diff --git a/Cargo.lock b/Cargo.lock
deleted file mode 100644
index 1037dee..0000000
--- a/Cargo.lock
+++ /dev/null
@@ -1,93 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "autocfg"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
-
-[[package]]
-name = "bitflags"
-version = "2.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "327762f6e5a765692301e5bb513e0d9fef63be86bbc14528052b1cd3e6f03e07"
-
-[[package]]
-name = "log"
-version = "0.4.20"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
-
-[[package]]
-name = "mos6502"
-version = "0.5.0"
-dependencies = [
- "bitflags",
- "log",
- "num",
-]
-
-[[package]]
-name = "num"
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-dependencies = [
- "num-complex",
- "num-integer",
- "num-iter",
- "num-rational",
- "num-traits",
-]
-
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-dependencies = [
- "num-traits",
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-
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- "num-traits",
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-dependencies = [
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- "num-integer",
- "num-traits",
-]
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- "num-traits",
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-dependencies = [
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diff --git a/Cargo.toml b/Cargo.toml
index 3f6b3b9..481588c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -43,11 +43,6 @@ name = "mos6502"
 bitflags = "2.3.3"
 log = "0.4.19"
 
-[dependencies.num]
-version = "0.4.0"
-# no_std support
-default-features = false
-
 [features]
 decimal_mode = []
 default = ["decimal_mode"]
diff --git a/src/cpu.rs b/src/cpu.rs
index ac5d2a6..ec1ef84 100644
--- a/src/cpu.rs
+++ b/src/cpu.rs
@@ -440,7 +440,7 @@ impl<M: Bus, V: Variant> CPU<M, V> {
             }
             (Instruction::PHP, OpInput::UseImplied) => {
                 // Push status
-                let val = self.registers.status.bits();
+                let val = self.registers.status.bits() | 0x30;
                 self.push_on_stack(val);
             }
             (Instruction::PLA, OpInput::UseImplied) => {
@@ -1088,7 +1088,6 @@ mod tests {
     use super::*;
     use crate::instruction::Nmos6502;
     use crate::memory::Memory as Ram;
-    use num::range_inclusive;
 
     #[test]
     fn dont_panic_for_overflow() {
@@ -1247,6 +1246,16 @@ mod tests {
         assert!(cpu.registers.status.contains(Status::PS_CARRY));
     }
 
+    #[test]
+    fn php_sets_bits_4_and_5() {
+        let mut cpu = CPU::new(Ram::new());
+        cpu.execute_instruction((Instruction::PHP, OpInput::UseImplied));
+        cpu.execute_instruction((Instruction::PLA, OpInput::UseImplied));
+        cpu.execute_instruction((Instruction::AND, OpInput::UseImmediate(0x30)));
+
+        assert_eq!(cpu.registers.accumulator, 0x30);
+    }
+
     #[test]
     fn and_test() {
         let mut cpu = CPU::new(Ram::new(), Nmos6502);
@@ -1678,8 +1687,8 @@ mod tests {
     fn exclusive_or_test() {
         let mut cpu = CPU::new(Ram::new(), Nmos6502);
 
-        for a_before in range_inclusive(0u8, 255u8) {
-            for val in range_inclusive(0u8, 255u8) {
+        for a_before in 0u8..=255u8 {
+            for val in 0u8..=255u8 {
                 cpu.execute_instruction((Instruction::LDA, OpInput::UseImmediate(a_before)));
 
                 cpu.exclusive_or(val);
@@ -1706,8 +1715,8 @@ mod tests {
     fn inclusive_or_test() {
         let mut cpu = CPU::new(Ram::new(), Nmos6502);
 
-        for a_before in range_inclusive(0u8, 255u8) {
-            for val in range_inclusive(0u8, 255u8) {
+        for a_before in 0u8..=255u8 {
+            for val in 0u8..=255u8 {
                 cpu.execute_instruction((Instruction::LDA, OpInput::UseImmediate(a_before)));
 
                 cpu.inclusive_or(val);
diff --git a/src/lib.rs b/src/lib.rs
index 2f432ea..302a8c1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -31,8 +31,6 @@
 #[macro_use]
 extern crate log;
 
-extern crate num;
-
 #[macro_use]
 extern crate bitflags;