diff --git a/requirements/edx/coverage.txt b/requirements/edx/coverage.txt
index ea5df00569..bd2cbf10d0 100644
--- a/requirements/edx/coverage.txt
+++ b/requirements/edx/coverage.txt
@@ -8,7 +8,7 @@ chardet==5.2.0
     # via diff-cover
 coverage==7.4.1
     # via -r requirements/edx/coverage.in
-diff-cover==8.0.3
+diff-cover==9.0.0
     # via -r requirements/edx/coverage.in
 jinja2==3.1.3
     # via diff-cover
diff --git a/requirements/edx/development.txt b/requirements/edx/development.txt
index ba9ba7b061..4521230fd9 100644
--- a/requirements/edx/development.txt
+++ b/requirements/edx/development.txt
@@ -331,7 +331,7 @@ defusedxml==0.7.1
     #   ora2
     #   python3-openid
     #   social-auth-core
-diff-cover==8.0.3
+diff-cover==9.0.0
     # via -r requirements/edx/testing.txt
 dill==0.3.8
     # via
diff --git a/requirements/edx/testing.txt b/requirements/edx/testing.txt
index e5b587cc08..ead2303c1f 100644
--- a/requirements/edx/testing.txt
+++ b/requirements/edx/testing.txt
@@ -250,7 +250,7 @@ defusedxml==0.7.1
     #   ora2
     #   python3-openid
     #   social-auth-core
-diff-cover==8.0.3
+diff-cover==9.0.0
     # via -r requirements/edx/coverage.txt
 dill==0.3.8
     # via pylint