diff --git a/dev-requirements.txt b/dev-requirements.txt
index eea5f21f750413c06d9a5dc25d30fb6fa19a4f84..3af84aa9a22afa2246f936d6bf1e3b2d67512424 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -4,11 +4,9 @@ invocations>=1.2.0,<2.0
 # NOTE: pytest-relaxed currently only works with pytest >=3, <3.3
 pytest>=3.2,<3.3
 pytest-relaxed==1.1.4
-# pytest-xdist for test dir watching and the inv guard task
-pytest-xdist>=1.22,<1.25.0
 mock==2.0.0
 # Linting!
-flake8==3.6.0
+flake8==2.4.0
 # Coverage!
 coverage==3.7.1
 codecov==1.6.3
@@ -21,4 +19,5 @@ semantic_version>=2.4,<2.5
 wheel==0.24
 twine==1.11.0
 # Test-matrix-oriented pins of production deps; should only exist on 2.0-2.3
-pycparser==2.18
+pycparser<2.19
+idna<2.8