diff --git a/.travis.yml b/.travis.yml
index d7e2f8e..85fa40e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -111,7 +111,6 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      dist: trusty
       compiler: g++-7
       env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=03,11,14,17
       addons:
@@ -122,7 +121,6 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      dist: trusty
       compiler: g++-7
       env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=03,11,14,17 CXXSTD_DIALECT=cxxstd-dialect=gnu
       addons:
@@ -133,7 +131,6 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      dist: trusty
       compiler: g++-8
       env: TOOLSET=gcc COMPILER=g++-8 CXXSTD=03,11,14,17
       addons:
@@ -144,7 +141,6 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      dist: trusty
       compiler: g++-8
       env: TOOLSET=gcc COMPILER=g++-8 CXXSTD=03,11,14,17 CXXSTD_DIALECT=cxxstd-dialect=gnu
       addons:
@@ -154,6 +150,28 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
 
+    - os: linux
+      dist: xenial
+      compiler: g++-9
+      env: TOOLSET=gcc COMPILER=g++-9 CXXSTD=03,11,14,17,2a
+      addons:
+        apt:
+          packages:
+            - g++-9
+          sources:
+            - ubuntu-toolchain-r-test
+
+    - os: linux
+      dist: xenial
+      compiler: g++-9
+      env: TOOLSET=gcc COMPILER=g++-9 CXXSTD=03,11,14,17,2a CXXSTD_DIALECT=cxxstd-dialect=gnu
+      addons:
+        apt:
+          packages:
+            - g++-9
+          sources:
+            - ubuntu-toolchain-r-test
+
     - os: linux
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11
 
@@ -256,6 +274,17 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-xenial-7
 
+    - os: linux
+      compiler: clang++-8
+      env: TOOLSET=clang COMPILER=clang++-8 CXXSTD=03,11,14,17,2a
+      addons:
+        apt:
+          packages:
+            - clang-8
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-xenial-8
+
     - os: osx
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
       osx_image: xcode10.1