diff --git a/poky/meta/classes/sstate.bbclass b/poky/meta/classes/sstate.bbclass
index b1c608d..3a3f7cc 100644
--- a/poky/meta/classes/sstate.bbclass
+++ b/poky/meta/classes/sstate.bbclass
@@ -319,6 +319,8 @@
     if os.path.exists(i):
         with open(i, "r") as f:
             manifests = f.readlines()
+    # We append new entries, we don't remove older entries which may have the same
+    # manifest name but different versions from stamp/workdir. See below.
     if filedata not in manifests:
         with open(i, "a+") as f:
             f.write(filedata)
@@ -704,6 +706,8 @@
 
     return
 
+sstate_package[vardepsexclude] += "SSTATE_SIG_KEY"
+
 def pstaging_fetch(sstatefetch, d):
     import bb.fetch2
 
@@ -1183,11 +1187,21 @@
         i = d.expand("${SSTATE_MANIFESTS}/index-" + a)
         if not os.path.exists(i):
             continue
+        manseen = set()
+        ignore = []
         with open(i, "r") as f:
             lines = f.readlines()
-            for l in lines:
+            for l in reversed(lines):
                 try:
                     (stamp, manifest, workdir) = l.split()
+                    # The index may have multiple entries for the same manifest as the code above only appends
+                    # new entries and there may be an entry with matching manifest but differing version in stamp/workdir.
+                    # The last entry in the list is the valid one, any earlier entries with matching manifests
+                    # should be ignored.
+                    if manifest in manseen:
+                        ignore.append(l)
+                        continue
+                    manseen.add(manifest)
                     if stamp not in stamps and stamp not in preservestamps and stamp in machineindex:
                         toremove.append(l)
                         if stamp not in seen:
@@ -1218,6 +1232,8 @@
 
         with open(i, "w") as f:
             for l in lines:
+                if l in ignore:
+                    continue
                 f.write(l)
     machineindex |= set(stamps)
     with open(mi, "w") as f: