diff --git a/setup.py b/setup.py
index 99e501d9f..cd2006f71 100644
--- a/setup.py
+++ b/setup.py
@@ -1017,7 +1017,7 @@ setup(
         "py_ecc==5.2.0",
         "milagro_bls_binding==1.6.3",
         "dataclasses==0.6",
-        "remerkleable==0.1.19",
+        "remerkleable==0.1.20",
         RUAMEL_YAML_VERSION,
         "lru-dict==1.1.6",
         MARKO_VERSION,
diff --git a/tests/core/pyspec/eth2spec/utils/ssz/ssz_typing.py b/tests/core/pyspec/eth2spec/utils/ssz/ssz_typing.py
index 9b18f8bda..5a1b61d0b 100644
--- a/tests/core/pyspec/eth2spec/utils/ssz/ssz_typing.py
+++ b/tests/core/pyspec/eth2spec/utils/ssz/ssz_typing.py
@@ -2,6 +2,7 @@
 # Ignore linter: This module makes importing SSZ types easy, and hides away the underlying library from the spec.
 
 from remerkleable.complex import Container, Vector, List
+from remerkleable.union import Union
 from remerkleable.basic import boolean, bit, uint, byte, uint8, uint16, uint32, uint64, uint128, uint256
 from remerkleable.bitfields import Bitvector, Bitlist
 from remerkleable.byte_arrays import ByteVector, Bytes1, Bytes4, Bytes8, Bytes32, Bytes48, Bytes96, ByteList