diff --git a/master_changes.md b/master_changes.md
index 6d83c77d0d6..dc765e7aa81 100644
--- a/master_changes.md
+++ b/master_changes.md
@@ -69,6 +69,7 @@ users)
 ## VCS
 
 ## Build
+  * Upgrade vendored cmdliner to 1.2.0 [#5797 @kit-ty-kate]
 
 ## Infrastructure
   * Fix depexts CI workflow and ensure all workflows run on master push [#5788 @dra27]
diff --git a/src_ext/Makefile.sources b/src_ext/Makefile.sources
index 9efc8d7e6c6..75cf4cd32c6 100644
--- a/src_ext/Makefile.sources
+++ b/src_ext/Makefile.sources
@@ -18,8 +18,8 @@ MD5_re = 68c427f8b55507f8b61c613ee6a5b3da
 
 $(call PKG_SAME,re)
 
-URL_cmdliner = https://erratique.ch/software/cmdliner/releases/cmdliner-1.1.1.tbz
-MD5_cmdliner = 26b9af55a7456290b710e1c96a0ca231
+URL_cmdliner = https://erratique.ch/software/cmdliner/releases/cmdliner-1.2.0.tbz
+MD5_cmdliner = b860881cc90c68b703dca0f35bdd4cdb
 
 $(call PKG_SAME,cmdliner)