diff --git a/ci/azure/linux_script b/ci/azure/linux_script
index 99647ee063..a5571ee76b 100755
--- a/ci/azure/linux_script
+++ b/ci/azure/linux_script
@@ -5,14 +5,14 @@ set -e
 
 BUILDDIR="$(pwd)"
 
-sudo sh -c 'echo "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-10 main" >> /etc/apt/sources.list'
+sudo sh -c 'echo "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-11 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
 
 sudo apt-get remove -y llvm-*
 sudo rm -rf /usr/local/*
-sudo apt-get install -y libxml2-dev libclang-10-dev llvm-10 llvm-10-dev liblld-10-dev cmake s3cmd gcc-7 g++-7 ninja-build tidy
+sudo apt-get install -y libxml2-dev libclang-11-dev llvm-11 llvm-11-dev liblld-11-dev cmake s3cmd gcc-7 g++-7 ninja-build tidy
 
 QEMUBASE="qemu-linux-x86_64-5.1.0"
 wget https://ziglang.org/deps/$QEMUBASE.tar.xz
@@ -44,7 +44,7 @@ VERSION="$(./zig version)"
 if [ "${BUILD_REASON}" != "PullRequest" ]; then
   ARTIFACTSDIR="$BUILDDIR/artifacts"
   mkdir "$ARTIFACTSDIR"
-  docker run -i --mount type=bind,source="$ARTIFACTSDIR",target=/z ziglang/static-base:llvm10-x86_64-1 -j2 $BUILD_SOURCEVERSION
+  docker run -i --mount type=bind,source="$ARTIFACTSDIR",target=/z ziglang/static-base:llvm11-x86_64-1 -j2 $BUILD_SOURCEVERSION
   TARBALL="$(ls $ARTIFACTSDIR)"
   mv "$DOWNLOADSECUREFILE_SECUREFILEPATH" "$HOME/.s3cfg"
   s3cmd put -P --add-header="cache-control: public, max-age=31536000, immutable" "$ARTIFACTSDIR/$TARBALL" s3://ziglang.org/builds/
diff --git a/ci/azure/macos_script b/ci/azure/macos_script
index e0de46d1c0..9288957593 100755
--- a/ci/azure/macos_script
+++ b/ci/azure/macos_script
@@ -5,24 +5,24 @@ set -e
 
 system_profiler SPHardwareDataType
 
-brew install s3cmd gcc@9
+brew install s3cmd gcc@10
 
 ZIGDIR="$(pwd)"
-LLVMVER="10.0.1"
+LLVMVER="11.0.0"
 ARCH="x86_64"
-CACHE_BASENAME="llvm+clang+lld-$LLVMVER-$ARCH-macosx-gcc9-release"
+CACHE_BASENAME="llvm+clang+lld-$LLVMVER-$ARCH-macosx-gcc10-release"
 PREFIX="$HOME/$CACHE_BASENAME"
 JOBS="-j2"
 
 # I tried using the system default compiler (clang), but it couldn't statically link libc++.
-# So we use gcc-9 from homebrew.
-export CC=gcc-9
-export CXX=g++-9
+# So we use gcc-10 from homebrew.
+export CC=gcc-10
+export CXX=g++-10
 
 rm -rf $PREFIX
 
 cd $HOME
-wget -nv "https://ziglang.org/builds/$CACHE_BASENAME.tar.xz"
+wget -nv "https://ziglang.org/deps/$CACHE_BASENAME.tar.xz"
 tar xf "$CACHE_BASENAME.tar.xz"
 
 cd $ZIGDIR
diff --git a/ci/azure/windows_msvc_install b/ci/azure/windows_msvc_install
index f2f3dcdfa5..b9775a716e 100644
--- a/ci/azure/windows_msvc_install
+++ b/ci/azure/windows_msvc_install
@@ -7,5 +7,5 @@ pacman -Su --needed --noconfirm
 pacman -S --needed --noconfirm wget p7zip python3-pip tar xz
 
 pip install s3cmd
-wget -nv "https://ziglang.org/deps/llvm%2bclang%2blld-10.0.0-x86_64-windows-msvc-release-mt.tar.xz"
-tar xf llvm+clang+lld-10.0.0-x86_64-windows-msvc-release-mt.tar.xz
+wget -nv "https://ziglang.org/deps/llvm%2bclang%2blld-11.0.0-x86_64-windows-msvc-release-mt.tar.xz"
+tar xf llvm+clang+lld-11.0.0-x86_64-windows-msvc-release-mt.tar.xz
diff --git a/ci/azure/windows_msvc_script.bat b/ci/azure/windows_msvc_script.bat
index 1568b1b153..4e606d6cbd 100644
--- a/ci/azure/windows_msvc_script.bat
+++ b/ci/azure/windows_msvc_script.bat
@@ -11,7 +11,7 @@ SET "MSYSTEM=%PREVMSYSTEM%"
 
 SET "ZIGBUILDDIR=%SRCROOT%\build"
 SET "ZIGINSTALLDIR=%ZIGBUILDDIR%\dist"
-SET "ZIGPREFIXPATH=%SRCROOT%\llvm+clang+lld-10.0.0-x86_64-windows-msvc-release-mt"
+SET "ZIGPREFIXPATH=%SRCROOT%\llvm+clang+lld-11.0.0-x86_64-windows-msvc-release-mt"
 
 call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvarsall.bat" x64
 
diff --git a/ci/drone/drone.yml b/ci/drone/drone.yml
index b7bc300f4f..02df735b6b 100644
--- a/ci/drone/drone.yml
+++ b/ci/drone/drone.yml
@@ -7,7 +7,7 @@ platform:
 
 steps:
 - name: build-and-test
-  image: ziglang/static-base:llvm10-aarch64-1
+  image: ziglang/static-base:llvm11-aarch64-1
   environment:
     SRHT_OAUTH_TOKEN:
       from_secret: SRHT_OAUTH_TOKEN
diff --git a/ci/srht/freebsd_script b/ci/srht/freebsd_script
index 3d9eb73735..84073a02e5 100755
--- a/ci/srht/freebsd_script
+++ b/ci/srht/freebsd_script
@@ -7,7 +7,7 @@ sudo pkg update -fq
 sudo pkg install -y cmake py27-s3cmd wget curl jq
 
 ZIGDIR="$(pwd)"
-CACHE_BASENAME="llvm+clang+lld-10.0.0-x86_64-freebsd-release"
+CACHE_BASENAME="llvm+clang+lld-11.0.0-x86_64-freebsd-release"
 PREFIX="$HOME/$CACHE_BASENAME"
 JOBS="-j$(sysctl -n hw.ncpu)"