diff --git a/evm/src/cpu/kernel/tests/bignum/mod.rs b/evm/src/cpu/kernel/tests/bignum/mod.rs
index 236c5acc..aa9d1aa0 100644
--- a/evm/src/cpu/kernel/tests/bignum/mod.rs
+++ b/evm/src/cpu/kernel/tests/bignum/mod.rs
@@ -506,9 +506,9 @@ fn test_modmul_bignum_all() -> Result<()> {
 
 #[test]
 fn test_modexp_bignum_all() -> Result<()> {
-    let exp_bit_sizes = vec![2, 20, 31, 40];
+    let exp_bit_sizes = vec![2, 9, 11, 16];
 
-    for bit_size in &BIT_SIZES_TO_TEST[3..9] {
+    for bit_size in &BIT_SIZES_TO_TEST[3..7] {
         for exp_bit_size in &exp_bit_sizes {
             let b = gen_bignum(*bit_size);
             let e = gen_bignum(*exp_bit_size);
@@ -531,7 +531,7 @@ fn test_modexp_bignum_all() -> Result<()> {
     let inputs = test_data_biguint(TEST_DATA_BIGNUM_INPUTS);
     let modexp_outputs = test_data_biguint(TEST_DATA_MODEXP_OUTPUTS);
     let mut modexp_outputs_iter = modexp_outputs.into_iter();
-    for b in &inputs[..13] {
+    for b in &inputs[..9] {
         // Include only smaller exponents, to keep tests from becoming too slow.
         for e in &inputs[..7] {
             // For m, skip the first input, which is zero.