diff --git a/common.gypi b/common.gypi
index 36e5de56341a51..88764c8f6b75a8 100644
--- a/common.gypi
+++ b/common.gypi
@@ -36,7 +36,7 @@
 
     # 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.17',
+    'v8_embedder_string': '-node.18',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/src/wasm/baseline/ppc/liftoff-assembler-ppc.h b/deps/v8/src/wasm/baseline/ppc/liftoff-assembler-ppc.h
index 4e99821a27d563..bedee1a939c007 100644
--- a/deps/v8/src/wasm/baseline/ppc/liftoff-assembler-ppc.h
+++ b/deps/v8/src/wasm/baseline/ppc/liftoff-assembler-ppc.h
@@ -137,7 +137,8 @@ void LiftoffAssembler::StoreTaggedPointer(Register dst_addr,
 void LiftoffAssembler::Load(LiftoffRegister dst, Register src_addr,
                             Register offset_reg, uintptr_t offset_imm,
                             LoadType type, LiftoffRegList pinned,
-                            uint32_t* protected_load_pc, bool is_load_mem) {
+                            uint32_t* protected_load_pc, bool is_load_mem,
+                            bool i64_offset) {
   bailout(kUnsupportedArchitecture, "Load");
 }
 
diff --git a/deps/v8/src/wasm/baseline/s390/liftoff-assembler-s390.h b/deps/v8/src/wasm/baseline/s390/liftoff-assembler-s390.h
index 8560c91553f8cc..04f30939fdbab6 100644
--- a/deps/v8/src/wasm/baseline/s390/liftoff-assembler-s390.h
+++ b/deps/v8/src/wasm/baseline/s390/liftoff-assembler-s390.h
@@ -277,11 +277,17 @@ void LiftoffAssembler::StoreTaggedPointer(Register dst_addr,
 void LiftoffAssembler::Load(LiftoffRegister dst, Register src_addr,
                             Register offset_reg, uintptr_t offset_imm,
                             LoadType type, LiftoffRegList pinned,
-                            uint32_t* protected_load_pc, bool is_load_mem) {
+                            uint32_t* protected_load_pc, bool is_load_mem,
+                            bool i64_offset) {
   UseScratchRegisterScope temps(this);
   if (!is_int20(offset_imm)) {
     mov(ip, Operand(offset_imm));
     if (offset_reg != no_reg) {
+      if (!i64_offset) {
+        // Clear the upper 32 bits of the 64 bit offset register.
+        llgfr(r0, offset_reg);
+        offset_reg = r0;
+      }
       AddS64(ip, offset_reg);
     }
     offset_reg = ip;