diff --git a/doc/changes/unreleased.md b/doc/changes/unreleased.md
index 79e701b..e105f6a 100644
--- a/doc/changes/unreleased.md
+++ b/doc/changes/unreleased.md
@@ -1 +1,5 @@
 # Unreleased
+
+## ✨ Added
+
+#233: Added nox task to verify dependency-declarations
diff --git a/exasol/toolbox/nox/_dependencies_check.py b/exasol/toolbox/nox/_dependencies_check.py
new file mode 100644
index 0000000..d508576
--- /dev/null
+++ b/exasol/toolbox/nox/_dependencies_check.py
@@ -0,0 +1,81 @@
+import tomlkit
+import sys
+from pathlib import Path
+import nox
+from nox import Session
+from noxconfig import PROJECT_CONFIG
+from typing import (
+    List,
+    Dict
+)
+import rich.console
+
+
+@nox.session(name="dependencies-check", python=False)
+def dependency_check(session: Session) -> None:
+    content = Path(PROJECT_CONFIG.root, "pyproject.toml").read_text()
+    dependencies = Dependencies(content).parse()
+    console = rich.console.Console()
+    if illegal := dependencies.illegal:
+        report_illegal(illegal, console)
+        sys.exit(1)
+
+
+class Dependencies:
+    ILLEGAL_DEPENDENCIES = ['url', 'git', 'path']
+
+    def __init__(self, pyproject_toml: str):
+        self.illegal_dict: Dict[str, List[str]] = {}
+        self.content = pyproject_toml
+
+    def parse(self) -> "Dependencies":
+        def source_filter(version) -> bool:
+            for f in self.ILLEGAL_DEPENDENCIES:
+                if f in version:
+                    return True
+            return False
+
+        def extract_dependencies(section) -> List[str]:
+            dependencies = []
+            for name, version in section.items():
+                if source_filter(version):
+                    dependencies.append(f"{name} = {version}")
+            return dependencies
+
+        illegal: Dict[str, List[str]] = {}
+        toml = tomlkit.loads(self.content)
+        poetry = toml.get("tool", {}).get("poetry", {})
+
+        part = poetry.get("dependencies", {})
+        dependencies_list = extract_dependencies(part)
+        if dependencies_list:
+            illegal["tool.poetry.dependencies"] = dependencies_list
+
+        part = poetry.get("dev", {}).get("dependencies", {})
+        dependencies_list = extract_dependencies(part)
+        if dependencies_list:
+            illegal["tool.poetry.dev.dependencies"] = dependencies_list
+
+        part = poetry.get("group", {})
+        for group, content in part.items():
+            dependencies_list = extract_dependencies(content.get("dependencies", {}))
+            if dependencies_list:
+                illegal[f"tool.poetry.group.{group}.dependencies"] = dependencies_list
+
+        self.illegal_dict = illegal
+        return self
+
+    @property
+    def illegal(self) -> Dict[str, List[str]]:
+        return self.illegal_dict
+
+
+def report_illegal(illegal: Dict[str, List[str]], console: rich.console.Console):
+    count = sum(len(deps) for deps in illegal.values())
+    suffix = "y" if count == 1 else "ies"
+    console.print(f"{count} illegal dependenc{suffix}\n", style="red")
+    for section, dependencies in illegal.items():
+        console.print(f"\\[{section}]", style="red")
+        for dependency in dependencies:
+            console.print(dependency, style="red")
+        console.print("")
diff --git a/exasol/toolbox/nox/tasks.py b/exasol/toolbox/nox/tasks.py
index d9cb27d..9161a2c 100644
--- a/exasol/toolbox/nox/tasks.py
+++ b/exasol/toolbox/nox/tasks.py
@@ -51,6 +51,9 @@
     integration_tests,
     unit_tests,
 )
+from exasol.toolbox.nox._dependencies_check import (
+    dependency_check
+)
 from noxconfig import PROJECT_CONFIG
 
 
diff --git a/test/unit/dependencies_check_test.py b/test/unit/dependencies_check_test.py
new file mode 100644
index 0000000..db76c19
--- /dev/null
+++ b/test/unit/dependencies_check_test.py
@@ -0,0 +1,147 @@
+import pytest
+import rich.console
+
+from exasol.toolbox.nox._dependencies_check import Dependencies, report_illegal
+
+
+@pytest.mark.parametrize(
+    "toml,expected",
+    [
+        (
+            """
+            """,
+            {}
+        ),
+        (
+            """
+[tool.poetry.dependencies]
+python = "^3.8"
+example-url1 = {url = "https://example.com/my-package-0.1.0.tar.gz"}
+
+[tool.poetry.dev.dependencies]
+nox = ">=2022.8.7"
+example-url2 = {url = "https://example.com/my-package-0.2.0.tar.gz"}
+
+[tool.poetry.group.test.dependencies]
+sphinx = ">=5.3,<8"
+example-git = {git = "git@github.com:requests/requests.git"}
+
+[tool.poetry.group.dev.dependencies]
