diff --git a/constraints.txt b/constraints.txt
index 3a9cfffd5e..a93cf137e6 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -2,7 +2,7 @@
 anyio==4.9.0
 Babel==2.12.1
 backports.ssl-match-hostname==3.7.0.1
-bcrypt==4.3.0
+bcrypt==5.0.0
 beautifulsoup4==4.13.4
 certifi==2025.6.15
 chardet==5.2.0
diff --git a/pyproject.toml b/pyproject.toml
index a4f4c8a5c8..ca665bfdf7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ dependencies = [
     "werkzeug<1.0",           # https://github.com/pallets/werkzeug/blob/master/CHANGES
     "backports.ssl-match-hostname==3.7.0.1", # required by tornado<5.0
     "patool>=1.12,<4.1",      # https://github.com/wummel/patool/blob/master/doc/changelog.txt
-    "bcrypt>=3.1,<4.4",       # https://github.com/pyca/bcrypt/
+    "bcrypt>=3.1,<5.1",       # https://github.com/pyca/bcrypt/
     "chardet>=3.0,<5.3",      # https://pypi.python.org/pypi/chardet
     "babel==2.12.1",          # http://babel.pocoo.org/en/latest/changelog.html
     "pyxdg>=0.26,<0.29",      # https://freedesktop.org/wiki/Software/pyxdg/