diff --git a/.travis.yml b/.travis.yml
index 37e78e50..fab21c73 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,6 +25,27 @@ matrix:
     - os: linux
       env: TOOLSET=gcc CXXSTD=03,11,1y
 
+    - os: linux
+      env: TOOLSET=gcc-4.4 CXXSTD=03,0x
+      addons:
+        apt:
+          packages:
+            - g++-4.4
+
+    - os: linux
+      env: TOOLSET=gcc-4.5 CXXSTD=03,0x
+      addons:
+        apt:
+          packages:
+            - g++-4.5
+
+    - os: linux
+      env: TOOLSET=gcc-4.6 CXXSTD=03,0x
+      addons:
+        apt:
+          packages:
+            - g++-4.6
+
     - os: linux
       env: TOOLSET=gcc-4.7 CXXSTD=03,11
       addons:
@@ -148,6 +169,17 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-trusty-4.0
 
+    - os: linux
+      env: TOOLSET=clang-5.0 CXXSTD=03,11,14,1z,2a
+      addons:
+        apt:
+          packages:
+            - clang-5.0
+            - libstdc++-4.9-dev
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-trusty-5.0
+
     - os: osx
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
 
diff --git a/appveyor.yml b/appveyor.yml
index fb161009..4613ff61 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -11,16 +11,31 @@ environment:
   matrix:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
       TOOLSET: msvc-9.0
+      CXXSTD: latest # fake
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
       TOOLSET: msvc-10.0
+      CXXSTD: latest # fake
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
       TOOLSET: msvc-11.0
+      CXXSTD: latest # fake
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
       TOOLSET: msvc-12.0
+      CXXSTD: latest # fake
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       TOOLSET: msvc-14.0
+      CXXSTD: 14
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      TOOLSET: msvc-14.0
+      CXXSTD: latest
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       TOOLSET: msvc-14.1
+      CXXSTD: 14
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      TOOLSET: msvc-14.1
+      CXXSTD: 17
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      TOOLSET: msvc-14.1
+      CXXSTD: latest
 
 install:
   - set BOOST_BRANCH=develop
@@ -67,4 +82,4 @@ install:
 build: off
 
 test_script:
-  - b2 -j%NUMBER_OF_PROCESSORS% --hash libs/fusion/test toolset=%TOOLSET%
+  - b2 -j%NUMBER_OF_PROCESSORS% --hash libs/fusion/test toolset=%TOOLSET% cxxstd=%CXXSTD%