diff --git a/requirements/constraints.txt b/requirements/constraints.txt
index 16b12e98e7..c83fb5ff99 100644
--- a/requirements/constraints.txt
+++ b/requirements/constraints.txt
@@ -107,3 +107,5 @@ wrapt==1.11.*
 # zipp 2.0.0 requires Python >= 3.6
 zipp==1.0.0
 
+# Matplotlib 3.1 requires Python 3.6
+matplotlib<3.1
diff --git a/requirements/edx-sandbox/base.in b/requirements/edx-sandbox/base.in
index 12f8ebe560..5eb09df196 100644
--- a/requirements/edx-sandbox/base.in
+++ b/requirements/edx-sandbox/base.in
@@ -18,11 +18,11 @@
 -r shared.txt                       # Dependencies in common with LMS and Studio
 chem                                # A helper library for chemistry calculations
 matplotlib==2.2.4                   # 2D plotting library
-numpy==1.7.2                        # Numeric array processing utilities; used by scipy
+numpy==1.16.5                       # Numeric array processing utilities; used by scipy
 pyparsing==2.2.0                    # Python Parsing module
 random2                             # Implementation of random module that works identically under Python 2 and 3
-scipy==0.14.0                       # Math, science, and engineering library
-sympy==0.7.1                        # Symbolic math library
+scipy==1.2.1                        # Math, science, and engineering library
+sympy==1.4                          # Symbolic math library
 git+https://github.com/edx/openedx-calc.git@e9b698c85ad1152002bc0868f475f153dce88952#egg=calc==0.4
 
 # Install these packages from the edx-platform working tree