diff --git a/requirements.in b/requirements.in
index 1e80f8ff..118c34c5 100644
--- a/requirements.in
+++ b/requirements.in
@@ -1,6 +1,6 @@
 pip
 Django>2.2<2.3
-flattentool>=0.10.0
+flattentool>=0.14.0
 libcoveocds>=0.8.0
 libcove>=0.18.0
 libcoveweb>=0.16.0
diff --git a/requirements.txt b/requirements.txt
index 1ca8de22..8436d5c5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ django-debug-toolbar==2.2  # via -r requirements.in, libcoveweb
 django-environ==0.4.5     # via -r requirements.in, libcoveweb
 django==2.2.14            # via -r requirements.in, django-bootstrap3, django-debug-toolbar, libcove, libcoveocds, libcoveweb
 et-xmlfile==1.0.1         # via openpyxl
-flattentool==0.11.0       # via -r requirements.in, libcove
+flattentool==0.14.0       # via -r requirements.in, libcove
 idna==2.10                # via requests
 importlib-metadata==1.7.0  # via django-bootstrap3, jsonschema
 jdcal==1.4.1              # via openpyxl
diff --git a/requirements_dev.txt b/requirements_dev.txt
index 94abd7d6..e7fd3e4d 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -26,7 +26,7 @@ docopt==0.6.2             # via coveralls
 docutils==0.16            # via sphinx
 et-xmlfile==1.0.1         # via -r requirements.txt, openpyxl
 flake8==3.8.3             # via -r requirements_dev.in
-flattentool==0.11.0       # via -r requirements.txt, libcove
+flattentool==0.14.0       # via -r requirements.txt, libcove
 gitdb==4.0.5              # via gitpython
 gitpython==3.1.7          # via transifex-client
 hypothesis==3.52.3        # via -r requirements_dev.in