diff --git a/README.md b/README.md
index d3a64abba3..71e77d6c40 100644
--- a/README.md
+++ b/README.md
@@ -87,14 +87,14 @@ that counts as "freestanding" for the purposes of this table.
 
  * cmake >= 2.8.5
  * gcc >= 5.0.0 or clang >= 3.6.0
- * LLVM, Clang, LLD development libraries == 7.x, compiled with the same gcc or clang version above
+ * LLVM, Clang, LLD development libraries == 8.x, compiled with the same gcc or clang version above
    - These depend on zlib and libxml2.
 
 ##### Windows
 
  * cmake >= 2.8.5
- * Microsoft Visual Studio 2015
- * LLVM, Clang, LLD development libraries == 7.x, compiled with the same MSVC version above
+ * Microsoft Visual Studio 2017 (version 15.8)
+ * LLVM, Clang, LLD development libraries == 8.x, compiled with the same MSVC version above
 
 #### Instructions
 
@@ -112,11 +112,11 @@ bin/zig build --build-file ../build.zig test
 ##### MacOS
 
 ```
-brew install cmake llvm@7
-brew outdated llvm@7 || brew upgrade llvm@7
+brew install cmake llvm@8
+brew outdated llvm@8 || brew upgrade llvm@8
 mkdir build
 cd build
-cmake .. -DCMAKE_PREFIX_PATH=/usr/local/opt/llvm@7/
+cmake .. -DCMAKE_PREFIX_PATH=/usr/local/opt/llvm@8/
 make install
 bin/zig build --build-file ../build.zig test
 ```
diff --git a/ci/appveyor/appveyor.yml b/ci/appveyor/appveyor.yml
index 8358fa52d3..1401861deb 100644
--- a/ci/appveyor/appveyor.yml
+++ b/ci/appveyor/appveyor.yml
@@ -7,3 +7,4 @@ after_build:
   - '%APPVEYOR_BUILD_FOLDER%\ci\appveyor\after_build.bat'
 cache:
   - 'llvm+clang-7.0.0-win64-msvc-release.tar.xz'
+  - 'llvm+clang-8.0.0-win64-msvc-release.tar.xz'
diff --git a/ci/appveyor/build_script.bat b/ci/appveyor/build_script.bat
index 0a2745365d..8012ec8738 100644
--- a/ci/appveyor/build_script.bat
+++ b/ci/appveyor/build_script.bat
@@ -7,13 +7,13 @@ SET "PATH=C:\msys64\mingw64\bin;C:\msys64\usr\bin;%PATH%"
 SET "MSYSTEM=MINGW64"
 SET "APPVEYOR_CACHE_ENTRY_ZIP_ARGS=-m0=Copy"
 
-bash -lc "cd ${APPVEYOR_BUILD_FOLDER} && if [ -s ""llvm+clang-7.0.0-win64-msvc-release.tar.xz"" ]; then echo 'skipping LLVM download'; else wget 'https://s3.amazonaws.com/ziglang.org/deps/llvm%%2bclang-7.0.0-win64-msvc-release.tar.xz'; fi && tar xf llvm+clang-7.0.0-win64-msvc-release.tar.xz" || exit /b
+bash -lc "cd ${APPVEYOR_BUILD_FOLDER} && if [ -s ""llvm+clang-8.0.0-win64-msvc-release.tar.xz"" ]; then echo 'skipping LLVM download'; else wget 'https://s3.amazonaws.com/ziglang.org/deps/llvm%%2bclang-8.0.0-win64-msvc-release.tar.xz'; fi && tar xf llvm+clang-8.0.0-win64-msvc-release.tar.xz" || exit /b
 
