diff --git a/.github/workflows/cygwin.yml b/.github/workflows/cygwin.yml
index e62c745afea8..3b1b1851626e 100644
--- a/.github/workflows/cygwin.yml
+++ b/.github/workflows/cygwin.yml
@@ -76,8 +76,7 @@ jobs:
       - name: Run pip
         run: |
           export PATH=/usr/bin:/usr/local/bin:$(cygpath ${SYSTEMROOT})/system32
-          # jsonschema is max capped because the new version depends on rust dependencies which are... hard to get on cygwin
-          python3 -m pip --disable-pip-version-check install gcovr 'jsonschema<4.18' pefile pytest pytest-subtests pytest-xdist coverage
+          python3 -m pip --disable-pip-version-check install gcovr fastjsonschema pefile pytest pytest-subtests pytest-xdist coverage
         shell: C:\cygwin\bin\bash.exe --noprofile --norc -o igncr -eo pipefail '{0}'
 
       - uses: actions/cache/save@v3
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 6d6b43af7e42..0e5002a408c9 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -33,7 +33,7 @@ jobs:
         python-version: '3.x'
     - run: |
         python -m pip install --upgrade pip
-        python -m pip install pytest pytest-xdist pytest-subtests jsonschema coverage
+        python -m pip install pytest pytest-xdist pytest-subtests fastjsonschema coverage
     - run: brew install pkg-config ninja llvm qt@5
     - env:
         CPPFLAGS: "-I/usr/local/include"
diff --git a/.github/workflows/msys2.yml b/.github/workflows/msys2.yml
index 2bdcdd30e6f4..043f5ce2a462 100644
--- a/.github/workflows/msys2.yml
+++ b/.github/workflows/msys2.yml
@@ -80,7 +80,7 @@ jobs:
             mingw-w64-${{ matrix.MSYS2_ARCH }}-python-lxml
             mingw-w64-${{ matrix.MSYS2_ARCH }}-python-setuptools
             mingw-w64-${{ matrix.MSYS2_ARCH }}-python-pip
-            mingw-w64-${{ matrix.MSYS2_ARCH }}-python-jsonschema
+            mingw-w64-${{ matrix.MSYS2_ARCH }}-python-fastjsonschema
             mingw-w64-${{ matrix.MSYS2_ARCH }}-${{ matrix.TOOLCHAIN }}
 
       - name: Install dependencies
@@ -100,7 +100,7 @@ jobs:
       - name: Run Tests
         run: |
           if [[ "${{ matrix.MSYS2_ARCH }}" == "x86_64" ]]; then
-            # There apparently is no clean way to add to the PATH in the 
+            # There apparently is no clean way to add to the PATH in the
             # previous step?
             # See for instance https://github.com/msys2/setup-msys2/issues/171
             export PATH=$PATH:$PWD/pypy3local
diff --git a/ci/ciimage/common.sh b/ci/ciimage/common.sh
index 67d59978f5a7..0169182408d5 100644
--- a/ci/ciimage/common.sh
+++ b/ci/ciimage/common.sh
@@ -15,7 +15,7 @@ base_python_pkgs=(
   pytest-xdist
   pytest-subtests
   coverage
-  jsonschema
+  fastjsonschema
 )
 
 python_pkgs=(
diff --git a/ci/run.ps1 b/ci/run.ps1
index badb4a74eae2..05bb6b69e216 100644
--- a/ci/run.ps1
+++ b/ci/run.ps1
@@ -92,7 +92,7 @@ python --version
 
 # Needed for running unit tests in parallel.
 echo ""
-python -m pip --disable-pip-version-check install --upgrade pefile pytest-xdist pytest-subtests jsonschema coverage
+python -m pip --disable-pip-version-check install --upgrade pefile pytest-xdist pytest-subtests fastjsonschema coverage
 
 # Needed for running the Cython tests
 python -m pip --disable-pip-version-check install cython
diff --git a/unittests/internaltests.py b/unittests/internaltests.py
index 1c55b2976016..66bf4586c175 100644
--- a/unittests/internaltests.py
+++ b/unittests/internaltests.py
@@ -1012,19 +1012,30 @@ def test_dependency_factory_order(self):
     def test_validate_json(self) -> None:
         """Validate the json schema for the test cases."""
         try:
-            from jsonschema import validate, ValidationError
+            from fastjsonschema import compile, JsonSchemaValueException as JsonSchemaFailure
+            fast = True
         except ImportError:
-            if is_ci():
-                raise
-            raise unittest.SkipTest('Python jsonschema module not found.')
-
-        schema = json.loads(Path('data/test.schema.json').read_text(encoding='utf-8'))
+            try:
+                from jsonschema import validate, ValidationError as JsonSchemaFailure
+                fast = False
+            except:
+                if is_ci():
+                    raise
+                raise unittest.SkipTest('neither Python fastjsonschema nor jsonschema module not found.')
+
+        with open('data/test.schema.json', 'r', encoding='utf-8') as f:
+            data = json.loads(f.read())
+
+        if fast:
+            schema_validator = compile(data)
+        else:
+            schema_validator = lambda x: validate(x, schema=data)
 
         errors: T.List[T.Tuple[Path, Exception]] = []
         for p in Path('test cases').glob('**/test.json'):
             try:
-                validate(json.loads(p.read_text(encoding='utf-8')), schema=schema)
-            except ValidationError as e:
+                schema_validator(json.loads(p.read_text(encoding='utf-8')))
+            except JsonSchemaFailure as e:
                 errors.append((p.resolve(), e))
 
         for f, e in errors: