diff --git a/y2018/control_loops/python/BUILD b/y2018/control_loops/python/BUILD
index 1f29601..3c75b97 100644
--- a/y2018/control_loops/python/BUILD
+++ b/y2018/control_loops/python/BUILD
@@ -94,7 +94,7 @@
         "//external:python-gflags",
         "//external:python-glog",
         "//frc971/control_loops/python:controls",
-        "@matplotlib_repo//:matplotlib2.7",
+        "@matplotlib_repo//:matplotlib3",
     ],
 )
 
diff --git a/y2018/control_loops/python/arm_trajectory.py b/y2018/control_loops/python/arm_trajectory.py
index 3531dc7..bcfd9f0 100755
--- a/y2018/control_loops/python/arm_trajectory.py
+++ b/y2018/control_loops/python/arm_trajectory.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 import copy
 import numpy
diff --git a/y2018/control_loops/python/drivetrain.py b/y2018/control_loops/python/drivetrain.py
index 177e9e7..675930a 100644
--- a/y2018/control_loops/python/drivetrain.py
+++ b/y2018/control_loops/python/drivetrain.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 from __future__ import print_function
 from frc971.control_loops.python import drivetrain
diff --git a/y2018/control_loops/python/extended_lqr.py b/y2018/control_loops/python/extended_lqr.py
index 3c8d0e6..4eecee9 100755
--- a/y2018/control_loops/python/extended_lqr.py
+++ b/y2018/control_loops/python/extended_lqr.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # This is an initial, hacky implementation of the extended LQR paper. It's just
 # a proof of concept, so don't trust it too much.
 
diff --git a/y2018/control_loops/python/intake.py b/y2018/control_loops/python/intake.py
index 3802505..00f737b 100755
--- a/y2018/control_loops/python/intake.py
+++ b/y2018/control_loops/python/intake.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 from frc971.control_loops.python import control_loop
 from frc971.control_loops.python import controls
diff --git a/y2018/control_loops/python/path_points.py b/y2018/control_loops/python/path_points.py
index 319853c..eed9804 100644
--- a/y2018/control_loops/python/path_points.py
+++ b/y2018/control_loops/python/path_points.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 # Path points from Parker.
 # Points in (theta0, theta1) of the boundry of the safe region.
diff --git a/y2018/control_loops/python/polydrivetrain.py b/y2018/control_loops/python/polydrivetrain.py
index 1652b99..c92e432 100644
--- a/y2018/control_loops/python/polydrivetrain.py
+++ b/y2018/control_loops/python/polydrivetrain.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 import sys
 from y2018.control_loops.python import drivetrain
diff --git a/y2018/control_loops/python/polydrivetrain_test.py b/y2018/control_loops/python/polydrivetrain_test.py
index 02018d3..ccc3b77 100644
--- a/y2018/control_loops/python/polydrivetrain_test.py
+++ b/y2018/control_loops/python/polydrivetrain_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 from frc971.control_loops.python import polydrivetrain
 import numpy
diff --git a/y2018/control_loops/python/spline_generate.py b/y2018/control_loops/python/spline_generate.py
index 4376f37..cea3d7e 100644
--- a/y2018/control_loops/python/spline_generate.py
+++ b/y2018/control_loops/python/spline_generate.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 import numpy as np
 import matplotlib.pyplot as plt
 from frc971.control_loops.python import drivetrain