diff --git a/noxfile.py b/noxfile.py
index ce2d2c3865..7ce394640a 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -62,8 +62,6 @@
     "3.11": ["2.42.0", "2.47.1"],
 }
 UNIT_TEST_STANDARD_DEPENDENCIES = [
-    "mock",
-    "asyncmock",
     "pytest",
     "pytest-cov",
     "pytest-asyncio",
diff --git a/testing/constraints-3.10.txt b/testing/constraints-3.10.txt
index b931b4f348..e9fe2ca303 100644
--- a/testing/constraints-3.10.txt
+++ b/testing/constraints-3.10.txt
@@ -5,7 +5,6 @@ google-api-core==2.21.0 # Tests google-api-core with rest async support
 google-auth==2.47.0 # Tests google-auth with rest async support
 proto-plus==1.22.3
 protobuf
-mock==4.0.2
 google-cloud-storage==3.0.0 # Updated to v3.x, backward compatible with v2.x via wrapper
 packaging==24.1 # Increased to unbreak canonicalize_version error (b/377774673)
 grpcio-testing==1.34.0
diff --git a/testing/constraints-3.11.txt b/testing/constraints-3.11.txt
index 205412f0e5..45130293eb 100644
--- a/testing/constraints-3.11.txt
+++ b/testing/constraints-3.11.txt
@@ -5,7 +5,6 @@ google-api-core==2.21.0 # Tests google-api-core with rest async support
 google-auth==2.47.0 # Tests google-auth with rest async support
 proto-plus
 protobuf
-mock==4.0.2
 google-cloud-storage==3.0.0 # Updated to v3.x, backward compatible with v2.x via wrapper
 packaging==24.1 # Increased to unbreak canonicalize_version error (b/377774673)
 pytest-xdist==3.3.1 # Pinned to unbreak unit tests
diff --git a/testing/constraints-3.12.txt b/testing/constraints-3.12.txt
index 35b3def89d..3d171a0e51 100644
--- a/testing/constraints-3.12.txt
+++ b/testing/constraints-3.12.txt
@@ -4,7 +4,6 @@
 google-api-core==2.21.0 # Tests google-api-core with rest async support
 google-auth==2.47.0 # Tests google-auth with rest async support
 proto-plus
-mock==4.0.2
 google-cloud-storage==3.0.0 # Updated to v3.x, backward compatible with v2.x via wrapper
 packaging==24.1 # Increased to unbreak canonicalize_version error (b/377774673)
 pytest-xdist==3.3.1 # Pinned to unbreak unit tests
diff --git a/testing/constraints-3.13.txt b/testing/constraints-3.13.txt
index ecc94df9ac..e2cc479699 100644
--- a/testing/constraints-3.13.txt
+++ b/testing/constraints-3.13.txt
@@ -4,7 +4,6 @@
 google-api-core==2.27.0 # Tests google-api-core with rest async support
 google-auth==2.47.0 # Tests google-auth with rest async support
 proto-plus
-mock==4.0.2
 google-cloud-storage==3.10.0 # Updated to v3.x, backward compatible with v2.x via wrapper
 packaging==24.1 # Increased to unbreak canonicalize_version error (b/377774673)
 pytest-xdist==3.3.1 # Pinned to unbreak unit tests
diff --git a/testing/constraints-3.14.txt b/testing/constraints-3.14.txt
index d3d2ea38b7..85983ca9e7 100644
--- a/testing/constraints-3.14.txt
+++ b/testing/constraints-3.14.txt
@@ -4,7 +4,6 @@
 google-api-core==2.27.0
 google-auth==2.47.0 # Tests google-auth with rest async support
 proto-plus
-mock==4.0.2
 google-cloud-storage==3.10.0 # Updated for Python 3.14 compatibility
 packaging==24.1 # Increased to unbreak canonicalize_version error (b/377774673)
 pytest-xdist==3.3.1 # Pinned to unbreak unit tests
