diff --git a/mypy-requirements.txt b/mypy-requirements.txt
index e790f949..0c96e861 100644
--- a/mypy-requirements.txt
+++ b/mypy-requirements.txt
@@ -1,5 +1,5 @@
 mypy[mypyc]==1.18.2  # update pyproject.toml as well
-black>=23.12,<25.10
+black>=23.12,<25.12
 types-requests
 types-dataclasses
 objgraph
diff --git a/pyproject.toml b/pyproject.toml
index 210853ff..e7529bec 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ requires = [
     "setuptools>=50",  # 50 is to match mypyc's minimum
     "setuptools_scm[toml]>=8.0.4,<10",
     'mypy[mypyc]==1.18.2',  # update mypy-requirements as well
-    "black>=19.10b0,<25.10",
+    "black>=19.10b0,<25.12",
     "types-requests",
     "types-dataclasses",
     "ruamel.yaml>=0.17.6, < 0.19",
diff --git a/requirements.txt b/requirements.txt
index d534c10c..4215d5d8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,5 +3,5 @@ ruamel.yaml >= 0.17.6, < 0.19
 rdflib>= 4.2.2, < 8.0.0
 mistune>=3,<3.2
 CacheControl[filecache]>= 0.13.1, < 0.15
-black>=19.10b0,<25.10
+black>=19.10b0,<25.12
 mypy_extensions