diff --git a/pyvaporation/__init__.py b/pyvaporation/__init__.py
index d59ef76..ab3ee92 100644
--- a/pyvaporation/__init__.py
+++ b/pyvaporation/__init__.py
@@ -52,3 +52,5 @@
     "Component",
     "Components",
 ]
+
+__version__ = "1.1.6"
diff --git a/pyvaporation/mixtures/mixture.py b/pyvaporation/mixtures/mixture.py
index faf974b..f59d79d 100644
--- a/pyvaporation/mixtures/mixture.py
+++ b/pyvaporation/mixtures/mixture.py
@@ -7,11 +7,6 @@
 from ..utils import NRTLParameters, R
 
 
-def _is_in_0_to_1_range(instance: typing.Any, attribute, value: float) -> None:
-    if not 0 <= value <= 1:
-        raise ValueError("Give %s value is not in [0, 1] range" % value)
-
-
 class CompositionType:
     """
     A class to describe type of the composition
@@ -39,9 +34,15 @@ class Composition:
     A class to represent composition of the mixtures
     """
 
-    p: float = attr.ib(validator=_is_in_0_to_1_range)
+    p: float
     type: str
 
+    def __attrs_post_init__(self):
+        if self.p < 0:
+            self.p = 0
+        if self.p > 1:
+            self.p = 1
+
     @property
     def first(self) -> float:
         """
diff --git a/setup.py b/setup.py
index 24710ff..1cd03e6 100644
--- a/setup.py
+++ b/setup.py
@@ -3,11 +3,11 @@
 setup(
     name="pyvaporation",
     packages=find_packages(),
-    version="1.1.5",
+    version="1.1.6",
     license="Apache license 2.0",
     description="Set of tools for modelling pervaporation processes",
     author="Denis Sapegin, Aleksei Chekmachev",
-    author_email="a.checkmachev@gmail.com",
+    author_email="dasapegin@sr-systems.ru",
     url="https://github.com/Membrizard/PyVaporation",
     download_url="https://github.com/Membrizard/PyVaporation/archive/refs/tags/v1.1.5.tar.gz",
     long_description=open("README.md", "r").read(),
diff --git a/tests/test_mixtures/test_mixture_methods.py b/tests/test_mixtures/test_mixture_methods.py
index f6a4028..4c1806a 100644
--- a/tests/test_mixtures/test_mixture_methods.py
+++ b/tests/test_mixtures/test_mixture_methods.py
@@ -174,3 +174,8 @@ def test_get_nrtl_partial_pressures_from_weight_composition():
             )
             < 1e-3
         )
+
+
+def test_invalid_compositions():
+    assert Composition(p=-1, type="weight") == Composition(p=0, type="weight")
+    assert Composition(p=2, type="weight") == Composition(p=1, type="weight")