diff --git a/testing/constraints-3.8.txt b/testing/constraints-3.8.txt
index cbd2bf5690..18e42bbc6e 100644
--- a/testing/constraints-3.8.txt
+++ b/testing/constraints-3.8.txt
@@ -6,7 +6,6 @@ google-api-core==2.17.1 # Increased for gapic owlbot presubmit tests
 google-auth==2.14.1 # Tests google-auth without rest async support
 proto-plus==1.22.3
 protobuf
-mock==4.0.2
 google-cloud-storage==3.0.0 # Updated to v3.x, backward compatible with v2.x via wrapper
 packaging==24.1 # Increased to unbreak canonicalize_version error (b/377774673)
 grpcio-testing==1.34.0
diff --git a/testing/constraints-3.9.txt b/testing/constraints-3.9.txt
index 63f2d6d147..8ffcc248bc 100644
--- a/testing/constraints-3.9.txt
+++ b/testing/constraints-3.9.txt
@@ -5,7 +5,6 @@ google-api-core==2.21.0 # Tests google-api-core with rest async support
 google-auth==2.47.0 # Tests google-auth with rest async support
 proto-plus==1.22.3
 protobuf
-mock==4.0.2
 google-cloud-storage==3.0.0 # Updated to v3.x, backward compatible with v2.x via wrapper
 packaging==24.1 # Increased to unbreak canonicalize_version error (b/377774673)
 grpcio-testing==1.34.0
diff --git a/testing/constraints-ray-2.33.0.txt b/testing/constraints-ray-2.33.0.txt
index 10bc7c96f9..266d63479e 100644
--- a/testing/constraints-ray-2.33.0.txt
+++ b/testing/constraints-ray-2.33.0.txt
@@ -3,7 +3,6 @@ ray==2.33.0
 google-api-core
 proto-plus==1.22.3
 protobuf
-mock==4.0.2
 google-cloud-storage==3.0.0 # Updated to v3.x, backward compatible with v2.x via wrapper
 packaging==24.1 # Increased to unbreak canonicalize_version error (b/377774673)
 grpcio-testing==1.34.0
diff --git a/testing/constraints-ray-2.42.0.txt b/testing/constraints-ray-2.42.0.txt
index 5844dca74f..d342cee14e 100644
--- a/testing/constraints-ray-2.42.0.txt
+++ b/testing/constraints-ray-2.42.0.txt
@@ -3,7 +3,6 @@ ray==2.42.0
 google-api-core
 proto-plus==1.22.3
 protobuf
-mock==4.0.2
 google-cloud-storage==3.0.0 # Updated to v3.x, backward compatible with v2.x via wrapper
 packaging==24.1 # Increased to unbreak canonicalize_version error (b/377774673)
 grpcio-testing==1.34.0
diff --git a/testing/constraints-ray-2.47.1.txt b/testing/constraints-ray-2.47.1.txt
index 2615289db0..0f655a1f88 100644
--- a/testing/constraints-ray-2.47.1.txt
+++ b/testing/constraints-ray-2.47.1.txt
@@ -3,7 +3,6 @@ ray==2.47.1
 google-api-core
 proto-plus==1.22.3
 protobuf
-mock==4.0.2
 google-cloud-storage==3.0.0 # Updated to v3.x, backward compatible with v2.x via wrapper
 packaging==24.1 # Increased to unbreak canonicalize_version error (b/377774673)
 grpcio-testing==1.34.0
diff --git a/tests/unit/vertex_rag/test_rag_constants_preview.py b/tests/unit/vertex_rag/test_rag_constants_preview.py
index 9819137268..7e0b13fd5a 100644
--- a/tests/unit/vertex_rag/test_rag_constants_preview.py
+++ b/tests/unit/vertex_rag/test_rag_constants_preview.py
@@ -282,7 +282,6 @@
     name=TEST_RAG_CORPUS_RESOURCE_NAME,
     display_name=TEST_CORPUS_DISPLAY_NAME,
     description=TEST_CORPUS_DISCRIPTION,
-    embedding_model_config=TEST_EMBEDDING_MODEL_CONFIG,
 )
 TEST_CMEK_RAG_CORPUS = RagCorpus(
     name=TEST_RAG_CORPUS_RESOURCE_NAME,