diff --git a/pyproject.toml b/pyproject.toml
index a8c52fc176..94ed3a2c36 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ classifiers = [
 ]
 dependencies = [
     # Core
-    "numpy>=1.24.3",
+    "numpy>=1.24.3,<2.0.0",  # TODO: remove upper bound after spacy/thinc release
     "cython>=0.29.30",
     "scipy>=1.11.2",
     "torch>=2.1",
@@ -65,10 +65,10 @@ dependencies = [
     "coqui-tts-trainer>=0.1.4",
     "coqpit>=0.0.16",
     # Gruut + supported languages
-    "gruut[de,es,fr]==2.2.3",
+    "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