diff --git a/Dockerfile b/Dockerfile
index 0b57f92..a64e552 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -30,6 +30,7 @@ WORKDIR /app
 ADD . /app
 
 RUN apt-get update \
-  && apt-get install gcc g++ zlib1g-dev -y \
+  && apt-get install gcc g++ make procps libbz2-dev liblzma-dev libcurl4-openssl-dev libncurses5-dev zlib1g-dev locales locales-all -y --no-install-recommends \
+  && pip install cython==0.29.36 \
   && pip install -r requirements.txt \
   && pip install .
diff --git a/biometrics/cluster.py b/biometrics/cluster.py
index 8dae9db..616022e 100644
--- a/biometrics/cluster.py
+++ b/biometrics/cluster.py
@@ -44,7 +44,10 @@ def cluster(self, comparisons):
             max_occurence = occurences.most_common()
             max_occurence_val = max_occurence[0][1]
             most_common_group = list(filter(lambda x: x[1] == max_occurence_val, max_occurence))
-            most_common_group = ':'.join([i[0] for i in most_common_group])
+            most_common_group = ':'.join(
+                str(k) if not isinstance(k, (tuple, list)) else ':'.join(map(str, k))
+                for k, _ in most_common_group
+            )
 
             for i, sample in enumerate(samples_in_group):
 
diff --git a/setup.cfg b/setup.cfg
index 74cb692..7a4d178 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.2.16
+current_version = 0.2.17
 commit = True
 tag = True