Relaxed package dependencies.

Makefile

@@ -36,6 +36,7 @@ uninstall:
 install-dev:
 	pipenv install --dev
 	pipenv run pre-commit install
+	pipenv graph
 
 uninstall-dev:
 	pipenv --rm

Pipfile

@@ -26,21 +26,21 @@ verify_ssl = true
 
 [dev-packages]
 # Documentation.
-Sphinx = "~=4.2"
-sphinx-rtd-theme = '~=1.0'
+Sphinx = ">=4,<5"
+sphinx-rtd-theme = ">=1,<2"
 
 # Tools.
-twine = "~=3.4"
-pre-commit = "~=2.15"
+twine = ">=3,<4"
+pre-commit = ">=2,<3"
 
 [packages]
-requests = "~=2.26"
+appdirs = ">=1.4,<1.5"
+atomicwrites = ">=1.4,<1.5"
+filetype = ">=1.0,<1.1"
+fpyutils = ">=2,<3"
 lxml = ">=4.6.3,<4.7"
-atomicwrites = "~=1.4"
-filetype = "~=1.0"
-appdirs = "~=1.4"
-PyYAML = "~=5.4"
-fpyutils = "~=2.0"
+PyYAML = ">=5.4,<5.5"
+requests = ">=2.25,<3"
 
 [requires]
 python_version = "*"

setup.py

@@ -52,12 +52,12 @@ setup(
         'Programming Language :: Python :: 3',
     ],
     install_requires=[
+        'appdirs>=1.4,<1.5',
         'atomicwrites>=1.4,<1.5',
         'filetype>=1.0,<1.1',
-        'appdirs>=1.4,<1.5',
-        'requests>=2.26,<2.27',
+        'fpyutils>=2,<3'
         'lxml>=4.6.3,<4.7',
         'PyYAML>=5.4,<5.5',
-        'fpyutils>=2.0,<2.1'
+        'requests>=2.25,<3',
     ],
 )