diff --git a/pyproject.toml b/pyproject.toml
index db863941d..2724ffe94 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,7 +68,8 @@ dev = [
   "pydocstyle>=6.3.0,<7",
   "pydoctor>=25.10.1,<26",
   "pyright==1.1.414",
-  "pytest~=9.0",
+  # pytest-asyncio 0.21 relies on pytest internals removed in 9.2.
+  "pytest>=9.0,<9.2",
   "pytest-asyncio>=0.21,<0.22",
   "pytest-timeout~=2.2",
   "ruff>=0.15.12,<0.16",
diff --git a/uv.lock b/uv.lock
index e38d7687c..737fb2ed5 100644
--- a/uv.lock
+++ b/uv.lock
@@ -4651,7 +4651,7 @@ dev = [
     { name = "pydocstyle", specifier = ">=6.3.0,<7" },
     { name = "pydoctor", specifier = ">=25.10.1,<26" },
     { name = "pyright", specifier = "==1.1.414" },
-    { name = "pytest", specifier = "~=9.0" },
+    { name = "pytest", specifier = ">=9.0,<9.2" },
     { name = "pytest-asyncio", specifier = ">=0.21,<0.22" },
     { name = "pytest-cov", specifier = ">=6.1.1" },
     { name = "pytest-flakefinder", specifier = ">=1.1.0" },