diff --git a/tailcfg/tailcfg.go b/tailcfg/tailcfg.go
index 8ab7baf3c..18076914c 100644
--- a/tailcfg/tailcfg.go
+++ b/tailcfg/tailcfg.go
@@ -141,7 +141,8 @@
 //   - 98: 2024-06-13: iOS/tvOS clients may provide serial number as part of posture information
 //   - 99: 2024-06-14: Client understands NodeAttrDisableLocalDNSOverrideViaNRPT
 //   - 100: 2024-06-18: Client supports filtertype.Match.SrcCaps (issue #12542)
-const CurrentCapabilityVersion CapabilityVersion = 100
+//   - 101: 2024-07-01: Client supports SSH agent forwarding when handling connections with /bin/su
+const CurrentCapabilityVersion CapabilityVersion = 101
 
 type StableID string