728..40586bc 100644
--- a/include/just_gtfs/just_gtfs.h
+++ b/include/just_gtfs/just_gtfs.h
@@ -21,6 +21,7 @@
 #include <utility>
 #include <vector>
 #include <boost/optional.hpp>
+#include <boost/optional/optional_io.hpp>
 
 namespace gtfs
 {