diff --git a/com.unity.ml-agents/CHANGELOG.md b/com.unity.ml-agents/CHANGELOG.md
index 21d20ce64c..6e049c31c4 100755
--- a/com.unity.ml-agents/CHANGELOG.md
+++ b/com.unity.ml-agents/CHANGELOG.md
@@ -27,6 +27,8 @@ and this project adheres to
 
 #### ml-agents / ml-agents-envs
 - Bumped numpy version to >=1.21.2,<1.24.0 (#5997)
+- Bumped onnx version to 1.15.0 (#6062)
+- Bumped protobuf version to >=3.6,<21 (#6062)
 
 ## [3.0.0-exp.1] - 2023-10-09
 ### Major Changes
diff --git a/ml-agents-envs/setup.py b/ml-agents-envs/setup.py
index d224fb4a7b..37bf04bc64 100644
--- a/ml-agents-envs/setup.py
+++ b/ml-agents-envs/setup.py
@@ -56,7 +56,7 @@ def run(self):
         "cloudpickle",
         "grpcio>=1.11.0,<=1.48.2",
         "Pillow>=4.2.1",
-        "protobuf>=3.6,<3.20",
+        "protobuf>=3.6,<3.21",
         "pyyaml>=3.1.0",
         "gym>=0.21.0",
         "pettingzoo==1.15.0",
diff --git a/ml-agents/setup.py b/ml-agents/setup.py
index eff409bf48..d735201c21 100644
--- a/ml-agents/setup.py
+++ b/ml-agents/setup.py
@@ -60,7 +60,7 @@ def run(self):
         f"mlagents_envs=={VERSION}",
         "numpy>=1.21.2,<1.24.0",
         "Pillow>=4.2.1",
-        "protobuf>=3.6,<3.20",
+        "protobuf>=3.6,<3.21",
         "pyyaml>=3.1.0",
         "torch>=2.1.1",
         "tensorboard>=2.14",
@@ -72,7 +72,7 @@ def run(self):
         "attrs>=19.3.0",
         "huggingface_hub>=0.14",
         'pypiwin32==223;platform_system=="Windows"',
-        "onnx==1.12.0",
+        "onnx==1.15.0",
     ],
     python_requires=">=3.10.1,<=3.10.12",
     entry_points={