diff --git a/test_libs/pyspec/requirements.txt b/test_libs/pyspec/requirements.txt
index eed0d5a7d..2de2aa84b 100644
--- a/test_libs/pyspec/requirements.txt
+++ b/test_libs/pyspec/requirements.txt
@@ -3,4 +3,4 @@ eth-typing>=2.1.0,<3.0.0
 pycryptodome==3.7.3
 py_ecc>=1.6.0
 typing_inspect==0.4.0
-ssz==0.1.0a9
+ssz==0.1.0a10
diff --git a/test_libs/pyspec/setup.py b/test_libs/pyspec/setup.py
index 49f3c84a1..3856640ab 100644
--- a/test_libs/pyspec/setup.py
+++ b/test_libs/pyspec/setup.py
@@ -10,6 +10,6 @@ setup(
         "pycryptodome==3.7.3",
         "py_ecc>=1.6.0",
         "typing_inspect==0.4.0",
-        "ssz==0.1.0a9"
+        "ssz==0.1.0a10"
     ]
 )