diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 346710958..0ff1e2b72 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,10 +13,14 @@ jobs:
         include:
           - os: ubuntu-22.04
             python-version: "3.11"
+          - os: ubuntu-22.04
+            python-version: "3.12"
           - os: macos-11.0
             python-version: "3.10"
           - os: macos-11.0
             python-version: "3.11"
+          - os: macos-11.0
+            python-version: "3.12"
     steps:
       - name: Check out repository
         uses: actions/checkout@v2
@@ -38,8 +42,10 @@ jobs:
           poetry export -f requirements.txt --without-hashes --with dev -o requirements.txt \
           && pip install -r requirements.txt
 
+      # disable building docs (included in checks) under Python 3.12, sphinx dependencies do not work
       - name: Check code
         run: scripts/check
+        if: ${{ matrix.python-version != 3.12 }}
 
       - name: Build and Install wheel
         run: |
diff --git a/docs-requirements.txt b/docs-requirements.txt
index bef1fe2d7..c535b8afd 100644
--- a/docs-requirements.txt
+++ b/docs-requirements.txt
@@ -15,5 +15,5 @@ jsonschema>=4.10.0,<4.18.0  # newer versions break sphinxcontrib-openapi
 sphinxcontrib-redoc~=1.6
 
 # required for building OpenAPI spec
-apispec[yaml,validation]~=4.0
+apispec[yaml,validation]~=6.0
 marshmallow~=3.10  # needed for apidocs
diff --git a/httpstan/openapi.py b/httpstan/openapi.py
index 69520cdc0..ca9a3126d 100644
--- a/httpstan/openapi.py
+++ b/httpstan/openapi.py
@@ -55,5 +55,4 @@ def openapi_spec() -> apispec.APISpec:
     spec.path(path="/v1/models/{model_id}/fits/{fit_id}", view=views.handle_get_fit)
     spec.path(path="/v1/models/{model_id}/fits/{fit_id}", view=views.handle_delete_fit)
     spec.path(path="/v1/operations/{operation_id}", view=views.handle_get_operation)
-    apispec.utils.validate_spec(spec)
     return spec