Unmet dependency in requirements.renderer.txt

[hickey]

While building with the requirements.renderer.txt dependencies:

103.1 Collecting misaka==2.1.1
103.3   Downloading misaka-2.1.1.tar.gz (125 kB)
113.1 Collecting houdini.py==0.1.0
113.1   Downloading houdini.py-0.1.0.tar.gz (15 kB)
113.7 ERROR: Could not find a version that satisfies the requirement Pygments==2.7.4 (from -r requirements.renderer.txt (line 3)) (from versions: 0.5, 0.5.1, 0.6, 0.7, 0.7.1, 0.8, 0.8.1, 0.9, 0.10, 0.11, 0.11.1, 1.0, 1.1, 1.1.1, 1.2, 1.2.1, 1.2.2, 1.3, 1.3.1, 1.4, 1.5, 1.6rc1, 1.6, 2.0rc1, 2.0, 2.0.1, 2.0.2, 2.1, 2.1.1, 2.1.2, 2.1.3, 2.2.0, 2.3.0, 2.3.1, 2.4.0, 2.4.1, 2.4.2, 2.5.1, 2.5.2)
113.7 ERROR: No matching distribution found for Pygments==2.7.4 (from -r requirements.renderer.txt (line 3))