diff --git a/kmir/pyproject.toml b/kmir/pyproject.toml
index 040fd58f2..de1b2f598 100644
--- a/kmir/pyproject.toml
+++ b/kmir/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "kmir"
-version = "0.3.154"
+version = "0.3.155"
 description = ""
 requires-python = "~=3.10"
 dependencies = [
diff --git a/kmir/src/kmir/__init__.py b/kmir/src/kmir/__init__.py
index b3414ef65..3bd862c04 100644
--- a/kmir/src/kmir/__init__.py
+++ b/kmir/src/kmir/__init__.py
@@ -1,3 +1,3 @@
 from typing import Final
 
-VERSION: Final = '0.3.154'
+VERSION: Final = '0.3.155'
diff --git a/kmir/src/kmir/kdist/mir-semantics/rt/data.md b/kmir/src/kmir/kdist/mir-semantics/rt/data.md
index fac0115fc..e65426e32 100644
--- a/kmir/src/kmir/kdist/mir-semantics/rt/data.md
+++ b/kmir/src/kmir/kdist/mir-semantics/rt/data.md
@@ -1305,6 +1305,22 @@ One important use case of `UbChecks` is to determine overflows in unchecked arit
 `nullOpAlignOf`
 `nullOpOffsetOf(VariantAndFieldIndices)`
 
+```k
+// FIXME: 64 is hardcoded since usize not supported
+rule <k> rvalueNullaryOp(nullOpAlignOf, TY)
+      =>
+         typedValue(
+           Integer(#alignOf({TYPEMAP[TY]}:>TypeInfo), 64, false),
+           TyUnknown,
+           mutabilityNot
+         )
+         ...
+     </k>
+     <types> TYPEMAP </types>
+    requires TY in_keys(TYPEMAP)
+     andBool isTypeInfo(TYPEMAP[TY])
+```
+
 #### Other operations
 
 `binOpOffset`
diff --git a/kmir/src/kmir/kdist/mir-semantics/rt/numbers.md b/kmir/src/kmir/kdist/mir-semantics/rt/numbers.md
index 7b54e54d0..7d16c36ef 100644
--- a/kmir/src/kmir/kdist/mir-semantics/rt/numbers.md
+++ b/kmir/src/kmir/kdist/mir-semantics/rt/numbers.md
@@ -150,6 +150,31 @@ This truncation function is instrumental in the implementation of Integer arithm
     [preserves-definedness] // positive shift, divisor non-zero
 ```
 
+## Alignment of Primitives
+
+```k
+// FIXME: Alignment is platform specific
+syntax Int ::= #alignOf( TypeInfo ) [function]
+rule #alignOf( typeInfoPrimitiveType(primTypeBool) )        => 1
+rule #alignOf( typeInfoPrimitiveType(primTypeChar) )        => 4
+rule #alignOf( typeInfoPrimitiveType(primTypeInt(intTyIsize)) )  => 8 // FIXME: Hard coded since usize not implemented
+rule #alignOf( typeInfoPrimitiveType(primTypeInt(intTyI8)) )     => 1
+rule #alignOf( typeInfoPrimitiveType(primTypeInt(intTyI16)) )    => 2
+rule #alignOf( typeInfoPrimitiveType(primTypeInt(intTyI32)) )    => 4
+rule #alignOf( typeInfoPrimitiveType(primTypeInt(intTyI64)) )    => 8
+rule #alignOf( typeInfoPrimitiveType(primTypeInt(intTyI128)) )   => 16
+rule #alignOf( typeInfoPrimitiveType(primTypeUint(uintTyUsize)) ) => 8 // FIXME: Hard coded since usize not implemented
+rule #alignOf( typeInfoPrimitiveType(primTypeUint(uintTyU8)) )    => 1
+rule #alignOf( typeInfoPrimitiveType(primTypeUint(uintTyU16)) )   => 2
+rule #alignOf( typeInfoPrimitiveType(primTypeUint(uintTyU32)) )   => 4
+rule #alignOf( typeInfoPrimitiveType(primTypeUint(uintTyU64)) )   => 8
+rule #alignOf( typeInfoPrimitiveType(primTypeUint(uintTyU128)) )  => 16
+rule #alignOf( typeInfoPrimitiveType(primTypeFloat(floatTyF16)) )  => 2
+rule #alignOf( typeInfoPrimitiveType(primTypeFloat(floatTyF32)) )  => 4
+rule #alignOf( typeInfoPrimitiveType(primTypeFloat(floatTyF64)) )  => 8
+rule #alignOf( typeInfoPrimitiveType(primTypeFloat(floatTyF128)) ) => 16
+```
+
 ```k
 endmodule
 ```
\ No newline at end of file
diff --git a/kmir/uv.lock b/kmir/uv.lock
index 6f0c754dd..efb21301a 100644
--- a/kmir/uv.lock
+++ b/kmir/uv.lock
@@ -488,7 +488,7 @@ wheels = [
 
 [[package]]
 name = "kmir"
-version = "0.3.154"
+version = "0.3.155"
 source = { editable = "." }
 dependencies = [
     { name = "kframework" },
diff --git a/package/version b/package/version
index 589f2dfa3..9ad723c36 100644
--- a/package/version
+++ b/package/version
@@ -1 +1 @@
-0.3.154
+0.3.155