diff --git a/openmls/src/group/tests_and_kats/tests/proposal_validation.rs b/openmls/src/group/tests_and_kats/tests/proposal_validation.rs
index aba7dcdbe..7f5885a38 100644
--- a/openmls/src/group/tests_and_kats/tests/proposal_validation.rs
+++ b/openmls/src/group/tests_and_kats/tests/proposal_validation.rs
@@ -1,11 +1,7 @@
 //! This module tests the validation of proposals as defined in
 //! https://book.openmls.tech/message_validation.html#semantic-validation-of-proposals-covered-by-a-commit
 
-use crate::{
-    storage::OpenMlsProvider,
-    test_utils::frankenstein::*,
-    treesync::{errors::LeafNodeValidationError, LeafNodeParameters},
-};
+use crate::{storage::OpenMlsProvider, test_utils::frankenstein::*, treesync::LeafNodeParameters};
 use openmls_traits::{
     prelude::{openmls_types::*, *},
     signatures::Signer,
@@ -1002,10 +998,6 @@ enum KeyPackageTestVersion {
     WrongCiphersuite,
     // Wrong version in the KeyPackage
     WrongVersion,
-    // Unsupported ciphersuite in the KeyPackage's capabilities
-    UnsupportedVersion,
-    // Unsupported ciphersuite in the KeyPackage's capabilities
-    UnsupportedCiphersuite,
     // Positive case
     ValidTestCase,
 }
@@ -1046,8 +1038,6 @@ fn test_valsem105() {
     for key_package_version in [
         KeyPackageTestVersion::WrongCiphersuite,
         KeyPackageTestVersion::WrongVersion,
-        //KeyPackageTestVersion::UnsupportedVersion,
-        // KeyPackageTestVersion::UnsupportedCiphersuite,
         KeyPackageTestVersion::ValidTestCase,
     ] {
         println!("running test {key_package_version:?}");
@@ -1083,13 +1073,6 @@ fn test_valsem105() {
             KeyPackageTestVersion::WrongVersion => {
                 franken_key_package.protocol_version = 999;
             }
-            KeyPackageTestVersion::UnsupportedVersion => {
-                franken_key_package.leaf_node.capabilities.versions = vec![999];
-            }
-            KeyPackageTestVersion::UnsupportedCiphersuite => {
-                franken_key_package.leaf_node.capabilities.ciphersuites =
-                    vec![Ciphersuite::MLS_256_DHKEMX448_CHACHA20POLY1305_SHA512_Ed448.into()];
-            }
             KeyPackageTestVersion::ValidTestCase => (),
         };
 
@@ -1120,13 +1103,6 @@ fn test_valsem105() {
                 KeyPackageTestVersion::WrongVersion => {
                     franken_key_package.protocol_version = 999;
                 }
-                KeyPackageTestVersion::UnsupportedVersion => {
-                    franken_key_package.leaf_node.capabilities.versions = vec![999];
-                }
-                KeyPackageTestVersion::UnsupportedCiphersuite => {
-                    franken_key_package.leaf_node.capabilities.ciphersuites =
-                        vec![Ciphersuite::MLS_256_DHKEMX448_CHACHA20POLY1305_SHA512_Ed448.into()];
-                }
                 KeyPackageTestVersion::ValidTestCase => (),
             };
 
@@ -1322,45 +1298,6 @@ fn test_valsem105() {
                         )
                     );
                 }
-                KeyPackageTestVersion::UnsupportedVersion => {
-                    assert!(
-                        matches!(
-                            err,
-                            ProcessMessageError::ValidationError(
-                                ValidationError::KeyPackageVerifyError(
-                                    KeyPackageVerifyError::InvalidProtocolVersion,
-                                ),
-                            )
-                        ) || matches!(
-                            err,
-                            ProcessMessageError::InvalidCommit(
-                                StageCommitError::ProposalValidationError(
-                                    ProposalValidationError::LeafNodeValidation(
-                                        LeafNodeValidationError::CiphersuiteNotInCapabilities
-                                    ),
-                                ),
-                            )
-                        ),
-                        "unexpected error: {:?}",
-                        err
-                    );
-                }
-                KeyPackageTestVersion::UnsupportedCiphersuite => {
-                    assert!(
-                        matches!(
-                            err,
-                            ProcessMessageError::InvalidCommit(
-                                StageCommitError::ProposalValidationError(
-                                    ProposalValidationError::LeafNodeValidation(
-                                        LeafNodeValidationError::CiphersuiteNotInCapabilities
-                                    ),
-                                ),
-                            )
-                        ),
-                        "unexpected error: {:?}",
-                        err
-                    );
-                }
             };
 
             let original_update_plaintext =