 
 SET "PATH=%PREVPATH%"
 SET "MSYSTEM=%PREVMSYSTEM%"
 SET "ZIGBUILDDIR=%APPVEYOR_BUILD_FOLDER%\build-msvc-release"
-SET "ZIGPREFIXPATH=%APPVEYOR_BUILD_FOLDER%\llvm+clang-7.0.0-win64-msvc-release"
+SET "ZIGPREFIXPATH=%APPVEYOR_BUILD_FOLDER%\llvm+clang-8.0.0-win64-msvc-release"
 
 call "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64
 call "C:\Program Files (x86)\Microsoft Visual Studio 15.0\VC\vcvarsall.bat" x86_amd64
diff --git a/ci/travis_linux_before_install b/ci/travis_linux_before_install
index 7a3043be3a..bd160d7a07 100755
--- a/ci/travis_linux_before_install
+++ b/ci/travis_linux_before_install
@@ -2,7 +2,7 @@
 
 set -x
 
-sudo sh -c 'echo "deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-7 main" >> /etc/apt/sources.list'
+sudo sh -c 'echo "deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-8 main" >> /etc/apt/sources.list'
 wget -O - http://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
 sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
 sudo apt-get update -q
diff --git a/ci/travis_linux_install b/ci/travis_linux_install
index ea2e931e6f..8f1e3ef49d 100755
--- a/ci/travis_linux_install
+++ b/ci/travis_linux_install
@@ -4,4 +4,4 @@ set -x
 
 sudo apt-get remove -y llvm-*
 sudo rm -rf /usr/local/*
-sudo apt-get install -y libxml2-dev libclang-7-dev llvm-7 llvm-7-dev cmake s3cmd gcc-7 g++-7
+sudo apt-get install -y libxml2-dev libclang-8-dev llvm-8 llvm-8-dev cmake s3cmd gcc-7 g++-7
diff --git a/ci/travis_linux_script b/ci/travis_linux_script
index 54a3f0bb97..1bbab10684 100755
--- a/ci/travis_linux_script
+++ b/ci/travis_linux_script
@@ -14,7 +14,7 @@ make -j2 install
 
 if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then
   mkdir $TRAVIS_BUILD_DIR/artifacts
-  docker run -it --mount type=bind,source="$TRAVIS_BUILD_DIR/artifacts",target=/z ziglang/static-base:llvm7-1 -j2 $TRAVIS_COMMIT
+  docker run -it --mount type=bind,source="$TRAVIS_BUILD_DIR/artifacts",target=/z ziglang/static-base:llvm8-1 -j2 $TRAVIS_COMMIT
   echo "access_key = $AWS_ACCESS_KEY_ID" >> ~/.s3cfg
   echo "secret_key = $AWS_SECRET_ACCESS_KEY" >> ~/.s3cfg
   s3cmd put -P $TRAVIS_BUILD_DIR/artifacts/* s3://ziglang.org/builds/
diff --git a/ci/travis_osx_install b/ci/travis_osx_install
index 2ad5e485c3..6d70229527 100755
--- a/ci/travis_osx_install
+++ b/ci/travis_osx_install
@@ -2,6 +2,6 @@
 
 set -x
 
-brew install llvm@7
-brew outdated llvm@7 || brew upgrade llvm@7
+brew install llvm@8
+brew outdated llvm@8 || brew upgrade llvm@8
 
diff --git a/ci/travis_osx_script b/ci/travis_osx_script
index 69c026f3a2..fb4cd6bfb6 100755
--- a/ci/travis_osx_script
+++ b/ci/travis_osx_script
@@ -5,7 +5,7 @@ set -e
 
 mkdir build
 cd build
-cmake .. -DCMAKE_PREFIX_PATH=/usr/local/opt/llvm@7/ -DCMAKE_BUILD_TYPE=Release
+cmake .. -DCMAKE_PREFIX_PATH=/usr/local/opt/llvm@8/ -DCMAKE_BUILD_TYPE=Release
 make VERBOSE=1
 make install
 
