diff --git a/README.md b/README.md
index 210849d1..b875f717 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ The Dockerfiles in this repository are used for building the .NET Core product.
 
 The images produced from the Dockerfiles are published to the mcr.microsoft.com/dotnet-buildtools/prereqs Docker repository.
 
-  - [Latest tags](https://github.com/dotnet/versions/blob/master/build-info/docker/image-info.dotnet-dotnet-buildtools-prereqs-docker-main.json)
+  - [Latest tags](https://github.com/dotnet/versions/blob/main/build-info/docker/image-info.dotnet-dotnet-buildtools-prereqs-docker-main.json)
   - [Full list of tags](https://mcr.microsoft.com/v2/dotnet-buildtools/prereqs/tags/list)
 
 ## How to identify an image
diff --git a/src/ubuntu/16.04/cross/arm64-alpine/hooks/pre-build b/src/ubuntu/16.04/cross/arm64-alpine/hooks/pre-build
index 26f5cd77..df499bf6 100755
--- a/src/ubuntu/16.04/cross/arm64-alpine/hooks/pre-build
+++ b/src/ubuntu/16.04/cross/arm64-alpine/hooks/pre-build
@@ -2,4 +2,4 @@
 
 SCRIPT=$(readlink -f "$0")
 SCRIPTPATH=$(dirname "$SCRIPT")
-$SCRIPTPATH/../../../../build-scripts/build-rootfs.sh ubuntu-16.04 alpine3.13 arm64 lldb3.9
+$SCRIPTPATH/../../../../build-scripts/build-rootfs.sh ubuntu-16.04 alpine arm64 lldb3.9
diff --git a/src/ubuntu/18.04/cross/arm64-alpine/hooks/pre-build b/src/ubuntu/18.04/cross/arm64-alpine/hooks/pre-build
index 0c2cfc63..ef604622 100755
--- a/src/ubuntu/18.04/cross/arm64-alpine/hooks/pre-build
+++ b/src/ubuntu/18.04/cross/arm64-alpine/hooks/pre-build
@@ -2,4 +2,4 @@
 
 SCRIPT=$(readlink -f "$0")
 SCRIPTPATH=$(dirname "$SCRIPT")
-$SCRIPTPATH/../../../../build-scripts/build-rootfs.sh ubuntu-18.04 alpine3.13 arm64 lldb3.9
+$SCRIPTPATH/../../../../build-scripts/build-rootfs.sh ubuntu-18.04 alpine arm64 lldb3.9