diff --git a/FixtureAll-mainnet.md b/FixtureAll-mainnet.md
index c0037c8f8..1ef988daf 100644
--- a/FixtureAll-mainnet.md
+++ b/FixtureAll-mainnet.md
@@ -237,13 +237,16 @@ FixtureAll-mainnet
 + [Valid]   success                                                                          OK
 + [Valid]   success_already_exited_long_ago                                                  OK
 + [Valid]   success_already_exited_recent                                                    OK
++ [Valid]   success_attestation_from_future                                                  OK
 + [Valid]   success_block_header                                                             OK
++ [Valid]   success_block_header_from_future                                                 OK
 + [Valid]   success_double                                                                   OK
 + [Valid]   success_exit_queue                                                               OK
 + [Valid]   success_low_balances                                                             OK
 + [Valid]   success_misc_balances                                                            OK
 + [Valid]   success_multi_proposer_index_iterations                                          OK
 + [Valid]   success_previous_epoch                                                           OK
++ [Valid]   success_proposer_index_slashed                                                   OK
 + [Valid]   success_slashed_and_proposer_index_the_same                                      OK
 + [Valid]   success_surround                                                                 OK
 + [Valid]   success_with_effective_balance_disparity                                         OK
@@ -265,7 +268,7 @@ FixtureAll-mainnet
 + fork_random_low_balances                                                                   OK
 + fork_random_misc_balances                                                                  OK
 ```
-OK: 262/262 Fail: 0/262 Skip: 0/262
+OK: 265/265 Fail: 0/265 Skip: 0/265
 ## Official - Altair - Epoch Processing - Effective balance updates [Preset: mainnet]
 ```diff
 + Effective balance updates - effective_balance_hysteresis [Preset: mainnet]                 OK
@@ -483,4 +486,4 @@ OK: 1/1 Fail: 0/1 Skip: 0/1
 OK: 27/27 Fail: 0/27 Skip: 0/27
 
 ---TOTAL---
-OK: 393/393 Fail: 0/393 Skip: 0/393
+OK: 396/396 Fail: 0/396 Skip: 0/396
diff --git a/FixtureSSZConsensus-mainnet.md b/FixtureSSZConsensus-mainnet.md
index bc8056ce3..e05009a72 100644
--- a/FixtureSSZConsensus-mainnet.md
+++ b/FixtureSSZConsensus-mainnet.md
@@ -188,18 +188,21 @@ FixtureSSZConsensus-mainnet
 + [Valid]   success                                                                          OK
 + [Valid]   success_already_exited_long_ago                                                  OK
 + [Valid]   success_already_exited_recent                                                    OK
++ [Valid]   success_attestation_from_future                                                  OK
 + [Valid]   success_block_header                                                             OK
++ [Valid]   success_block_header_from_future                                                 OK
 + [Valid]   success_double                                                                   OK
 + [Valid]   success_exit_queue                                                               OK
 + [Valid]   success_low_balances                                                             OK
 + [Valid]   success_misc_balances                                                            OK
 + [Valid]   success_multi_proposer_index_iterations                                          OK
 + [Valid]   success_previous_epoch                                                           OK
++ [Valid]   success_proposer_index_slashed                                                   OK
 + [Valid]   success_slashed_and_proposer_index_the_same                                      OK
 + [Valid]   success_surround                                                                 OK
 + [Valid]   success_with_effective_balance_disparity                                         OK
 ```
-OK: 196/196 Fail: 0/196 Skip: 0/196
+OK: 199/199 Fail: 0/199 Skip: 0/199
 ## Official - Altair - SSZ consensus objects  [Preset: mainnet]
 ```diff
 +   Testing    AggregateAndProof                                                             OK
@@ -337,4 +340,4 @@ OK: 1/1 Fail: 0/1 Skip: 0/1
 OK: 27/27 Fail: 0/27 Skip: 0/27
 
 ---TOTAL---
-OK: 287/287 Fail: 0/287 Skip: 0/287
+OK: 290/290 Fail: 0/290 Skip: 0/290
diff --git a/tests/official/fixtures_utils.nim b/tests/official/fixtures_utils.nim
index 6d30b6920..bf418b3d1 100644
--- a/tests/official/fixtures_utils.nim
+++ b/tests/official/fixtures_utils.nim
@@ -43,7 +43,7 @@ type
 const
   FixturesDir* =
     currentSourcePath.rsplit(DirSep, 1)[0] / ".." / ".." / "vendor" / "nim-eth2-scenarios"
-  SszTestsDir* = FixturesDir / "tests-v1.1.0-alpha.7"
+  SszTestsDir* = FixturesDir / "tests-v1.1.0-alpha.8"
   MaxObjectSize* = 3_000_000
 
 proc parseTest*(path: string, Format: typedesc[Json], T: typedesc): T =
diff --git a/tests/official/test_fixture_const_sanity_check.nim b/tests/official/test_fixture_const_sanity_check.nim
index 24ee779bb..6a2439595 100644
--- a/tests/official/test_fixture_const_sanity_check.nim
+++ b/tests/official/test_fixture_const_sanity_check.nim
@@ -23,7 +23,7 @@ const
   SpecDir = currentSourcePath.rsplit(DirSep, 1)[0] /
                   ".."/".."/"beacon_chain"/"spec"
 
-  # v1.1.0-alpha.7 doesn't seem to have this file
+  # v1.1.0-alpha.8 doesn't seem to have this file
   OldSszTestsDir* = FixturesDir / "tests-v1.1.0-alpha.5"
   Config = OldSszTestsDir/const_preset/"config"/"phase0.yaml"
 
diff --git a/vendor/nim-eth2-scenarios b/vendor/nim-eth2-scenarios
index 7e7d89889..cd88325ff 160000
--- a/vendor/nim-eth2-scenarios
+++ b/vendor/nim-eth2-scenarios
@@ -1 +1 @@
-Subproject commit 7e7d8988979dfad2d3f4a06121f22df94e5101e5
+Subproject commit cd88325fff44e75b8c34123aebd1bfb2e9d9f287