diff --git a/blocked-edges/4.18.0-rc.0-MachineConfigServerCARotation.yaml b/blocked-edges/4.18.0-rc.0-MachineConfigServerCARotation.yaml
new file mode 100644
index 000000000..53842b5ac
--- /dev/null
+++ b/blocked-edges/4.18.0-rc.0-MachineConfigServerCARotation.yaml
@@ -0,0 +1,8 @@
+to: 4.18.0-rc.0
+from: 4[.]18[.]0-ec[.]4[+].*
+url: https://issues.redhat.com/browse/MCO-1481
+name: MachineConfigServerCARotation
+message: |-
+  4.18.0-ec.4 adjusted machine-config server CA management.  The change was reverted in 4.18.0-rc.0, but clusters running 4.18.0-ec.4 need manual steps to be able to scale new Machines. 
+matchingRules:
+- type: Always
diff --git a/blocked-edges/4.18.0-rc.1-MachineConfigServerCARotation.yaml b/blocked-edges/4.18.0-rc.1-MachineConfigServerCARotation.yaml
new file mode 100644
index 000000000..7ce9bae00
--- /dev/null
+++ b/blocked-edges/4.18.0-rc.1-MachineConfigServerCARotation.yaml
@@ -0,0 +1,8 @@
+to: 4.18.0-rc.1
+from: 4[.]18[.]0-ec[.]4[+].*
+url: https://issues.redhat.com/browse/MCO-1481
+name: MachineConfigServerCARotation
+message: |-
+  4.18.0-ec.4 adjusted machine-config server CA management.  The change was reverted in 4.18.0-rc.0, but clusters running 4.18.0-ec.4 need manual steps to be able to scale new Machines. 
+matchingRules:
+- type: Always
diff --git a/blocked-edges/4.18.0-rc.2-MachineConfigServerCARotation.yaml b/blocked-edges/4.18.0-rc.2-MachineConfigServerCARotation.yaml
new file mode 100644
index 000000000..c8e65c666
--- /dev/null
+++ b/blocked-edges/4.18.0-rc.2-MachineConfigServerCARotation.yaml
@@ -0,0 +1,8 @@
+to: 4.18.0-rc.2
+from: 4[.]18[.]0-ec[.]4[+].*
+url: https://issues.redhat.com/browse/MCO-1481
+name: MachineConfigServerCARotation
+message: |-
+  4.18.0-ec.4 adjusted machine-config server CA management.  The change was reverted in 4.18.0-rc.0, but clusters running 4.18.0-ec.4 need manual steps to be able to scale new Machines. 
+matchingRules:
+- type: Always