diff --git a/.travis.yml b/.travis.yml
index faa18e3a..9c5b85da 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,15 +15,15 @@ addons:
 
 cache:
   directories:
-    - $HOME/boost_1_65_1/boost
-    - $HOME/boost_1_65_1/stage/64/lib
+    - $HOME/boost_1_67_0/boost
+    - $HOME/boost_1_67_0/stage/64/lib
   cargo: true
 
 install:
   - export CXX="g++-6" CC="gcc-6"
   # Build Boost.
   - wget https://raw.githubusercontent.com/WrinklyNinja/ci-scripts/1.5.0/install_boost.py
-  - python install_boost.py --directory ~ --boost-version 1.65.1 -a 64 -t gcc-6 filesystem locale system thread
+  - python install_boost.py --directory ~ --boost-version 1.67.0 -a 64 -t gcc-6 filesystem locale system thread
   # Install packages for generating documentation
   - pip install --user -r docs/requirements.txt
   # Add sphinx-build to PATH
@@ -39,7 +39,7 @@ before_script:
   - mkdir build
   - cd build
   # Link dynamically to the C++ standard library runtime.
-  - cmake .. -DBOOST_ROOT=~/boost_1_65_1 -DBOOST_LIBRARYDIR=~/boost_1_65_1/stage/64/lib
+  - cmake .. -DBOOST_ROOT=~/boost_1_67_0 -DBOOST_LIBRARYDIR=~/boost_1_67_0/stage/64/lib
 
 script:
   - make all
diff --git a/appveyor.yml b/appveyor.yml
index bd9f95d4..8f86221e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -33,9 +33,9 @@ before_build:
   - cd build
   - ps: |
       if ($env:PLATFORM -eq 'Win32') {
-        cmake .. -G "Visual Studio 14 2015" -DBOOST_ROOT="C:\Libraries\boost_1_63_0" -DBOOST_LIBRARYDIR="C:\Libraries\boost_1_63_0\lib32-msvc-14.0"
+        cmake .. -G "Visual Studio 14 2015" -DBOOST_ROOT="C:\Libraries\boost_1_67_0" -DBOOST_LIBRARYDIR="C:\Libraries\boost_1_67_0\lib32-msvc-14.0"
       } else {
-        cmake .. -G "Visual Studio 14 2015 Win64" -DBOOST_ROOT="C:\Libraries\boost_1_63_0" -DBOOST_LIBRARYDIR="C:\Libraries\boost_1_63_0\lib64-msvc-14.0"
+        cmake .. -G "Visual Studio 14 2015 Win64" -DBOOST_ROOT="C:\Libraries\boost_1_67_0" -DBOOST_LIBRARYDIR="C:\Libraries\boost_1_67_0\lib64-msvc-14.0"
       }
 
 build: