diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7ef422f..c7b3581 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -71,7 +71,7 @@ SET(CPACK_PACKAGE_VENDOR "Guilhem Lavaux")
 SET(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/LICENCE_CeCILL_V2")
 SET(CPACK_PACKAGE_VERSION_MAJOR "1")
 SET(CPACK_PACKAGE_VERSION_MINOR "2")
-SET(CPACK_PACKAGE_VERSION_PATCH "2${EXTRA_VERSION}")
+SET(CPACK_PACKAGE_VERSION_PATCH "3${EXTRA_VERSION}")
 SET(CPACK_PACKAGE_INSTALL_DIRECTORY "CosmoToolbox-${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}")
 SET(CPACK_STRIP_FILES "lib/libCosmoTool.so")
 SET(CPACK_SOURCE_IGNORE_FILES 
diff --git a/conda/conda_build_config.yaml b/conda/conda_build_config.yaml
index 288df1f..1f026b6 100644
--- a/conda/conda_build_config.yaml
+++ b/conda/conda_build_config.yaml
@@ -1,8 +1,10 @@
 python:
-  - 3.7
-  - 3.8
   - 3.9
+  - 3.8
+  - 3.7
 
 numpy:
-  - 1.11
   - 1.19
+
+gsl:
+  - 2.4
diff --git a/conda/meta.yaml b/conda/meta.yaml
index 249bebd..a91f788 100644
--- a/conda/meta.yaml
+++ b/conda/meta.yaml
@@ -1,6 +1,6 @@
 package:
   name: cosmotool
-  version: "1.2.2"
+  version: "1.2.3"
 
 source:
   git_rev: 03033b6
@@ -8,41 +8,40 @@ source:
 
 requirements:
   build:
-    - numpy >=1.11
+    - python                                 # [build_platform != target_platform]
+    - cross-python_{{ target_platform }}     # [build_platform != target_platform]
+    - cython                                 # [build_platform != target_platform]
+    - numpy                                  # [build_platform != target_platform]
     - {{ compiler('c') }}
     - {{ compiler('cxx') }}
-    - python
-    - setuptools
-    - cython
-    - healpy
-    - numexpr
-    - cffi
-    - pyfftw
-    - gsl
-    - h5py
 
   host:
     - python
+    - pip
+    - numpy
+    - pkgconfig
     - numexpr
     - cython
     - healpy
     - cffi
     - pyfftw
-    - gsl
+    - gsl {{ gsl }}
     - h5py
-
   run:
-    - numpy
     - python
+    - {{ pin_compatible('numpy') }}
     - healpy
     - numexpr
     - cffi
     - pyfftw
     - h5py
+    - {{ pin_compatible('gsl') }}
 
 test:
   imports:
     - cosmotool
+  requires:
+    - pip
 
 about:
   home: https://bitbucket.org/glavaux/cosmotool
diff --git a/requirements.txt b/requirements.txt
index ef3f5d4..3a4577b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-numpy
+numpy<1.19
 cffi
 numexpr
 pyfftw
diff --git a/setup.py b/setup.py
index b8c6925..22e07e8 100644
--- a/setup.py
+++ b/setup.py
@@ -223,7 +223,7 @@ class BuildCMakeExt(build_ext):
 CosmoTool_extension = CMakeExtension(name="cosmotool")
 
 setup(name='cosmotool',
-      version='1.2.2',
+      version='1.2.3',
       packages=["cosmotool"],
       package_dir={'cosmotool': 'python/cosmotool'},
       install_requires=['numpy','cffi','numexpr','pyfftw','h5py'],
diff --git a/src/hdf5_array.hpp b/src/hdf5_array.hpp
index 9587189..db75a33 100644
--- a/src/hdf5_array.hpp
+++ b/src/hdf5_array.hpp
@@ -426,7 +426,7 @@ namespace CosmoTool {
 #define CTOOL_HDF5_INSERT_ELEMENT(r, STRUCT, element) \
      { \
        ::CosmoTool::get_hdf5_data_type<BOOST_PP_TUPLE_ELEM(2, 0, element)> t; \
-       position = HOFFSET(STRUCT, BOOST_PP_TUPLE_ELEM(2, 1, element)); \
+       long position = HOFFSET(STRUCT, BOOST_PP_TUPLE_ELEM(2, 1, element)); \
        const char *field_name = BOOST_PP_STRINGIZE(BOOST_PP_TUPLE_ELEM(2, 1, element)); \
        type.insertMember(field_name,  position, t.type()); \
      } 
@@ -439,7 +439,6 @@ namespace CosmoTool { \
   \
       TNAME() : type(sizeof(STRUCT)) \
       {  \
-        long position; \
         BOOST_PP_SEQ_FOR_EACH(CTOOL_HDF5_INSERT_ELEMENT, STRUCT, ATTRIBUTES) \
       }  \
       \
@@ -471,7 +470,6 @@ namespace CosmoTool { \
   \
       TNAME() : type(sizeof(STRUCT)) \
       {  \
-        long position; \
         BOOST_PP_SEQ_FOR_EACH(CTOOL_HDF5_INSERT_ENUM_ELEMENT, STRUCT, ATTRIBUTES) \
       }  \
       \