diff --git a/containers/Dockerfile-test-suite-python27 b/containers/Dockerfile-test-suite-python27
index 937d95f570c990c0f0c281dafe07eb018180b170..4d8c1ba9f646d04135dbedd2deaf9f8f29b39d4c 100644
--- a/containers/Dockerfile-test-suite-python27
+++ b/containers/Dockerfile-test-suite-python27
@@ -41,7 +41,7 @@ coverage-badge
 RUN pip install corner lalsuite astropy gwpy theano
 
 # Install samplers
-RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine
+RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine ultranest
 
 # Install pymultinest requirements
 RUN apt-get install -y libblas3 libblas-dev liblapack3 liblapack-dev \
diff --git a/containers/Dockerfile-test-suite-python37 b/containers/Dockerfile-test-suite-python37
index be0eeb095489aca4bdfb01656e18e9c10d8e746b..efbacc22951b6d2af0f31927ee0c8512f77e6f6f 100644
--- a/containers/Dockerfile-test-suite-python37
+++ b/containers/Dockerfile-test-suite-python37
@@ -48,7 +48,7 @@ RUN pip install sphinx numpydoc nbsphinx sphinx_rtd_theme sphinx-tabs
 RUN pip install corner lalsuite astropy gwpy theano healpy
 
 # Install samplers
-RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine
+RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine ultranest
 
 # Install pymultinest requirements
 RUN apt-get install -y libblas3 libblas-dev liblapack3 liblapack-dev \
diff --git a/containers/v2-dockerfile-test-suite-python35 b/containers/v2-dockerfile-test-suite-python35
index 01b23d9845734dcbc4e581686cee671c255cf757..428220f65678d9af470b913cd606bc1cd5d2dfd5 100644
--- a/containers/v2-dockerfile-test-suite-python35
+++ b/containers/v2-dockerfile-test-suite-python35
@@ -35,7 +35,7 @@ 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 cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine
+RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine ultranest
 
 # Install multinest
 RUN git clone https://github.com/farhanferoz/MultiNest.git \
diff --git a/containers/v2-dockerfile-test-suite-python36 b/containers/v2-dockerfile-test-suite-python36
index 44de13bd9f2b1db74766972cdb547a0aaf24e9b3..c81a3c1bdce018694f13939c48c2245b838453f2 100644
--- a/containers/v2-dockerfile-test-suite-python36
+++ b/containers/v2-dockerfile-test-suite-python36
@@ -35,7 +35,7 @@ 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 cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine
+RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine ultranest
 
 # Install multinest
 RUN git clone https://github.com/farhanferoz/MultiNest.git \
diff --git a/containers/v2-dockerfile-test-suite-python37 b/containers/v2-dockerfile-test-suite-python37
index cc6725107ef285703b57485902cefbe3dc0114bc..019d00cc5e92103fae98165016b5f961d186a97e 100644
--- a/containers/v2-dockerfile-test-suite-python37
+++ b/containers/v2-dockerfile-test-suite-python37
@@ -35,7 +35,7 @@ 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 cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine
+RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine ultranest
 
 # Install multinest
 RUN git clone https://github.com/farhanferoz/MultiNest.git \
diff --git a/containers/v2-dockerfile-test-suite-python38 b/containers/v2-dockerfile-test-suite-python38
index 23c6b6d12bec378fb621ea3d1df5ed778c37b582..4f06b917647d24c273e0db05b8c0d08308666dc0 100644
--- a/containers/v2-dockerfile-test-suite-python38
+++ b/containers/v2-dockerfile-test-suite-python38
@@ -35,7 +35,7 @@ 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 cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine
+RUN pip install cpnest dynesty emcee nestle ptemcee pymc3 pymultinest kombine ultranest
 
 # Install multinest
 RUN git clone https://github.com/farhanferoz/MultiNest.git \