diff --git a/pyinstaller.spec b/pyinstaller.spec
index eece50757..01b1ac4ac 100644
--- a/pyinstaller.spec
+++ b/pyinstaller.spec
@@ -36,6 +36,7 @@ hidden_imports = [
     'allmydata.stats',
     'base64',
     'cffi',
+    'charset_normalizer.md__mypyc',
     'collections',
     'commands',
     'Crypto',
diff --git a/setup.py b/setup.py
index f867e901d..1974145cb 100644
--- a/setup.py
+++ b/setup.py
@@ -147,13 +147,6 @@ install_requires = [
     # for pid-file support
     "psutil",
     "filelock",
-
-    # treq needs requests, requests needs charset_normalizer,
-    # charset_normalizer breaks PyInstaller
-    # (https://github.com/Ousret/charset_normalizer/issues/253). So work around
-    # this by using a lower version number. Once upstream issue is fixed, or
-    # requests drops charset_normalizer, this can go away.
-    "charset_normalizer < 3",
 ]
 
 setup_requires = [