diff --git a/.appveyor.yml b/.appveyor.yml
index 62edb10..27089cb 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -3,6 +3,7 @@ shallow_clone: true
 image:
   - Visual Studio 2015
   - Visual Studio 2017
+  - Visual Studio 2019 Preview
 platform:
   - Win32
   - x64
diff --git a/.travis.yml b/.travis.yml
index 5ea4d0f..6a22839 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,18 +1,6 @@
 language: cpp
 matrix:
   include:
-    - os: linux
-      dist: trusty
-      addons: { apt: { sources: ubuntu-toolchain-r-test, packages: ["xorg-dev", "g++-4.9"] } }
-      env: MATRIX_EVAL="CC=gcc-4.9 && CXX=g++-4.9"
-    - os: linux
-      dist: trusty
-      addons: { apt: { sources: ubuntu-toolchain-r-test, packages: ["xorg-dev", "g++-5"] } }
-      env: MATRIX_EVAL="CC=gcc-5 && CXX=g++-5"
-    - os: linux
-      dist: trusty
-      addons: { apt: { sources: ubuntu-toolchain-r-test, packages: ["xorg-dev", "g++-6"] } }
-      env: MATRIX_EVAL="CC=gcc-6 && CXX=g++-6"
     - os: linux
       dist: trusty
       addons: { apt: { sources: ubuntu-toolchain-r-test, packages: ["xorg-dev", "g++-7"] } }
@@ -21,18 +9,6 @@ matrix:
       dist: trusty
       addons: { apt: { sources: ubuntu-toolchain-r-test, packages: ["xorg-dev", "g++-8"] } }
       env: MATRIX_EVAL="CC=gcc-8 && CXX=g++-8"
-    - os: linux
-      dist: trusty
-      addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-precise-3.8"], packages: ["xorg-dev", "clang-3.8", "g++-5"] } }
-      env: MATRIX_EVAL="CC=clang-3.8 && CXX=clang++-3.8"
-    - os: linux
-      dist: trusty
-      addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-precise-3.9"], packages: ["xorg-dev", "clang-3.9", "g++-5"] } }
-      env: MATRIX_EVAL="CC=clang-3.9 && CXX=clang++-3.9"
-    - os: linux
-      dist: trusty
-      addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-trusty-4.0"], packages: ["xorg-dev", "clang-4.0", "g++-5"] } }
-      env: MATRIX_EVAL="CC=clang-4.0 && CXX=clang++-4.0"
     - os: linux
       dist: trusty
       addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-trusty-5.0"], packages: ["xorg-dev", "clang-5.0", "g++-7"] } }
@@ -41,9 +17,14 @@ matrix:
       dist: trusty
       addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-trusty-6.0"], packages: ["xorg-dev", "clang-6.0", "g++-7"] } }
       env: MATRIX_EVAL="CC=clang-6.0 && CXX=clang++-6.0"
-    - os: osx
-      osx_image: xcode8.3
-      compiler: clang
+    - os: linux
+      dist: trusty
+      addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-trusty-7"], packages: ["xorg-dev", "clang-7", "g++-7"] } }
+      env: MATRIX_EVAL="CC=clang-7 && CXX=clang++-7"
+    - os: linux
+      dist: trusty
+      addons: { apt: { sources: ["ubuntu-toolchain-r-test", "llvm-toolchain-trusty-8"], packages: ["xorg-dev", "clang-8", "g++-7"] } }
+      env: MATRIX_EVAL="CC=clang-8 && CXX=clang++-8"
     - os: osx
       osx_image: xcode9
       compiler: clang
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c62b32d..01df7af 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-# 3.8 version is required for `cxx_std_14`
+# 3.8 version is required for `cxx_std_17`
 cmake_minimum_required(VERSION 3.8 FATAL_ERROR)
 
 if(NOT DEFINED PROJECT_NAME)
@@ -9,7 +9,7 @@ project(flat.hpp)
 
 add_library(${PROJECT_NAME} INTERFACE)
 target_include_directories(${PROJECT_NAME} INTERFACE headers)
-target_compile_features(${PROJECT_NAME} INTERFACE cxx_std_14)
+target_compile_features(${PROJECT_NAME} INTERFACE cxx_std_17)
 
 if(BUILD_AS_STANDALONE)
     option(BUILD_WITH_UNBENCH "Build with benchmarks" OFF)
diff --git a/README.md b/README.md
index 52e75b5..e815979 100644
--- a/README.md
+++ b/README.md
@@ -10,14 +10,14 @@
 [badge.travis]: https://img.shields.io/travis/BlackMATov/flat.hpp/master.svg?logo=travis
 [badge.appveyor]: https://img.shields.io/appveyor/ci/BlackMATov/flat-hpp/master.svg?logo=appveyor
 [badge.codecov]: https://img.shields.io/codecov/c/github/BlackMATov/flat.hpp/master.svg?logo=codecov
-[badge.language]: https://img.shields.io/badge/language-C%2B%2B14-red.svg
+[badge.language]: https://img.shields.io/badge/language-C%2B%2B17-yellow.svg
 [badge.license]: https://img.shields.io/badge/license-MIT-blue.svg
 [badge.paypal]: https://img.shields.io/badge/donate-PayPal-orange.svg?logo=paypal&colorA=00457C
 
 [travis]: https://travis-ci.org/BlackMATov/flat.hpp
 [appveyor]: https://ci.appveyor.com/project/BlackMATov/flat-hpp
 [codecov]: https://codecov.io/gh/BlackMATov/flat.hpp
-[language]: https://en.wikipedia.org/wiki/C%2B%2B14
+[language]: https://en.wikipedia.org/wiki/C%2B%2B17
 [license]: https://en.wikipedia.org/wiki/MIT_License
 [paypal]: https://www.paypal.me/matov