diff --git a/README.md b/README.md
index 3450233..b793813 100644
--- a/README.md
+++ b/README.md
@@ -527,9 +527,9 @@ The code has been updated to support compiler:
 
 ```bash
 $ moon version --all
-moon 0.1.20240914 (e22cb71 2024-09-14) ~/.moon/bin/moon
-moonc v0.1.20240914+b541585d3 ~/.moon/bin/moonc
-moonrun 0.1.20240914 (e22cb71 2024-09-14) ~/.moon/bin/moonrun
+moon 0.1.20241011 (ca50f51 2024-10-11) ~/.moon/bin/moon
+moonc v0.1.20241011+9ea637707 ~/.moon/bin/moonc
+moonrun 0.1.20241011 (ca50f51 2024-10-11) ~/.moon/bin/moonrun
 ```
 
 Use `moonup` to manage `moon` compiler versions:
diff --git a/examples/arrays/strings.mbt b/examples/arrays/strings.mbt
index e65dbb4..c08bffa 100644
--- a/examples/arrays/strings.mbt
+++ b/examples/arrays/strings.mbt
@@ -4,7 +4,7 @@ pub fn process_strings(strings : Array[String]) -> Array[String] {
   strings.eachi(
     fn(index, value) {
       parts.push(value)
-      strings[index] = parts.join("|")
+      strings[index] = String::concat(parts, separator="|")
     },
   )
   strings
diff --git a/moon.mod.json b/moon.mod.json
index 303d072..90a9735 100644
--- a/moon.mod.json
+++ b/moon.mod.json
@@ -1,6 +1,6 @@
 {
   "name": "extism/moonbit-pdk",
-  "version": "0.40.0",
+  "version": "0.41.0",
   "deps": {},
   "readme": "README.md",
   "repository": "https://github.com/extism/moonbit-pdk",
diff --git a/pdk/host/memory.mbt b/pdk/host/memory.mbt
index ac84ecc..9bf55e7 100644
--- a/pdk/host/memory.mbt
+++ b/pdk/host/memory.mbt
@@ -61,9 +61,9 @@ pub fn to_string(self : Memory) -> String {
 pub fn to_int(self : Memory) -> Int {
   let bytes = self.to_bytes()
   bytes[0].to_int() +
-  bytes[1].to_int().lsl(8) +
-  bytes[2].to_int().lsl(16) +
-  bytes[3].to_int().lsl(24)
+  (bytes[1].to_int() << 8) +
+  (bytes[2].to_int() << 16) +
+  (bytes[3].to_int() << 24)
 }
 
 /// `to_bytes` reads the (unprocessed) bytes residing in the host memory
diff --git a/pdk/string.mbt b/pdk/string.mbt
index b3fb437..f9cbe87 100644
--- a/pdk/string.mbt
+++ b/pdk/string.mbt
@@ -33,7 +33,7 @@ pub impl ToUtf16 for Bytes with to_utf16(b : Bytes) -> String {
   // For now, support ASCII.
   // https://github.com/moonbitlang/core/issues/484
   let length = b.length()
-  let buf = Buffer::new(size_hint=2 * length)
+  let buf = @buffer.new(size_hint=2 * length)
   for i = 0; i < length; i = i + 1 {
     let byte = b[i].to_int()
     let char = Char::from_int(byte)
diff --git a/pdk/var/var.mbt b/pdk/var/var.mbt
index f190cc3..7a17f1f 100644
--- a/pdk/var/var.mbt
+++ b/pdk/var/var.mbt
@@ -56,9 +56,9 @@ pub fn set_int(key : String, value : Int) -> Unit {
   let key_mem = @host.allocate_string(key)
   let bytes = Bytes::new(4)
   bytes[0] = value.land(255).to_byte()
-  bytes[1] = value.lsr(8).land(255).to_byte()
-  bytes[2] = value.lsr(16).land(255).to_byte()
-  bytes[3] = value.lsr(24).land(255).to_byte()
+  bytes[1] = (value >> 8).land(255).to_byte()
+  bytes[2] = (value >> 16).land(255).to_byte()
+  bytes[3] = (value >> 24).land(255).to_byte()
   let val_mem = @host.allocate_bytes(bytes)
   @extism.var_set(key_mem.offset, val_mem.offset)
   key_mem.free()