diff --git a/README.rst b/README.rst
index 7814f71b1..7abdbd655 100644
--- a/README.rst
+++ b/README.rst
@@ -8,13 +8,8 @@ machine learning also called "descriptors" or "fingerprints". These representati
 can be used for atomistic machine learning (ml) models including ml potentials,
 visualization or similarity analysis.
 
-The core of the library is written in Rust and we provide
-APIs for C/C++ and Python as well.
-
-.. warning::
-
-    **Featomic is still as the proof of concept stage. You should not use it for
-    anything important.**
+The core of the library is written in Rust and we provide APIs for C/C++ and
+Python as well.
 
 List of implemented representations
 ###################################
diff --git a/python/featomic/build-backend/backend.py b/python/featomic/build-backend/backend.py
index 754daab94..b576cfc18 100644
--- a/python/featomic/build-backend/backend.py
+++ b/python/featomic/build-backend/backend.py
@@ -11,5 +11,5 @@ def get_requires_for_build_wheel(config_settings=None):
     defaults = build_meta.get_requires_for_build_wheel(config_settings)
     return defaults + [
         "cmake",
-        "metatensor-core >=0.1.11,<0.2.0",
+        "metatensor-core >=0.1.15,<0.2.0",
     ]
diff --git a/python/featomic/pyproject.toml b/python/featomic/pyproject.toml
index 54c089bc8..05a0ce538 100644
--- a/python/featomic/pyproject.toml
+++ b/python/featomic/pyproject.toml
@@ -25,7 +25,7 @@ classifiers = [
 ]
 
 dependencies = [
-    "metatensor-core >=0.1.0,<0.2.0",
+    "metatensor-core >=0.1.15,<0.2.0",
     "metatensor-operations >=0.3.0,<0.4.0",
     "wigners",
 ]