diff --git a/Day1.cs b/Day1.cs
index 0cc0176..2b7be62 100644
--- a/Day1.cs
+++ b/Day1.cs
@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 
 namespace aoc2019
diff --git a/Day11.cs b/Day11.cs
index 6ec157d..005d32d 100644
--- a/Day11.cs
+++ b/Day11.cs
@@ -2,8 +2,6 @@ using aoc2019.lib;
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Runtime.CompilerServices;
-using System.Text;
 
 namespace aoc2019
 {
diff --git a/Day2.cs b/Day2.cs
index f474c45..7856174 100644
--- a/Day2.cs
+++ b/Day2.cs
@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 
 namespace aoc2019
diff --git a/Day3.cs b/Day3.cs
index 442c58a..9049b7a 100644
--- a/Day3.cs
+++ b/Day3.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 
 namespace aoc2019
diff --git a/Day4.cs b/Day4.cs
index fad209d..5a453e0 100644
--- a/Day4.cs
+++ b/Day4.cs
@@ -1,5 +1,4 @@
-using System.IO;
-using System.Linq;
+using System.Linq;
 
 namespace aoc2019
 {
diff --git a/Day5.cs b/Day5.cs
index ecfa14e..f08eec1 100644
--- a/Day5.cs
+++ b/Day5.cs
@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 
 namespace aoc2019
diff --git a/Day7.cs b/Day7.cs
index af66d03..a152ce3 100644
--- a/Day7.cs
+++ b/Day7.cs
@@ -1,5 +1,4 @@
 using aoc2019.lib;
-using System;
 using System.Collections.Generic;
 using System.Linq;
 
diff --git a/Day9.cs b/Day9.cs
index 8f21e3d..56988f6 100644
--- a/Day9.cs
+++ b/Day9.cs
@@ -1,6 +1,4 @@
 using aoc2019.lib;
-using System;
-using System.Collections.Generic;
 using System.Linq;
 
 namespace aoc2019
diff --git a/lib/Extensions.cs b/lib/Extensions.cs
index 3c81f17..312af5d 100644
--- a/lib/Extensions.cs
+++ b/lib/Extensions.cs
@@ -1,5 +1,4 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 
 namespace aoc2019.lib