diff --git a/setup.cfg b/setup.cfg
index 169237ce8a..730939c928 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -173,7 +173,7 @@ tools =
     platformdirs>=4.2,<5
 
 doc =
-    docc>=0.2.0,<0.3.0
+    docc>=0.2.2,<0.3.0
     fladrif>=0.2.0,<0.3.0
 
 optimized =
diff --git a/src/ethereum/genesis.py b/src/ethereum/genesis.py
index 57a62c5798..a7b515b309 100644
--- a/src/ethereum/genesis.py
+++ b/src/ethereum/genesis.py
@@ -115,9 +115,7 @@ def get_genesis_configuration(genesis_file: str) -> GenesisConfiguration:
 
 def hex_or_base_10_str_to_u256(balance: str) -> U256:
     """
-    Convert a string in either hexadecimal or base-10 to a [`U256`].
-
-    [`U256`]: ref:ethereum.base_types.U256
+    Convert a string in either hexadecimal or base-10 to a `U256`.
     """
     if balance.startswith("0x"):
         return hex_to_u256(balance)