diff --git a/testing/web-platform/tests/tools/wptrunner/requirements.txt b/testing/web-platform/tests/tools/wptrunner/requirements.txt
index ba8716263768a..0bda25a135136 100644
--- a/testing/web-platform/tests/tools/wptrunner/requirements.txt
+++ b/testing/web-platform/tests/tools/wptrunner/requirements.txt
@@ -2,7 +2,7 @@ html5lib==1.1
 mozdebug==0.3.0
 mozinfo==1.2.2  # https://bugzilla.mozilla.org/show_bug.cgi?id=1621226
 mozlog==8.0.0
-mozprocess==1.3.0
+mozprocess==1.3.1
 packaging==23.1
 pillow==9.5.0
 requests==2.31.0
diff --git a/testing/web-platform/tests/tools/wptrunner/requirements_ie.txt b/testing/web-platform/tests/tools/wptrunner/requirements_ie.txt
index 788506b4ac3a2..aa272e2bfdd4c 100644
--- a/testing/web-platform/tests/tools/wptrunner/requirements_ie.txt
+++ b/testing/web-platform/tests/tools/wptrunner/requirements_ie.txt
@@ -1,2 +1,2 @@
-mozprocess==1.3.0
+mozprocess==1.3.1
 selenium==4.10.0
diff --git a/testing/web-platform/tests/tools/wptrunner/requirements_opera.txt b/testing/web-platform/tests/tools/wptrunner/requirements_opera.txt
index 788506b4ac3a2..aa272e2bfdd4c 100644
--- a/testing/web-platform/tests/tools/wptrunner/requirements_opera.txt
+++ b/testing/web-platform/tests/tools/wptrunner/requirements_opera.txt
@@ -1,2 +1,2 @@
-mozprocess==1.3.0
+mozprocess==1.3.1
 selenium==4.10.0