diff --git a/personal_python_ast_optimizer/parser/skipper.py b/personal_python_ast_optimizer/parser/skipper.py
index aff7a1b..1806920 100644
--- a/personal_python_ast_optimizer/parser/skipper.py
+++ b/personal_python_ast_optimizer/parser/skipper.py
@@ -820,6 +820,10 @@ def _ast_constants_operation(  # noqa: C901, PLR0912
                 result = left_value > right_value  # type: ignore
             case ast.GtE():
                 result = left_value >= right_value  # type: ignore
+            case ast.Is():
+                result = left_value is right_value
+            case ast.IsNot():
+                result = left_value is not right_value
             case _:
                 raise ValueError(f"Invalid operation: {operation.__class__.__name__}")
 
diff --git a/tests/parser/test_constant_folding.py b/tests/parser/test_constant_folding.py
index b0ee165..4b1685b 100644
--- a/tests/parser/test_constant_folding.py
+++ b/tests/parser/test_constant_folding.py
@@ -11,6 +11,8 @@
     BeforeAndAfter("a=64|1", "a=65"),
     BeforeAndAfter("a=7&3", "a=3"),
     BeforeAndAfter("a=3^6", "a=5"),
+    BeforeAndAfter("a='a' is 'b'", "a=False"),
+    BeforeAndAfter("a='a' is not 'b'", "a=True"),
 ]
 
 
diff --git a/version.txt b/version.txt
index cd1d2e9..8b22a32 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-8.0.1
+8.0.2