diff --git a/tfhe/src/shortint/parameters/classic/tuniform/p_fail_2_minus_64/ks_pbs.rs b/tfhe/src/shortint/parameters/classic/tuniform/p_fail_2_minus_64/ks_pbs.rs
index 07ed6c954..7dc4762fd 100644
--- a/tfhe/src/shortint/parameters/classic/tuniform/p_fail_2_minus_64/ks_pbs.rs
+++ b/tfhe/src/shortint/parameters/classic/tuniform/p_fail_2_minus_64/ks_pbs.rs
@@ -4,19 +4,19 @@ use crate::shortint::parameters::{CarryModulus, ClassicPBSParameters, MessageMod
 
 pub const PARAM_MESSAGE_2_CARRY_2_KS_PBS_TUNIFORM_2M64: ClassicPBSParameters =
     ClassicPBSParameters {
-        lwe_dimension: LweDimension(918),
+        lwe_dimension: LweDimension(879),
         glwe_dimension: GlweDimension(1),
-        polynomial_size: PolynomialSize(2048),
+        polynomial_size: PolynomialSize(4096),
         lwe_noise_distribution: DynamicDistribution::new_t_uniform(45),
         glwe_noise_distribution: DynamicDistribution::new_t_uniform(17),
         pbs_base_log: DecompositionBaseLog(23),
         pbs_level: DecompositionLevelCount(1),
-        ks_base_log: DecompositionBaseLog(4),
-        ks_level: DecompositionLevelCount(4),
+        ks_base_log: DecompositionBaseLog(3),
+        ks_level: DecompositionLevelCount(5),
         message_modulus: MessageModulus(4),
         carry_modulus: CarryModulus(4),
         max_noise_level: MaxNoiseLevel::new(5),
-        log2_p_fail: -71.625,
+        log2_p_fail: -138.803,
         ciphertext_modulus: CiphertextModulus::new_native(),
         encryption_key_choice: EncryptionKeyChoice::Big,
     };