diff --git a/.circleci/config.yml b/.circleci/config.yml
index fa16804..8c3849d 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -23,7 +23,7 @@ jobs:
             pwd
             mkdir config build install
             . /opt/conda/bin/activate root
-            conda install -y cython gdal h5py libgdal pytest numpy fftw scipy scons hdf4 hdf5 libgcc libstdcxx-ng cmake astropy
+            conda install -y cython gdal h5py libgdal pytest numpy fftw scipy scons hdf4 hdf5 libgcc libstdcxx-ng cmake astropy pybind11
             yum install -y x11-devel motif-devel jq gcc-gfortran opencv opencv-devel opencv-python
 
       - run:
@@ -77,7 +77,7 @@ jobs:
             pwd
             mkdir config build install
             . /opt/conda/bin/activate root
-            conda install --yes cython gdal h5py libgdal pytest numpy fftw scipy scons hdf4 hdf5 libgcc libstdcxx-ng cmake astropy
+            conda install --yes cython gdal h5py libgdal pytest numpy fftw scipy scons hdf4 hdf5 libgcc libstdcxx-ng cmake astropy pybind11
             yum install -y uuid-devel x11-devel motif-devel jq gcc-gfortran opencv opencv-devel opencv-python
             ln -s /opt/conda/bin/cython /opt/conda/bin/cython3
             cd /opt/conda/lib