diff --git a/containers/v2-dockerfile-test-suite-python35 b/containers/v2-dockerfile-test-suite-python35
index 8625bb0ddcafc4d21fea5ded692889f463d96434..252885940676823be25e4f0281fdee317b2d19fc 100644
--- a/containers/v2-dockerfile-test-suite-python35
+++ b/containers/v2-dockerfile-test-suite-python35
@@ -34,7 +34,7 @@ RUN pip install --upgrade setuptools coverage-badge
 RUN pip install sphinx numpydoc nbsphinx sphinx_rtd_theme sphinx-tabs autodoc
 
 # Install dependencies and samplers
-RUN pip install corner lalsuite theano healpy
+RUN pip install corner lalsuite theano healpy cython
 RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine ultranest
 
 # Install multinest
diff --git a/containers/v2-dockerfile-test-suite-python36 b/containers/v2-dockerfile-test-suite-python36
index 9142f3b4200dd7468559d32a3a97d152eeac5f58..40e67bea44a0f2a1928daff84a8b1d0bdb380e35 100644
--- a/containers/v2-dockerfile-test-suite-python36
+++ b/containers/v2-dockerfile-test-suite-python36
@@ -34,7 +34,7 @@ RUN pip install --upgrade setuptools coverage-badge
 RUN pip install sphinx numpydoc nbsphinx sphinx_rtd_theme sphinx-tabs autodoc
 
 # Install dependencies and samplers
-RUN pip install corner lalsuite theano healpy
+RUN pip install corner lalsuite theano healpy cython
 RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine ultranest
 
 # Install multinest
diff --git a/containers/v2-dockerfile-test-suite-python37 b/containers/v2-dockerfile-test-suite-python37
index 86e00a543ef2d9ceea223711e0f7556a09c0b6af..f72a28a1eb2c35a25d84f5e539c8cdd613bf63c4 100644
--- a/containers/v2-dockerfile-test-suite-python37
+++ b/containers/v2-dockerfile-test-suite-python37
@@ -34,7 +34,7 @@ RUN pip install --upgrade setuptools coverage-badge
 RUN pip install sphinx numpydoc nbsphinx sphinx_rtd_theme sphinx-tabs autodoc
 
 # Install dependencies and samplers
-RUN pip install corner lalsuite theano healpy
+RUN pip install corner lalsuite theano healpy cython
 RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine ultranest
 
 # Install multinest
diff --git a/containers/v2-dockerfile-test-suite-python38 b/containers/v2-dockerfile-test-suite-python38
index 3e4f50db28b90a70568582f1f6138dccea5e492b..8403053e2f0d4ea2414a9c6c0e33d876cc8a03b3 100644
--- a/containers/v2-dockerfile-test-suite-python38
+++ b/containers/v2-dockerfile-test-suite-python38
@@ -34,7 +34,7 @@ RUN pip install --upgrade setuptools coverage-badge
 RUN pip install sphinx numpydoc nbsphinx sphinx_rtd_theme sphinx-tabs autodoc
 
 # Install dependencies and samplers
-RUN pip install corner lalsuite theano healpy
+RUN pip install corner lalsuite theano healpy cython
 RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine ultranest
 
 # Install multinest