+pytest = ">=7.2.2,<9"
+example-path1 = {path = "../my-package/dist/my-package-0.1.0.tar.gz"}
+            """,
+            {
+                "tool.poetry.dependencies": ["example-url1 = {'url': 'https://example.com/my-package-0.1.0.tar.gz'}"],
+                "tool.poetry.dev.dependencies": ["example-url2 = {'url': 'https://example.com/my-package-0.2.0.tar.gz'}"],
+                "tool.poetry.group.test.dependencies": ["example-git = {'git': 'git@github.com:requests/requests.git'}"],
+                "tool.poetry.group.dev.dependencies": ["example-path1 = {'path': '../my-package/dist/my-package-0.1.0.tar.gz'}"],
+            }
+        ),
+        (
+            """
+[tool.poetry.dev.dependencies]
+nox = ">=2022.8.7"
+example-url2 = {url = "https://example.com/my-package-0.2.0.tar.gz"}
+
+[tool.poetry.group.test.dependencies]
+sphinx = ">=5.3,<8"
+example-git = {git = "git@github.com:requests/requests.git"}
+
+[tool.poetry.group.dev.dependencies]
+pytest = ">=7.2.2,<9"
+example-path1 = {path = "../my-package/dist/my-package-0.1.0.tar.gz"}
+            """,
+            {
+                "tool.poetry.dev.dependencies": ["example-url2 = {'url': 'https://example.com/my-package-0.2.0.tar.gz'}"],
+                "tool.poetry.group.test.dependencies": ["example-git = {'git': 'git@github.com:requests/requests.git'}"],
+                "tool.poetry.group.dev.dependencies": ["example-path1 = {'path': '../my-package/dist/my-package-0.1.0.tar.gz'}"],
+            }
+        ),
+        (
+            """
+[tool.poetry.dependencies]
+python = "^3.8"
+example-url1 = {url = "https://example.com/my-package-0.1.0.tar.gz"}
+
+[tool.poetry.group.test.dependencies]
+sphinx = ">=5.3,<8"
+example-git = {git = "git@github.com:requests/requests.git"}
+
+[tool.poetry.group.dev.dependencies]
+pytest = ">=7.2.2,<9"
+example-path1 = {path = "../my-package/dist/my-package-0.1.0.tar.gz"}
+            """,
+            {
+                "tool.poetry.dependencies": ["example-url1 = {'url': 'https://example.com/my-package-0.1.0.tar.gz'}"],
+                "tool.poetry.group.test.dependencies": ["example-git = {'git': 'git@github.com:requests/requests.git'}"],
+                "tool.poetry.group.dev.dependencies": ["example-path1 = {'path': '../my-package/dist/my-package-0.1.0.tar.gz'}"],
+            }
+        ),
+        (
+            """
+[tool.poetry.dependencies]
+python = "^3.8"
+example-url1 = {url = "https://example.com/my-package-0.1.0.tar.gz"}
+
+[tool.poetry.dev.dependencies]
+nox = ">=2022.8.7"
+example-url2 = {url = "https://example.com/my-package-0.2.0.tar.gz"}
+            """,
+            {
+                "tool.poetry.dependencies": ["example-url1 = {'url': 'https://example.com/my-package-0.1.0.tar.gz'}"],
+                "tool.poetry.dev.dependencies": ["example-url2 = {'url': 'https://example.com/my-package-0.2.0.tar.gz'}"],
+            }
+        )
+    ]
+)
+def test_dependency_check_parse(toml, expected):
+    dependencies = Dependencies(toml).parse()
+    assert dependencies.illegal == expected
+
+
+@pytest.mark.parametrize(
+    "toml,expected",
+    [
+        (
+            """
+[tool.poetry.dependencies]
+python = "^3.8"
+example-url1 = {url = "https://example.com/my-package-0.1.0.tar.gz"}
+
+[tool.poetry.dev.dependencies]
+nox = ">=2022.8.7"
+example-url2 = {url = "https://example.com/my-package-0.2.0.tar.gz"}
+
+[tool.poetry.group.test.dependencies]
+sphinx = ">=5.3,<8"
+example-git = {git = "git@github.com:requests/requests.git"}
+
+[tool.poetry.group.dev.dependencies]
+pytest = ">=7.2.2,<9"
+example-path1 = {path = "../my-package/dist/my-package-0.1.0.tar.gz"}
+example-path2 = {path = "../my-package/dist/my-package-0.2.0.tar.gz"}
+            """,
+            """5 illegal dependencies
+
+[tool.poetry.dependencies]
+example-url1 = {'url': 'https://example.com/my-package-0.1.0.tar.gz'}
+
+[tool.poetry.dev.dependencies]
+example-url2 = {'url': 'https://example.com/my-package-0.2.0.tar.gz'}
+
+[tool.poetry.group.test.dependencies]
+example-git = {'git': 'git@github.com:requests/requests.git'}
+
+[tool.poetry.group.dev.dependencies]
+example-path1 = {'path': '../my-package/dist/my-package-0.1.0.tar.gz'}
+example-path2 = {'path': '../my-package/dist/my-package-0.2.0.tar.gz'}
+
+"""
+        ),
+    ]
+)
+def test_dependencies_check_report(toml, expected, capsys):
+    console = rich.console.Console()
+    dependencies = Dependencies(toml).parse()
+    report_illegal(dependencies.illegal, console)
+    assert capsys.readouterr().out == expected