diff --git a/dev_requirements.txt b/dev_requirements.txt
index 43905790..e74bb3a7 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -1,10 +1,4 @@
 check-manifest >= 0.35
 twine >= 1.8.1
 coverage >= 4.4
-pytest-xdist >= 1.16.0
 GitPython == 2.1.3
-
-# Known good versions: 1.11.1
-# Known broken versions: 1.15.0
-setuptools-scm == 1.11.1
-setuptools-scm-git-archive == 1.0
diff --git a/requirements.txt b/requirements.txt
index b1bd2389..c39fc2a3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,5 +6,5 @@ Pillow == 5.0.0
 reportlab == 3.4.0
 PyPDF2 == 1.26.0
 img2pdf == 0.2.4
-cffi == 1.11.2
+cffi == 1.11.5
 PyMuPDF == 1.12.4