diff --git a/kmir/k-src/mir-lexer-syntax.md b/kmir/k-src/mir-lexer-syntax.md
index f5044fe8d..da463a2d6 100644
--- a/kmir/k-src/mir-lexer-syntax.md
+++ b/kmir/k-src/mir-lexer-syntax.md
@@ -34,7 +34,7 @@ Primitive types (in literal format) used in MIR.
 //TODO： locate the code defines the primitive types in MIR.
 //Do we need to redefine regular expression? Maybe move to Type File
   syntax UnsignedLiteral ::= r"[0-9]+_(usize|u8|u16|u32|u64|u128)" [token]
-  syntax SignedLiteral ::= r"[-]?[0-9]+_(isize|i8|i16|i32|i64|i128)" [token]
+  syntax SignedLiteral ::= r"-?[0-9]+_(isize|i8|i16|i32|i64|i128)" [token]
   syntax FloatLiteral ::= r"-?[0-9]+(.[0-9]+)?((E|e)(\\+|-)?[0-9]+)?(f32|f64)" [token]
   syntax HexLiteral ::= r"0x[0-9a-fA-F]+"  [token]
   syntax StringLiteral ::= r"[\\\"]([^\\\"\\\\\\n]|\\\\[\\\"'nrt0\\\\]|\\\\x[0-7][0-9a-fA-F]|\\\\u\\{[0-9a-fA-F]+\\}|\\\\u[0-9a-fA-F]([0-9a-fA-F]([0-9a-fA-F]([0-9a-fA-F]([0-9a-fA-F][0-9a-fA-F]?)?)?)?)?|\\\\\\n)*[\\\"]"  [token, prec(-1)]
@@ -63,7 +63,7 @@ Types such as structs, tuples and unions, which has fields (indexed by `VariantI
 ```
 
 ```k
-  syntax AllocReferenceToken ::= r"#\\(-*alloc[0-9]+(?:\\+0x[0-9a-fA-F]+)?-*\\)#"  [token]
+  syntax AllocReferenceToken ::= r"#\\(-*alloc[0-9]+(\\+0x[0-9a-fA-F]+)?-*\\)#"  [token]
   syntax DoubleHexDigitNoIntLetter ::= r"[a-fA-F][0-9a-fA-F]" [token]
   syntax DoubleHexDigitNoIntDigit ::= r"[0-9][a-fA-F]" [token]
 ```
diff --git a/kmir/pyproject.toml b/kmir/pyproject.toml
index 2c2cbd011..1cf43803f 100644
--- a/kmir/pyproject.toml
+++ b/kmir/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "kmir"
-version = "0.2.52"
+version = "0.2.53"
 description = ""
 authors = [
     "Runtime Verification, Inc. <contact@runtimeverification.com>",
diff --git a/kmir/src/kmir/__init__.py b/kmir/src/kmir/__init__.py
index 9c0fc9d36..d7edaaa3f 100644
--- a/kmir/src/kmir/__init__.py
+++ b/kmir/src/kmir/__init__.py
@@ -2,4 +2,4 @@
 
 from .kmir import KMIR
 
-VERSION: Final = '0.2.52'
+VERSION: Final = '0.2.53'
diff --git a/package/version b/package/version
index d0caa6cf5..0258f95ef 100644
--- a/package/version
+++ b/package/version
@@ -1 +1 @@
-0.2.52
+0.2.53