diff --git a/Cargo.lock b/Cargo.lock
index 01b7939..81f8643 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -16,9 +16,9 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
 name = "bitflags"
-version = "2.0.2"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "487f1e0fcbe47deb8b0574e646def1c903389d95241dd1bbcc6ce4a715dfc0c1"
+checksum = "c70beb79cbb5ce9c4f8e20849978f34225931f665bb49efa6982875a4d5facb3"
 
 [[package]]
 name = "bytecount"
@@ -125,9 +125,9 @@ checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
 
 [[package]]
 name = "mos6502"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
- "bitflags 2.0.2",
+ "bitflags 2.1.0",
  "log",
  "num",
  "skeptic",
diff --git a/Cargo.toml b/Cargo.toml
index 575d9be..6008985 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -41,7 +41,7 @@ edition = "2021"
 name = "mos6502"
 
 [dependencies]
-bitflags = "2.0.2"
+bitflags = "2.1.0"
 log = "0.4.17"
 
 [dependencies.num]