diff --git a/ci/azure-test-nightly.yml b/ci/azure-test-nightly.yml
index dc6bc60..4a6d011 100644
--- a/ci/azure-test-nightly.yml
+++ b/ci/azure-test-nightly.yml
@@ -3,16 +3,10 @@ jobs:
   displayName: Test Nightly
   strategy:
     matrix:
-      "(Ubuntu 16.04)":
-        vmImage: ubuntu-16.04
       "(Ubuntu 18.04)":
         vmImage: ubuntu-18.04
-      "(macOS X Mojave)":
-        vmImage: macOS-10.14
       "(macOS X Catalina)":
         vmImage: macOS-10.15
-      "(Windows Server 2016)":
-        vmImage: vs2017-win2016
       "(Windows Server 2019)":
         vmImage: windows-2019
   pool:
diff --git a/ci/azure-test-stable.yml b/ci/azure-test-stable.yml
index ca5e760..c3c8306 100644
--- a/ci/azure-test-stable.yml
+++ b/ci/azure-test-stable.yml
@@ -3,16 +3,10 @@ jobs:
   displayName: Test Stable
   strategy:
     matrix:
-      "(Ubuntu 16.04)":
-        vmImage: ubuntu-16.04
       "(Ubuntu 18.04)":
         vmImage: ubuntu-18.04
-      "(macOS X Mojave)":
-        vmImage: macOS-10.14
       "(macOS X Catalina)":
         vmImage: macOS-10.15
-      "(Windows Server 2016)":
-        vmImage: vs2017-win2016
       "(Windows Server 2019)":
         vmImage: windows-2019
   pool: