diff --git a/PLATFORMS.md b/PLATFORMS.md
index e2220229a..d33efa272 100644
--- a/PLATFORMS.md
+++ b/PLATFORMS.md
@@ -44,9 +44,9 @@ In this policy, the words "must" and "must not" specify absolute requirements th
 
 ### Tier 1
 
-- x86_64/amd64/x64 for Ubuntu Linux (Focal)†
+- x86_64/amd64/x64 for Ubuntu Linux (Noble)†
 - x86_64/amd64/x64 for MacOS (XCode 14 and 15)
-- aarch64 for Ubuntu (Focal)
+- aarch64 for Ubuntu (Noble)
 - aarch64 for MacOS (XCode 15)
 - armhf/ARM7 and aarch64 emulation on Ubuntu
 
@@ -60,5 +60,3 @@ In this policy, the words "must" and "must not" specify absolute requirements th
 ### Tier 3
 
 - x86 for Windows (Visual Studio Toolchain)
-- ppc64le for Ubuntu (Focal)
-- s390x for Ubuntu (Focal)