diff --git a/pyproject.toml b/pyproject.toml
index 06de95e4..c8dba635 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -81,7 +81,7 @@ testing-basic = [
     "freezegun>=1.1.0",
     "pytest-asyncio==0.23.6",
     "certomancer==0.12.*",
-    "pytest-cov>=4.0,<4.2",
+    "pytest-cov>=4.0,<5.1",
     "backports.zoneinfo[tzdata];python_version<\"3.9\"",
 ]
 testing = [
@@ -95,7 +95,7 @@ live-test = [
     "pytest-aiohttp~=1.0.4",
     "certomancer-csc-dummy==0.3.0",
     "certomancer[web-api]==0.12.*",
-    "pytest-cov>=4.0,<4.2",
+    "pytest-cov>=4.0,<5.1",
 ]
 mypy = [
     "pyHanko[pkcs11,xmp,opentype,image-support,async-http,extra-pubkey-algs,etsi]",