diff --git a/pyproject.toml b/pyproject.toml
index 9e52cd71f9..7c297fbffb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 requires = [
     "setuptools",
     "setuptools-scm",
-    "cython",
+    "cython>=3.0.0",
     "numpy>=2.0.0",
 ]
 build-backend = "setuptools.build_meta"
@@ -44,8 +44,8 @@ classifiers = [
 ]
 dependencies = [
     # Core
-    "numpy>=1.25.2,<2",
-    "cython==3.0.11",         # Added exact version
+    "numpy>=1.25.2",
+    "cython>=3.0.0",
     "scipy>=1.11.2",
     "torch>=2.4",
     "torchaudio",
@@ -68,15 +68,12 @@ dependencies = [
     "gruut[de,es,fr]>=2.4.0",
     # Tortoise
     "einops>=0.6.0",
-    "transformers>=4.42.0",
+    "transformers>=4.42.0,<4.43.0",
     # Bark
     "encodec>=0.1.1",
     # XTTS
     "num2words>=0.5.11",
-    "spacy[ja]==3.7.5",         # Added exact version
-    "soxr==0.4.0",              # Added exact version
-    "scikit-learn==1.5.1",      # Added exact version
-    "contourpy==1.2.1",         # Added exact version
+    "spacy[ja]>=3,<3.8",
 ]
 
 [project.optional-dependencies]