diff --git a/constraints.txt b/constraints.txt
index bdf71ee7..51c48a10 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -10,3 +10,4 @@ pytest-cov==3.0.0; python_version=="3.8"
 pytest-cov==7.0.0; python_version > "3.8"
 pytest-timeout==2.2.0; python_version=="3.8"
 pytest-timeout==2.4.0; python_version > "3.8"
+pyOpenSSL<26.2.0
diff --git a/setup.cfg b/setup.cfg
index 2e771f17..e3a7b880 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -64,7 +64,7 @@ test =
     gevent>=1.2 ; implementation_name!='pypy'
     eventlet>=0.17.1 ; implementation_name!='pypy'
     pyjks
-    pyopenssl
+    pyOpenSSL
 
 eventlet =
     eventlet>=0.17.1
@@ -81,6 +81,7 @@ docs =
 
 typing =
     mypy>=0.991
+    pyOpenSSL
 
 alldeps =
     %(dev)s
@@ -89,4 +90,3 @@ alldeps =
     %(sasl)s
     %(docs)s
     %(typing)s
-