diff --git a/.travis.yml b/.travis.yml
index 671b33a8..c050c653 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,6 +33,18 @@ jobs:
       install: sudo docker exec sharp bash -c "npm install --unsafe-perm"
       script: sudo docker exec sharp bash -c "npm test"
 
+    - name: "Linux x64 (CentOS 7, glibc 2.17) - Node.js 15"
+      os: linux
+      dist: bionic
+      language: shell
+      before_install:
+        - sudo chown 0.0 ${PWD}
+        - sudo docker run -dit --name sharp --env CI --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp centos:7
+        - sudo docker exec sharp bash -c "curl -sL https://rpm.nodesource.com/setup_15.x | bash -"
+        - sudo docker exec sharp yum install -y gcc-c++ make git nodejs
+      install: sudo docker exec sharp bash -c "npm install --unsafe-perm"
+      script: sudo docker exec sharp bash -c "npm test"
+
     - name: "Linux x64 (Alpine 3.9, musl 1.1.20) - Node.js 10"
       os: linux
       dist: bionic
@@ -63,6 +75,17 @@ jobs:
       install: sudo docker exec sharp sh -c "npm install --unsafe-perm"
       script: sudo docker exec sharp sh -c "npm test"
 
+    - name: "Linux x64 (Alpine 3.11, musl 1.1.20) - Node.js 15"
+      os: linux
+      dist: bionic
+      language: shell
+      before_install:
+        - sudo chown 0.0 ${PWD}
+        - sudo docker run -dit --name sharp --env CI --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp node:15.0-alpine
+        - sudo docker exec sharp apk add build-base git python2 --update-cache
+      install: sudo docker exec sharp sh -c "npm install --unsafe-perm"
+      script: sudo docker exec sharp sh -c "npm test"
+
     - name: "Linux ARM64v8 (Debian 11, glibc 2.29) - Node.js 10"
       arch: arm64
       os: linux
@@ -105,6 +128,21 @@ jobs:
       install: sudo docker exec sharp sh -c "npm install --unsafe-perm"
       script: sudo docker exec sharp sh -c "npm test"
 
+    - name: "Linux ARM64v8 (Debian 11, glibc 2.29) - Node.js 15"
+      arch: arm64
+      os: linux
+      dist: bionic
+      language: shell
+      before_install:
+        - sudo chown 0.0 ${PWD}
+        - sudo docker run -dit --name sharp --env CI --volume "${PWD}:/mnt/sharp" --workdir /mnt/sharp arm64v8/debian:bullseye
+        - sudo docker exec sharp sh -c "apt-get update && apt-get install -y build-essential git python2 curl"
+        - sudo docker exec sharp sh -c "curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -"
+        - sudo docker exec sharp sh -c "echo 'deb https://deb.nodesource.com/node_15.x sid main' >/etc/apt/sources.list.d/nodesource.list"
+        - sudo docker exec sharp sh -c "apt-get update && apt-get install -y nodejs"
+      install: sudo docker exec sharp sh -c "npm install --unsafe-perm"
+      script: sudo docker exec sharp sh -c "npm test"
+
     - name: "macOS (10.13) - Node.js 10"
       os: osx
       osx_image: xcode10.1
@@ -125,6 +163,13 @@ jobs:
       node_js: "14"
       before_install: unset prebuild_upload
 
+    - name: "macOS (10.13) - Node.js 15"
+      os: osx
+      osx_image: xcode10.1
+      language: node_js
+      node_js: "15"
+      before_install: unset prebuild_upload
+
     - name: "Unit test coverage report"
       os: linux
       dist: bionic
diff --git a/appveyor.yml b/appveyor.yml
index 8fedf0d3..267c3478 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-os: Visual Studio 2017
+os: Visual Studio 2019
 version: "{build}"
 build: off
 environment:
@@ -19,6 +19,12 @@ environment:
   - nodejs_version: "14"
     platform: x64
     prebuild_upload: ""
+  - nodejs_version: "15"
+    platform: x86
+    prebuild_upload: ""
+  - nodejs_version: "15"
+    platform: x64
+    prebuild_upload: ""
 install:
   - ps: Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version) $env:platform
   - npm install