diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index 4c7b0335e6..729b638c79 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -26,3 +26,8 @@ c4268e3da64f1abb5b31deaeb5769adb6510c0a7
 # Update black to 23.1.0 (https://github.com/matrix-org/synapse/pull/15103)
 9bb2eac71962970d02842bca441f4bcdbbf93a11
 
+# Use type hinting generics in standard collections (https://github.com/element-hq/synapse/pull/19046)
+fc244bb592aa481faf28214a2e2ce3bb4e95d990
+
+# Write union types as X | Y where possible (https://github.com/element-hq/synapse/pull/19111)
+fcac7e0282b074d4bd3414d1c9c181e9701875d9
diff --git a/changelog.d/19150.misc b/changelog.d/19150.misc
new file mode 100644
index 0000000000..a97a487c6c
--- /dev/null
+++ b/changelog.d/19150.misc
@@ -0,0 +1 @@
+Ignore recent Python language refactors from git blame (`.git-blame-ignore-revs`).