diff --git a/requirements/edx-sandbox/base.txt b/requirements/edx-sandbox/base.txt
index 5d2427df3e..241deba480 100644
--- a/requirements/edx-sandbox/base.txt
+++ b/requirements/edx-sandbox/base.txt
@@ -45,8 +45,9 @@ nltk==3.8.1
     # via
     #   -r requirements/edx-sandbox/base.in
     #   chem
-numpy==2.0.0
+numpy==1.26.4
     # via
+    #   -c requirements/edx-sandbox/../constraints.txt
     #   chem
     #   contourpy
     #   matplotlib
diff --git a/requirements/edx/base.txt b/requirements/edx/base.txt
index 78ab026e6f..1259d5bda7 100644
--- a/requirements/edx/base.txt
+++ b/requirements/edx/base.txt
@@ -712,8 +712,9 @@ nltk==3.8.1
     # via chem
 nodeenv==1.9.1
     # via -r requirements/edx/kernel.in
-numpy==2.0.0
+numpy==1.26.4
     # via
+    #   -c requirements/edx/../constraints.txt
     #   chem
     #   openedx-calc
     #   scipy
diff --git a/requirements/edx/development.txt b/requirements/edx/development.txt
index f01cd95f44..f6fa683635 100644
--- a/requirements/edx/development.txt
+++ b/requirements/edx/development.txt
@@ -1235,8 +1235,9 @@ nodeenv==1.9.1
     #   -r requirements/edx/assets.txt
     #   -r requirements/edx/doc.txt
     #   -r requirements/edx/testing.txt
-numpy==2.0.0
+numpy==1.26.4
     # via
+    #   -c requirements/edx/../constraints.txt
     #   -r requirements/edx/doc.txt
     #   -r requirements/edx/testing.txt
     #   chem
diff --git a/requirements/edx/doc.txt b/requirements/edx/doc.txt
index d8f53051a7..3ab0f8ce81 100644
--- a/requirements/edx/doc.txt
+++ b/requirements/edx/doc.txt
@@ -837,8 +837,9 @@ nltk==3.8.1
     #   chem
 nodeenv==1.9.1
     # via -r requirements/edx/base.txt
-numpy==2.0.0
+numpy==1.26.4
     # via
+    #   -c requirements/edx/../constraints.txt
     #   -r requirements/edx/base.txt
     #   chem
     #   openedx-calc
diff --git a/requirements/edx/testing.txt b/requirements/edx/testing.txt
index 08a725530b..9d8c429800 100644
--- a/requirements/edx/testing.txt
+++ b/requirements/edx/testing.txt
@@ -917,8 +917,9 @@ nltk==3.8.1
     #   chem
 nodeenv==1.9.1
     # via -r requirements/edx/base.txt
-numpy==2.0.0
+numpy==1.26.4
     # via
+    #   -c requirements/edx/../constraints.txt
     #   -r requirements/edx/base.txt
     #   chem
     #   openedx-calc