diff --git a/nimsimd.nimble b/nimsimd.nimble
index c6e1da5..67abb0b 100644
--- a/nimsimd.nimble
+++ b/nimsimd.nimble
@@ -1,4 +1,4 @@
-version     = "1.2.8"
+version     = "1.2.9"
 author      = "Ryan Oldenburg"
 description = "Pleasant Nim bindings for SIMD instruction sets."
 license     = "MIT"
diff --git a/src/nimsimd/avx2.nim b/src/nimsimd/avx2.nim
index c51f51a..5425433 100644
--- a/src/nimsimd/avx2.nim
+++ b/src/nimsimd/avx2.nim
@@ -214,6 +214,8 @@ func mm256_permute2x128_si256*(a, b: M256i, imm8: int32 | uint32): M256i {.impor
 
 func mm256_permute4x64_epi64*(a: M256i, imm8: int32 | uint32): M256i {.importc: "_mm256_permute4x64_epi64".}
 
+func mm256_permute4x64_pd*(a: M256d, imm8: int32 | uint32): M256d {.importc: "_mm256_permute4x64_pd".}
+
 func mm256_permutevar8x32_epi32*(a, idx: M256i): M256i {.importc: "_mm256_permutevar8x32_epi32".}
 
 func mm256_permutevar8x32_ps*(a: M256, idx: M256i): M256 {.importc: "_mm256_permutevar8x32_ps".}