diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 22c1fe8b..6018cfe7 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -20,7 +20,7 @@ repos:
     exclude: ^.github/dependabot.yml$
 
 - repo: https://github.com/ambv/black
-  rev: 23.12.0
+  rev: 23.12.1
   hooks:
   - id: black
     name: Blacken
diff --git a/requirements.txt b/requirements.txt
index d466b9ba..f38aacc2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 optimade[server]~=0.25.3
 aiida-core~=2.4.0
-pymatgen>=2019.7.2,!=2019.9.7,<2023.11.13
+pymatgen>=2019.7.2,!=2019.9.7,<2023.12.19
 
 # Dependencies used directly in this package, but included through other dependencies:
 # aiida-core:
diff --git a/requirements_testing.txt b/requirements_testing.txt
index 0c910204..ee1efb8d 100644
--- a/requirements_testing.txt
+++ b/requirements_testing.txt
@@ -1,4 +1,4 @@
-httpx~=0.25.2
+httpx~=0.26.0
 pgtest~=1.3
 pytest~=7.4
 pytest-cov~=4.1