diff --git a/pkgs/development/python-modules/fontbakery/tests.nix b/pkgs/development/python-modules/fontbakery/tests.nix
index 4725b1fee3e31..d968d6ec056d5 100644
--- a/pkgs/development/python-modules/fontbakery/tests.nix
+++ b/pkgs/development/python-modules/fontbakery/tests.nix
@@ -10,13 +10,10 @@ runCommand "${pname}-tests" { meta.timeout = 5; } ''
   # Check the version matches what we packaged.
   ${fontbakery}/bin/fontbakery --version | grep -q "${version}"
 
-  # Can it list its own subcommands?
-  ${fontbakery}/bin/fontbakery --list-subcommands >>$out
-
   # Unpack src to get some test fonts.
   tar -xzf ${src} --strip-components=1 ${pname}-${version}/data/test
 
   # Run some font checks.
-  ${fontbakery}/bin/fontbakery check-ufo-sources --no-progress --no-colors data/test/test.ufo >>$out
+  ${fontbakery}/bin/fontbakery check-ufo --no-progress --no-colors data/test/test.ufo >>$out
   # TODO add more
 ''
diff --git a/pkgs/development/python-modules/fonttools/default.nix b/pkgs/development/python-modules/fonttools/default.nix
index be573a627e99e..57e8372efa768 100644
--- a/pkgs/development/python-modules/fonttools/default.nix
+++ b/pkgs/development/python-modules/fonttools/default.nix
@@ -26,7 +26,7 @@
 
 buildPythonPackage rec {
   pname = "fonttools";
-  version = "4.49.0";
+  version = "4.51.0";
   pyproject = true;
 
   disabled = pythonOlder "3.8";
@@ -35,7 +35,7 @@ buildPythonPackage rec {
     owner  = pname;
     repo   = pname;
     rev = "refs/tags/${version}";
-    hash = "sha256-8xQVuAnIS/mwYKwI+ow0YArIP8wFTKWGLZ+NCgIFYok=";
+    hash = "sha256-JUAFGLjyq/2OXlhTB6dIcO3Mq7Rx1HII+sg2TaQfPYU=";
   };
 
   build-system = [
diff --git a/pkgs/development/python-modules/glyphsets/default.nix b/pkgs/development/python-modules/glyphsets/default.nix
index 5decc00464a32..8d523b5929aa0 100644
--- a/pkgs/development/python-modules/glyphsets/default.nix
+++ b/pkgs/development/python-modules/glyphsets/default.nix
@@ -6,6 +6,7 @@
 , gflanguages
 , glyphslib
 , pytestCheckHook
+, pyyaml
 , requests
 , setuptools
 , setuptools-scm
@@ -27,6 +28,7 @@ buildPythonPackage rec {
     fonttools
     gflanguages
     glyphslib
+    pyyaml
     requests
     setuptools
     unicodedata2
diff --git a/pkgs/development/python-modules/ufo2ft/default.nix b/pkgs/development/python-modules/ufo2ft/default.nix
index 4da116d007815..4907d2ecc6eb3 100644
--- a/pkgs/development/python-modules/ufo2ft/default.nix
+++ b/pkgs/development/python-modules/ufo2ft/default.nix
@@ -6,6 +6,7 @@
 , cu2qu
 , defcon
 , fetchPypi
+, fontmath
 , fonttools
 , pytestCheckHook
 , pythonOlder
@@ -38,6 +39,7 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [
     cu2qu
+    fontmath
     fonttools
     defcon
     compreffor