diff --git a/bearssl_pkey_decoder.nim b/bearssl_pkey_decoder.nim
index 7d532cc..49cfc86 100644
--- a/bearssl_pkey_decoder.nim
+++ b/bearssl_pkey_decoder.nim
@@ -37,11 +37,11 @@ proc pkeyDecoderInit*(
 ) {.bearSslFunc, importc: "br_pkey_decoder_init".}
 
 proc pkeyDecoderPush*(
-  ctx: ptr PkeyDecoderContext, data: pointer, len: uint
+  ctx: ptr PkeyDecoderContext, data: pointer, len: csize_t
 ) {.bearSslFunc, importc: "br_pkey_decoder_push".}
 
 proc skeyDecoderPushShim*(
-  ctx: pointer, data: pointer, len: uint
+  ctx: pointer, data: pointer, len: csize_t
 ) {.cdecl, noSideEffect, gcsafe, importc.}
 
 proc pkeyDecoderLastError*(ctx: ptr PkeyDecoderContext): cint =
diff --git a/bearssl_pkey_decoder.nimble b/bearssl_pkey_decoder.nimble
index aba469e..e7706ca 100644
--- a/bearssl_pkey_decoder.nimble
+++ b/bearssl_pkey_decoder.nimble
@@ -9,5 +9,5 @@ license       = "MIT"
 
 # Dependencies
 
-requires "nim >= 0.19.0"
-requires "bearssl"
+requires "nim >= 1.6.0"
+requires "bearssl >= 0.2.7"