diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 3588e9b4e..1bbb74334 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -33,13 +33,13 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        py: ['3.9', '3.10', '3.11']
+        py: ['3.9', '3.10', '3.11', '3.12']
     steps:
       - uses: actions/checkout@v4
         with:
           fetch-depth: '0' # Fetch all history for all tags and branches
 
-      - uses: CagtayFabry/pydeps2env@v1.2.0
+      - uses: marscher/pydeps2env@v999
         with:
           files: 'pyproject.toml'
           channels: 'conda-forge defaults'
@@ -47,14 +47,16 @@ jobs:
           build_system: 'include'
 
       - name: Setup Conda Environment
-        uses: mamba-org/setup-micromamba@v1.9.0
+        uses: mamba-org/setup-micromamba@v2
         with:
+          micromamba-version: "2.0.2-0"
           environment-file: ./environment.yml
           environment-name: weldx
           init-shell: >-
             bash
             powershell
-          cache-environment: true
+          # persist on the same day.
+          cache-environment-key: environment-${{ steps.date.outputs.date }}
           create-args: >-
             python=${{ matrix.py }}
             wheel
@@ -133,13 +135,13 @@ jobs:
       fail-fast: false
       matrix:
         os: [windows-latest]
-        py: ['3.9']
+        py: ['3.10']
     steps:
       - uses: actions/checkout@v4
         with:
           fetch-depth: '0' # Fetch all history for all tags and branches
 
-      - uses: CagtayFabry/pydeps2env@v1.2.0
+      - uses: marscher/pydeps2env@v999
         with:
           files: 'pyproject.toml'
           channels: 'conda-forge defaults'
@@ -147,14 +149,15 @@ jobs:
           build_system: 'include'
 
       - name: Setup Conda Environment
-        uses: mamba-org/setup-micromamba@v1.9.0
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ./environment.yml
           environment-name: weldx
           init-shell: >-
             bash
             powershell
-          cache-environment: true
+          # persist on the same day.
+          cache-environment-key: environment-${{ steps.date.outputs.date }}
           create-args: >-
             python=${{ matrix.py }}
             wheel
diff --git a/.github/workflows/static_analysis.yml b/.github/workflows/static_analysis.yml
index 85288e8d4..2361c97dd 100644
--- a/.github/workflows/static_analysis.yml
+++ b/.github/workflows/static_analysis.yml
@@ -55,7 +55,7 @@ jobs:
           environment-name: weldx
           cache-environment: true
           create-args: >-
-            python=3.9
+            python=3.10
             mypy
       - name: activate env
         run: micromamba activate weldx
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb0a96802..aaeee5497 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@
 
 - pin `weldx-widgets>=0.2.3` for viz \[{pull}`939`\].
 - pin `pint>=0.21` \[{pull}`941`\].
+- pin `python<3.13` \[{pull}`896`\].
 
 ## 0.6.8 (07.06.2024)
 
diff --git a/pyproject.toml b/pyproject.toml
index 4fd4335f2..1e61ed9b6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ authors = [
   { name = "Volker Hirthammer", email = "volker.hirthammer@bam.de" },
   { name = "Martin K. Scherer", email = "martin.scherer@bam.de" },
 ]
-requires-python = ">=3.9,<3.12"
+requires-python = ">=3.9,<3.13"
 classifiers = [
   "Development Status :: 4 - Beta",
   "Intended Audience :: Education",
@@ -34,6 +34,7 @@ classifiers = [
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
   "Topic :: Scientific/Engineering :: Physics",  # TODO: add more topics here!
 ]
 dynamic = [