diff --git a/test_libs/pyspec/tests/conftest.py b/test_libs/pyspec/tests/conftest.py
index f6c70d280..9840dc7b2 100644
--- a/test_libs/pyspec/tests/conftest.py
+++ b/test_libs/pyspec/tests/conftest.py
@@ -22,8 +22,8 @@ def config(request):
 
 
 @pytest.fixture
-def num_validators():
-    return 100
+def num_validators(config):
+    return spec.SLOTS_PER_EPOCH * 8
 
 
 @pytest.fixture
diff --git a/test_libs/pyspec/tests/helpers.py b/test_libs/pyspec/tests/helpers.py
index a728a6acc..b30aaf35e 100644
--- a/test_libs/pyspec/tests/helpers.py
+++ b/test_libs/pyspec/tests/helpers.py
@@ -48,7 +48,7 @@ from eth2spec.utils.merkle_minimal import (
 )
 
 
-privkeys = [i + 1 for i in range(1000)]
+privkeys = [i + 1 for i in range(1024)]
 pubkeys = [bls.privtopub(privkey) for privkey in privkeys]
 pubkey_to_privkey = {pubkey: privkey for privkey, pubkey in zip(privkeys, pubkeys)}