diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d69b133f68d355040ad665cd0c6d03620d6cd9fa..a5e0eadf0ae4198986f4f1c549941f99dfd3abe6 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -172,7 +172,7 @@ python-3.10:
 .test-sampler: &test-sampler
   stage: test
   script:
-    - python -m pip install .
+    - python -m pip install .[all]
     - python -m pip list installed
     - pytest test/integration/sampler_run_test.py --durations 10 -v
 
diff --git a/sampler_requirements.txt b/sampler_requirements.txt
index 64d2c8c50bdf1d44292952d97f780423c3c6c213..d6ed8e98ebce0797864ea463672eaf04ac600fd0 100644
--- a/sampler_requirements.txt
+++ b/sampler_requirements.txt
@@ -2,6 +2,7 @@ cpnest>=0.9.4
 dynesty
 emcee
 nestle
+ptmcmcsampler!=2.1.0,!=0.0.0
 ptemcee
 pymc>=4.0.0
 pymultinest