diff --git a/.travis.yml b/.travis.yml
index 7781a79..18abd16 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -95,8 +95,8 @@ env:
   global:
     # TWINE_PASSWORD
     - secure: "WjxnZjhgG7SCFbtYNbCAv935y3GG1CBHKJZbjSag9dBNg41OF98Q4PjnK6KxQ68Avfsv8mTGn8FbbGyXU4J033khynMCDOPMo0MAKPVYTaon3GKXf9triyzuuFty5U0kydJyqQdiqpkJPgkOou19s/x1AesfBthUswS51kyWdeg="
-    - MEDIAINFO_VERSION: 20.09
-    - LIBZEN_VERSION: 0.4.38
+    - MEDIAINFO_VERSION: 21.03
+    - LIBZEN_VERSION: 0.4.39
     - UBUNTU_VERSION: 18.04
     - PYTHON_MAIN_VERSION: *python_main_version
     - TOX_PARALLEL_NO_SPINNER: 1
diff --git a/appveyor.yml b/appveyor.yml
index 69c1060..28d7b7a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -4,7 +4,7 @@ image:
 environment:
   # Work around https://github.com/tox-dev/tox/issues/1550
   PYTHONIOENCODING: utf-8
-  MEDIAINFO_VERSION: 20.09
+  MEDIAINFO_VERSION: 21.03
   TWINE_PASSWORD:
     secure: /EO8CxTxhQVNsGNZZvU51jjHwPW524rgddNlwOAyLoA=
   matrix: