diff --git a/.azure/pipelines/ci.yml b/.azure/pipelines/ci.yml
index ce1230dc698eca79425596634b24cc7b6a84159c..ea14e93a1590e5ff6a8a6e2a70cf22132cb0cd10 100644
--- a/.azure/pipelines/ci.yml
+++ b/.azure/pipelines/ci.yml
@@ -7,9 +7,9 @@ trigger:
   batch: true
   branches:
     include:
-    - master
+    - main
     - release/*
-    - internal/release/3.*
+    - internal/release/*
 
 # Run PR validation on all branches
 pr:
diff --git a/eng/docker/rhel.Dockerfile b/eng/docker/rhel.Dockerfile
index d42ab7b389936e28e09ef7e4aa341ecab2e4c62c..3305ca5d2fe3bd320203671e297cef7c3f9c48ad 100644
--- a/eng/docker/rhel.Dockerfile
+++ b/eng/docker/rhel.Dockerfile
@@ -1,5 +1,5 @@
 # Dockerfile that creates a container suitable to build dotnet-cli
-FROM mcr.microsoft.com/dotnet-buildtools/prereqs:rhel-7-rpmpkg-e1b4a89-20175311035359
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:centos-7-rpmpkg
 
 # Setup User to match Host User, and give superuser permissions
 ARG USER
diff --git a/eng/docker/ubuntu-alpine37.Dockerfile b/eng/docker/ubuntu-alpine37.Dockerfile
index 7cc731257db5281b954e3cf6aca607cc8a22ef70..1e0bb236046a3049e9d50b05afbc923c89e97d42 100644
--- a/eng/docker/ubuntu-alpine37.Dockerfile
+++ b/eng/docker/ubuntu-alpine37.Dockerfile
@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-18.04-cross-arm64-alpine-85814b7-20200327151156
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-18.04-cross-arm64-alpine
 ARG USER
 ARG USER_ID
 ARG GROUP_ID