diff --git a/.github/workflows/tests-and-linters.yml b/.github/workflows/tests-and-linters.yml
index 86f7358f..266c004f 100644
--- a/.github/workflows/tests-and-linters.yml
+++ b/.github/workflows/tests-and-linters.yml
@@ -40,8 +40,7 @@ jobs:
     name: Run tests with coverage
     runs-on: ubuntu-latest
     env:
-      # Cython's version <3 issue with tracing: "error: no member named 'use_tracing' in 'struct _PyCFrame'"
-      # DEPENDENCY_INJECTOR_DEBUG_MODE: 1
+      DEPENDENCY_INJECTOR_DEBUG_MODE: 1
       COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
@@ -49,7 +48,7 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: 3.12
-      - run: pip install tox cython==0.29.37
+      - run: pip install tox 'cython>=3,<4'
       - run: make cythonize
       - run: tox
         env:
diff --git a/Makefile b/Makefile
index 0c4bca04..8466381a 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ VERSION := $(shell python setup.py --version)
 
 CYTHON_SRC := $(shell find src/dependency_injector -name '*.pyx')
 
-CYTHON_DIRECTIVES = -Xlanguage_level=2
+CYTHON_DIRECTIVES = -Xlanguage_level=3
 
 ifdef DEPENDENCY_INJECTOR_DEBUG_MODE
 	CYTHON_DIRECTIVES += -Xprofile=True
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 2981cf0a..adc34cd0 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
-cython==0.29.37
+cython>=3,<4
 pytest
 pytest-asyncio
 tox
diff --git a/requirements-ext.txt b/requirements-ext.txt
index 0a5e3ebc..138447f1 100644
--- a/requirements-ext.txt
+++ b/requirements-ext.txt
@@ -1,3 +1,3 @@
 flask==2.1.3
 werkzeug==2.2.2
-aiohttp==3.9.0b1
+aiohttp
diff --git a/tox.ini b/tox.ini
index fadbda68..5d69b808 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,7 +28,7 @@ passenv = GITHUB_*, COVERALLS_*
 basepython=python3.12
 deps=
     {[testenv]deps}
-    cython<3.0
+    cython>=3,<4
     coverage
     coveralls
 commands=