diff --git a/common.gypi b/common.gypi
index 686fc122383cb3..a2937460b5a897 100644
--- a/common.gypi
+++ b/common.gypi
@@ -38,7 +38,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.18',
+    'v8_embedder_string': '-node.20',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/src/heap/base/asm/s390/push_registers_asm.cc b/deps/v8/src/heap/base/asm/s390/push_registers_asm.cc
index ef954fa03ae8f2..80b6cf0664d627 100644
--- a/deps/v8/src/heap/base/asm/s390/push_registers_asm.cc
+++ b/deps/v8/src/heap/base/asm/s390/push_registers_asm.cc
@@ -21,17 +21,17 @@ asm(".text                                              \n"
     "PushAllRegistersAndIterateStack:                   \n"
     // Push all callee-saved registers.
     // r6-r13, r14 and sp(r15)
-    "  stmg %r6, %sp, 48(%sp)                           \n"
+    "  stmg %r6, %r15, 48(%r15)                         \n"
     // Allocate frame.
-    "  lay %sp, -160(%sp)                               \n"
+    "  lay %r15, -160(%r15)                             \n"
     // Pass 1st parameter (r2) unchanged (Stack*).
     // Pass 2nd parameter (r3) unchanged (StackVisitor*).
     // Save 3rd parameter (r4; IterateStackCallback).
     "  lgr %r5, %r4                                     \n"
     // Pass sp as 3rd parameter. 160+48 to point
     // to callee saved region stored above.
-    "  lay %r4, 208(%sp)                                \n"
+    "  lay %r4, 208(%r15)                               \n"
     // Call the callback.
     "  basr %r14, %r5                                   \n"
-    "  lmg %r14,%sp, 272(%sp)                           \n"
+    "  lmg %r14,%r15, 272(%r15)                         \n"
     "  br %r14                                          \n");
diff --git a/deps/v8/src/wasm/baseline/ppc/liftoff-assembler-ppc-inl.h b/deps/v8/src/wasm/baseline/ppc/liftoff-assembler-ppc-inl.h
index 7ab51af2be9e68..2256229f868c56 100644
--- a/deps/v8/src/wasm/baseline/ppc/liftoff-assembler-ppc-inl.h
+++ b/deps/v8/src/wasm/baseline/ppc/liftoff-assembler-ppc-inl.h
@@ -2893,14 +2893,38 @@ void LiftoffAssembler::CallC(const std::initializer_list<VarState> args,
       parallel_move.LoadIntoRegister(LiftoffRegister{kCArgRegs[reg_args]}, arg);
       ++reg_args;
     } else {
-      int bias = 0;
-      // On BE machines values with less than 8 bytes are right justified.
-      // bias here is relative to the stack pointer.
-      if (arg.kind() == kI32 || arg.kind() == kF32) bias = -stack_bias;
       int offset =
           (kStackFrameExtraParamSlot + stack_args) * kSystemPointerSize;
-      MemOperand dst{sp, offset + bias};
-      liftoff::StoreToMemory(this, dst, arg, r0, ip);
+      MemOperand dst{sp, offset};
+      Register scratch1 = r0;
+      Register scratch2 = ip;
+      if (arg.is_reg()) {
+        switch (arg.kind()) {
+          case kI16:
+            extsh(scratch1, arg.reg().gp());
+            StoreU64(scratch1, dst);
+            break;
+          case kI32:
+            extsw(scratch1, arg.reg().gp());
+            StoreU64(scratch1, dst);
+            break;
+          case kI64:
+            StoreU64(arg.reg().gp(), dst);
+            break;
+          default:
+            UNREACHABLE();
+        }
+      } else if (arg.is_const()) {
+        mov(scratch1, Operand(static_cast<int64_t>(arg.i32_const())));
+        StoreU64(scratch1, dst);
+      } else if (value_kind_size(arg.kind()) == 4) {
+        LoadS32(scratch1, liftoff::GetStackSlot(arg.offset()), scratch2);
+        StoreU64(scratch1, dst);
+      } else {
+        DCHECK_EQ(8, value_kind_size(arg.kind()));
+        LoadU64(scratch1, liftoff::GetStackSlot(arg.offset()), scratch1);
+        StoreU64(scratch1, dst);
+      }
       ++stack_args;
     }
   }
diff --git a/deps/v8/src/wasm/baseline/s390/liftoff-assembler-s390-inl.h b/deps/v8/src/wasm/baseline/s390/liftoff-assembler-s390-inl.h
index bfd1eaf61e69f0..0be7b0e880a543 100644
--- a/deps/v8/src/wasm/baseline/s390/liftoff-assembler-s390-inl.h
+++ b/deps/v8/src/wasm/baseline/s390/liftoff-assembler-s390-inl.h
@@ -3271,14 +3271,37 @@ void LiftoffAssembler::CallC(const std::initializer_list<VarState> args,
       parallel_move.LoadIntoRegister(LiftoffRegister{kCArgRegs[reg_args]}, arg);
       ++reg_args;
     } else {
-      int bias = 0;
-      // On BE machines values with less than 8 bytes are right justified.
-      // bias here is relative to the stack pointer.
-      if (arg.kind() == kI32 || arg.kind() == kF32) bias = -stack_bias;
       int offset =
           (kStackFrameExtraParamSlot + stack_args) * kSystemPointerSize;
-      MemOperand dst{sp, offset + bias};
-      liftoff::StoreToMemory(this, dst, arg, ip);
+      MemOperand dst{sp, offset};
+      Register scratch = ip;
+      if (arg.is_reg()) {
+        switch (arg.kind()) {
+          case kI16:
+            LoadS16(scratch, arg.reg().gp());
+            StoreU64(scratch, dst);
+            break;
+          case kI32:
+            LoadS32(scratch, arg.reg().gp());
+            StoreU64(scratch, dst);
+            break;
+          case kI64:
+            StoreU64(arg.reg().gp(), dst);
+            break;
+          default:
+            UNREACHABLE();
+        }
+      } else if (arg.is_const()) {
+        mov(scratch, Operand(static_cast<int64_t>(arg.i32_const())));
+        StoreU64(scratch, dst);
+      } else if (value_kind_size(arg.kind()) == 4) {
+        LoadS32(scratch, liftoff::GetStackSlot(arg.offset()), scratch);
+        StoreU64(scratch, dst);
+      } else {
+        DCHECK_EQ(8, value_kind_size(arg.kind()));
+        LoadU64(scratch, liftoff::GetStackSlot(arg.offset()), scratch);
+        StoreU64(scratch, dst);
+      }
       ++stack_args;
     }
   }