diff --git a/hscommon/sphinxgen.py b/hscommon/sphinxgen.py
index 684de19a..a3165097 100644
--- a/hscommon/sphinxgen.py
+++ b/hscommon/sphinxgen.py
@@ -7,10 +7,8 @@
 import os.path as op
 import re
 
-from distutils.version import LooseVersion
-from pkg_resources import load_entry_point, get_distribution
-
 from .build import read_changelog_file, filereplace
+from sphinx.cmd.build import build_main as sphinx_build
 
 CHANGELOG_FORMAT = """
 {version} ({date})
@@ -73,26 +71,10 @@ def gen(
     if op.exists(confpath):
         conf_out = op.join(basepath, "conf.py")
         filereplace(confpath, conf_out, **confrepl)
-    if LooseVersion(get_distribution("sphinx").version) >= LooseVersion("1.7.0"):
-        from sphinx.cmd.build import build_main as sphinx_build
-
-        # Call the sphinx_build function, which is the same as doing sphinx-build from cli
-        try:
-            sphinx_build([basepath, destpath])
-        except SystemExit:
-            print(
-                "Sphinx called sys.exit(), but we're cancelling it because we don't actually want to exit"
-            )
-    else:
-        # We used to call sphinx-build with print_and_do(), but the problem was that the virtualenv
-        # of the calling python wasn't correctly considered and caused problems with documentation
-        # relying on autodoc (which tries to import the module to auto-document, but fail because of
-        # missing dependencies which are in the virtualenv). Here, we do exactly what is done when
-        # calling the command from bash.
-        cmd = load_entry_point("Sphinx", "console_scripts", "sphinx-build")
-        try:
-            cmd(["sphinx-build", basepath, destpath])
-        except SystemExit:
-            print(
-                "Sphinx called sys.exit(), but we're cancelling it because we don't actually want to exit"
-            )
+    # Call the sphinx_build function, which is the same as doing sphinx-build from cli
+    try:
+        sphinx_build([basepath, destpath])
+    except SystemExit:
+        print(
+            "Sphinx called sys.exit(), but we're cancelling it because we don't actually want to exit"
+        )
diff --git a/requirements-extra.txt b/requirements-extra.txt
index 85a0240e..abcf03b8 100644
--- a/requirements-extra.txt
+++ b/requirements-extra.txt
@@ -1,5 +1,5 @@
-pytest>=5,<6
+pytest>=6,<7
 flake8
 tox-travis
 black
-pyinstaller>=4.0,<5.0; sys_platform != 'linux'
\ No newline at end of file
+pyinstaller>=4.5,<5.0; sys_platform != 'linux'
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 0d1b8c10..a46d3e5f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 Send2Trash>=1.3.0
-sphinx>=1.2.2
-polib>=1.0.4
+sphinx>=3.0.0
+polib>=1.1.0
 hsaudiotag3k>=1.1.3*
 distro>=1.5.0
-PyQt5 >=5.4,<6.0; sys_platform != 'linux'
-pywin32>=200; sys_platform == 'win32'
\ No newline at end of file
+PyQt5 >=5.14.1,<6.0; sys_platform != 'linux'
+pywin32>=228; sys_platform == 'win32'
\ No newline at end of file