diff --git a/tests/cis_tests/util/migration/util_migrate_state_indexes.py b/tests/cis_tests/util/migration/util_migrate_state_indexes.py
index be5eb506a..3b72090f3 100644
--- a/tests/cis_tests/util/migration/util_migrate_state_indexes.py
+++ b/tests/cis_tests/util/migration/util_migrate_state_indexes.py
@@ -53,7 +53,16 @@ def findIndexDirs(root: Path) -> list[Path]:
 if confirm != 'y':
     print("Exiting without making any changes.")
     exit(0)
+        
+
+def migrateInstrumentState(jDict: dict, indexEntry: IndexEntry, runNumber):
+    jDict["instrumentState"]["instrumentConfig"]["indexEntry"] = indexEntry.model_dump()
+    # migrate detectorState
+    if "detectorState" in jDict["instrumentState"]:
+        _, detectorState = lds.generateStateId(runNumber)
+        jDict["instrumentState"]["detectorState"] = detectorState.model_dump()
     
+    return jDict
 
 def stageMigrationIndexDir(indexDir: Path):
     
@@ -91,13 +100,18 @@ def stageMigrationIndexDir(indexDir: Path):
             # add the indexEntry to the dict
             jDict["indexEntry"] = entry.model_dump()
             
+            # Update NESTED indexedObjects
             # if the file is a "record" we also need to update its "calculationParameters" to match the version of the indexEntry
             if "calculationParameters" in jDict:
+                # this is the historic snapinstprm for a given run, which is included in the calibration parameters
+                # as "instrumentState"
+                snapInstPrmEntry = instParamIndexer.latestApplicableEntry(jDict["runNumber"])
                 jDict["calculationParameters"]["indexEntry"] = entry.model_dump()
-                jDict["calculationParameters"]["instrumentState"]["instrumentConfig"]["indexEntry"] = instParamIndexer.latestApplicableEntry(jDict["runNumber"]).model_dump()
+                jDict["calculationParameters"] = migrateInstrumentState(jDict["calculationParameters"], snapInstPrmEntry, jDict["runNumber"])
             if "instrumentState" in jDict:
-                jDict["instrumentState"]["instrumentConfig"]["indexEntry"] = instParamIndexer.latestApplicableEntry(jDict["seedRun"]).model_dump()
-            
+                snapInstPrmEntry = instParamIndexer.latestApplicableEntry(jDict["seedRun"])
+                jDict = migrateInstrumentState(jDict, snapInstPrmEntry, jDict["seedRun"])
+
             # write the dict back to the json file
             # find common root of stageDir and jsonFile
             stagedJsonFile = stageDir / jsonFile.relative_to(calibrationRoot)