diff --git a/deps/v8/include/v8-version.h b/deps/v8/include/v8-version.h
index da386ccda1a..a3c31c5b29c 100644
--- a/deps/v8/include/v8-version.h
+++ b/deps/v8/include/v8-version.h
@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 12
 #define V8_MINOR_VERSION 4
 #define V8_BUILD_NUMBER 254
-#define V8_PATCH_LEVEL 19
+#define V8_PATCH_LEVEL 20
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
diff --git a/deps/v8/src/ast/scopes.cc b/deps/v8/src/ast/scopes.cc
index 39e3a8d5d59..2aa1bb6c0f8 100644
--- a/deps/v8/src/ast/scopes.cc
+++ b/deps/v8/src/ast/scopes.cc
@@ -2445,7 +2445,7 @@ bool Scope::MustAllocate(Variable* var) {
     var->set_is_used();
     if (inner_scope_calls_eval_ && !var->is_this()) var->SetMaybeAssigned();
   }
-  DCHECK(!var->has_forced_context_allocation() || var->is_used());
+  CHECK(!var->has_forced_context_allocation() || var->is_used());
   // Global variables do not need to be allocated.
   return !var->IsGlobalObjectProperty() && var->is_used();
 }
diff --git a/deps/v8/src/parsing/parser-base.h b/deps/v8/src/parsing/parser-base.h
index 009befd607b..6001ea622df 100644
--- a/deps/v8/src/parsing/parser-base.h
+++ b/deps/v8/src/parsing/parser-base.h
@@ -2661,6 +2661,7 @@ typename ParserBase<Impl>::BlockT ParserBase<Impl>::ParseClassStaticBlock(
   }
 
   FunctionState initializer_state(&function_state_, &scope_, initializer_scope);
+  FunctionParsingScope body_parsing_scope(impl());
   AcceptINScope accept_in(this, true);
 
   // Each static block has its own var and lexical scope, so make a new var