diff --git a/.gitmodules b/.gitmodules
index a7b8c08e..2981416e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +1,4 @@
 [submodule "submodules/vrs"]
 	path = submodules/vrs
 	url = https://github.com/ga4gh/vrs.git
-	branch = 2.1.0-snapshot.2026-02
+	branch = 2.1
diff --git a/src/ga4gh/core/models.py b/src/ga4gh/core/models.py
index 7492194b..571cb22d 100644
--- a/src/ga4gh/core/models.py
+++ b/src/ga4gh/core/models.py
@@ -22,9 +22,9 @@
 
 
 class GKSCoreMetadataMixin(GKSMetadataMixin):
-    """Provide GKS-Core model metadata."""
+    """Provide gkm-core model metadata."""
 
-    _product_name = "gks-core"
+    _product_name = "gkm-core"
     _product_version = CORE_VERSION
 
 
@@ -220,7 +220,7 @@ class ConceptMapping(GKSCoreMetadataMixin, Element, BaseModelForbidExtra):
     )
 
 
-class ConceptSet(GKSCoreMetadataMixin, Element, BaseModelForbidExtra):
+class ConceptSet(GKSCoreMetadataMixin, Entity, BaseModelForbidExtra):
     """A set of concepts that may be considered as dependent (occurring together), or
     independent (existing separately) in the context of some knowledge reported about
     them, as indicated by a set membership operator. e.g. a set of independent molecular
@@ -271,11 +271,15 @@ class Extension(GKSCoreMetadataMixin, Element, BaseModelForbidExtra):
     )
 
 
-class MappableConcept(GKSCoreMetadataMixin, Element, BaseModelForbidExtra):
+class MappableConcept(GKSCoreMetadataMixin, Entity, BaseModelForbidExtra):
     """A concept based on a primaryCoding and/or name that may be mapped to one or more other `Codings`."""
 
     _maturity: ClassVar[Maturity] = Maturity.TRIAL_USE
 
+    type: Literal["MappableConcept"] = Field(
+        default="MappableConcept",
+        description='MUST be "MappableConcept".',
+    )
     conceptType: str | None = Field(  # noqa: N815
         default=None,
         description="A term indicating the type of concept being represented by the MappableConcept.",
diff --git a/src/ga4gh/core/version.py b/src/ga4gh/core/version.py
index 74c4d4f1..982aa6c9 100644
--- a/src/ga4gh/core/version.py
+++ b/src/ga4gh/core/version.py
@@ -1,3 +1,3 @@
-"""Define GKS-Core version"""
+"""Define GKM-Core version"""
 
-CORE_VERSION = "1.1.0"
+CORE_VERSION = "1.2.0"
diff --git a/src/ga4gh/vrs/version.py b/src/ga4gh/vrs/version.py
index 281da683..00b1afa9 100644
--- a/src/ga4gh/vrs/version.py
+++ b/src/ga4gh/vrs/version.py
@@ -1,3 +1,3 @@
 """Define VRS version"""
 
-VRS_VERSION = "2.1.0-snapshot.2026-02.2"
+VRS_VERSION = "2.1.0"
diff --git a/submodules/vrs b/submodules/vrs
index 83791ac4..cf33bfa7 160000
--- a/submodules/vrs
+++ b/submodules/vrs
@@ -1 +1 @@
-Subproject commit 83791ac4294a59ce48400eb66c34af86a12a3704
+Subproject commit cf33bfa7618011087655d5a5898e518c9d96bcdb
diff --git a/tests/validation/test_model_metadata.py b/tests/validation/test_model_metadata.py
index 77260795..5088531d 100644
--- a/tests/validation/test_model_metadata.py
+++ b/tests/validation/test_model_metadata.py
@@ -16,11 +16,11 @@
         core_models,
         SUBMODULES_DIR
         / "submodules"
-        / "gks-core"
+        / "gkm-core"
         / "schema"
-        / "gks-core"
-        / "gks-core-source.yaml",
-        SUBMODULES_DIR / "submodules" / "gks-core" / "schema" / "gks-core" / "json",
+        / "gkm-core"
+        / "gkm-core-source.yaml",
+        SUBMODULES_DIR / "submodules" / "gkm-core" / "schema" / "gkm-core" / "json",
     ),
     (
         vrs_models,
diff --git a/tests/validation/test_schemas.py b/tests/validation/test_schemas.py
index 88ad9591..322a30dc 100644
--- a/tests/validation/test_schemas.py
+++ b/tests/validation/test_schemas.py
@@ -61,7 +61,7 @@ def _update_gks_schema_mapping(
 # Get core classes
 core_mapping = GKS_SCHEMA_MAPPING[GKSSchema.CORE]
 for f in (
-    SUBMODULES_DIR / "submodules" / "gks-core" / "schema" / "gks-core" / "json"
+    SUBMODULES_DIR / "submodules" / "gkm-core" / "schema" / "gkm-core" / "json"
 ).glob("*"):
     _update_gks_schema_mapping(f, core_mapping)