diff --git a/src/coreclr/src/gc/gc.cpp b/src/coreclr/src/gc/gc.cpp
index 6eb6142f27b7b..0efd127445073 100644
--- a/src/coreclr/src/gc/gc.cpp
+++ b/src/coreclr/src/gc/gc.cpp
@@ -40519,6 +40519,9 @@ void PopulateDacVars(GcDacVars *gcDacVars)
 #ifndef DACCESS_COMPILE
     assert(gcDacVars != nullptr);
     *gcDacVars = {};
+    // Note: these version numbers are not actually checked by SOS, so if you change
+    // the GC in a way that makes it incompatible with SOS, please change
+    // SOS_BREAKING_CHANGE_VERSION in both the runtime and the diagnostics repo
     gcDacVars->major_version_number = 1;
     gcDacVars->minor_version_number = 0;
     gcDacVars->built_with_svr = &g_built_with_svr_gc;
diff --git a/src/coreclr/src/inc/sospriv.idl b/src/coreclr/src/inc/sospriv.idl
index dae0a4ff52088..6da8b5814f7ee 100644
--- a/src/coreclr/src/inc/sospriv.idl
+++ b/src/coreclr/src/inc/sospriv.idl
@@ -413,7 +413,7 @@ interface ISOSDacInterface8 : IUnknown
 // Increment anytime there is a change in the data structures that SOS depends on like
 // stress log structs (StressMsg, StressLogChunck, ThreadStressLog, etc), exception
 // stack traces (StackTraceElement), the PredefinedTlsSlots enums, etc.
-cpp_quote("#define SOS_BREAKING_CHANGE_VERSION 1")
+cpp_quote("#define SOS_BREAKING_CHANGE_VERSION 2")
 
 [
     object,
diff --git a/src/coreclr/src/pal/prebuilt/inc/sospriv.h b/src/coreclr/src/pal/prebuilt/inc/sospriv.h
index e1cbc05e9028a..38bb6791ea177 100644
--- a/src/coreclr/src/pal/prebuilt/inc/sospriv.h
+++ b/src/coreclr/src/pal/prebuilt/inc/sospriv.h
@@ -2675,7 +2675,7 @@ EXTERN_C const IID IID_ISOSDacInterface8;
 /* interface __MIDL_itf_sospriv_0000_0012 */
 /* [local] */ 
 
-#define SOS_BREAKING_CHANGE_VERSION 1
+#define SOS_BREAKING_CHANGE_VERSION 2
 
 
 extern RPC_IF_HANDLE __MIDL_itf_sospriv_0000_0012_v0_0_c_ifspec;