diff --git a/Cargo.toml b/Cargo.toml
index f4f5a7d..2fd30ab 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "versionize_derive"
-version = "0.1.1"
+version = "0.1.2"
 license = "Apache-2.0"
 authors = ["Amazon Firecracker team <firecracker-devel@amazon.com>"]
 description = "Implements the Versionize derive proc macro."
diff --git a/src/descriptors/struct_desc.rs b/src/descriptors/struct_desc.rs
index dbeac4d..78fc578 100644
--- a/src/descriptors/struct_desc.rs
+++ b/src/descriptors/struct_desc.rs
@@ -71,8 +71,12 @@ impl Descriptor for StructDescriptor {
 
         // Generate code to map the app version to struct version and wrap the
         // deserializers with the `version` match.
+        let current_version = self.version();
         quote! {
             let version = version_map.get_type_version(app_version, <Self as Versionize>::type_id());
+            if app_version == version_map.latest_version() && version != #current_version {
+                return Err(VersionizeError::VersionMapNotUpdated);
+            }
             match version {
                 #versioned_deserializers
                 _ => panic!("Unknown {:?} version {}.", <Self as Versionize>::type_id(), version)
diff --git a/src/descriptors/union_desc.rs b/src/descriptors/union_desc.rs
index 9a5723e..9fc3f24 100644
--- a/src/descriptors/union_desc.rs
+++ b/src/descriptors/union_desc.rs
@@ -40,8 +40,12 @@ impl Descriptor for UnionDescriptor {
             });
         }
 
+        let current_version = self.version();
         quote! {
             let version = version_map.get_type_version(app_version, Self::type_id());
+            if app_version == version_map.latest_version() && version != #current_version {
+                return Err(VersionizeError::VersionMapNotUpdated);
+            }
             match version {
                 #versioned_deserializers
                 _ => panic!("Unknown {:?} version {}.", Self::type_id(), version)
diff --git a/src/lib.rs b/src/lib.rs
index d479149..bd42d0d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -50,9 +50,13 @@ pub fn impl_versionize(input: TokenStream) -> proc_macro::TokenStream {
     let version = descriptor.version();
     let versioned_serializer = descriptor.generate_serializer();
     let deserializer = descriptor.generate_deserializer();
+    let current_version = version;
     let serializer = quote! {
         // Get the struct version for the input app_version.
         let version = version_map.get_type_version(app_version, <Self as Versionize>::type_id());
+        if app_version == version_map.latest_version() && version != #current_version {
+            return Err(VersionizeError::VersionMapNotUpdated);
+        }
         // We will use this copy to perform semantic serialization.
         let mut copy_of_self = self.clone();
         match version {