diff --git a/cmake/Findclang.cmake b/cmake/Findclang.cmake
index ea1bc91d7b..886b7232a8 100644
--- a/cmake/Findclang.cmake
+++ b/cmake/Findclang.cmake
@@ -27,9 +27,9 @@ if(MSVC)
 else()
   find_path(CLANG_INCLUDE_DIRS NAMES clang/Frontend/ASTUnit.h
       PATHS
-          /usr/lib/llvm/7/include
-          /usr/lib/llvm-7/include
-          /usr/lib/llvm-7.0/include
+          /usr/lib/llvm/8/include
+          /usr/lib/llvm-8/include
+          /usr/lib/llvm-8.0/include
           /mingw64/include)
 
       macro(FIND_AND_ADD_CLANG_LIB _libname_)
@@ -37,9 +37,9 @@ else()
       find_library(CLANG_${_prettylibname_}_LIB NAMES ${_libname_}
           PATHS
               ${CLANG_LIBDIRS}
-              /usr/lib/llvm/7/lib
-              /usr/lib/llvm-7/lib
-              /usr/lib/llvm-7.0/lib
+              /usr/lib/llvm/8/lib
+              /usr/lib/llvm-8/lib
+              /usr/lib/llvm-8.0/lib
               /mingw64/lib
               /c/msys64/mingw64/lib
               c:\\msys64\\mingw64\\lib)
diff --git a/cmake/Findlld.cmake b/cmake/Findlld.cmake
index 1c4e9163a3..d9aa4487de 100644
--- a/cmake/Findlld.cmake
+++ b/cmake/Findlld.cmake
@@ -8,10 +8,10 @@
 
 find_path(LLD_INCLUDE_DIRS NAMES lld/Common/Driver.h
     PATHS
-        /usr/lib/llvm-6.0/include
+        /usr/lib/llvm-8.0/include
         /mingw64/include)
 
-find_library(LLD_LIBRARY NAMES lld-6.0 lld PATHS /usr/lib/llvm-6.0/lib)
+find_library(LLD_LIBRARY NAMES lld-8.0 lld PATHS /usr/lib/llvm-8.0/lib)
 if(EXISTS ${LLD_LIBRARY})
     set(LLD_LIBRARIES ${LLD_LIBRARY})
 else()
@@ -19,7 +19,7 @@ else()
         string(TOUPPER ${_libname_} _prettylibname_)
         find_library(LLD_${_prettylibname_}_LIB NAMES ${_libname_}
             PATHS
-                /usr/lib/llvm-6.0/lib
+                /usr/lib/llvm-8.0/lib
                 /mingw64/lib
                 /c/msys64/mingw64/lib
                 c:/msys64/mingw64/lib)
diff --git a/cmake/Findllvm.cmake b/cmake/Findllvm.cmake
index 9a4fa3f31c..4e22995c93 100644
--- a/cmake/Findllvm.cmake
+++ b/cmake/Findllvm.cmake
@@ -8,12 +8,12 @@
 # LLVM_LIBDIRS
 
 find_program(LLVM_CONFIG_EXE
-    NAMES llvm-config llvm-config-7 llvm-config-7.0
+    NAMES llvm-config llvm-config-8 llvm-config-8.0
     PATHS
         "/mingw64/bin"
         "/c/msys64/mingw64/bin"
         "c:/msys64/mingw64/bin"
-        "C:/Libraries/llvm-7.0.0/bin")
+        "C:/Libraries/llvm-8.0.0/bin")
 
 if(NOT(CMAKE_BUILD_TYPE STREQUAL "Debug") OR ZIG_STATIC)
   execute_process(
@@ -62,7 +62,7 @@ execute_process(
 set(LLVM_LIBRARIES ${LLVM_LIBRARIES} ${LLVM_SYSTEM_LIBS})
 
 if(NOT LLVM_LIBRARIES)
-  find_library(LLVM_LIBRARIES NAMES LLVM LLVM-7 LLVM-7.0)
+  find_library(LLVM_LIBRARIES NAMES LLVM LLVM-8 LLVM-8.0)
 endif()
 
 link_directories("${CMAKE_PREFIX_PATH}/lib")