diff --git a/Dockerfile b/Dockerfile
index a2687a12..c8d40cca 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -106,6 +106,7 @@ COPY toCOPY/populate_downloads.sh /usr/local/bin
 COPY toCOPY/generate-cgcs-tis-repo /usr/local/bin
 COPY toCOPY/generate-cgcs-centos-repo.sh /usr/local/bin
 COPY toCOPY/.inputrc /home/$MYUNAME/
+COPY toCOPY/builder-constraints.txt /home/$MYUNAME/
 
 # cpan modules, installing with cpanminus to avoid stupid questions since cpan is whack
 RUN cpanm --notest Fatal && \
@@ -115,8 +116,8 @@ RUN cpanm --notest Fatal && \
     cpanm --notest XML::Simple
 
 # pip installs
-RUN pip install python-subunit junitxml --upgrade && \
-    pip install tox --upgrade
+RUN pip install -c /home/$MYUNAME/builder-constraints.txt python-subunit junitxml --upgrade && \
+    pip install -c /home/$MYUNAME/builder-constraints.txt tox --upgrade
 
 # Install repo tool
 RUN curl https://storage.googleapis.com/git-repo-downloads/repo > /usr/local/bin/repo && \
diff --git a/toCOPY/builder-constraints.txt b/toCOPY/builder-constraints.txt
new file mode 100644
index 00000000..04c829e9
--- /dev/null
+++ b/toCOPY/builder-constraints.txt
@@ -0,0 +1,2 @@
+more-itertools===5.0.0;python_version=='2.7' # Last version with official 2.7 support
+