diff --git a/hdrhistogram-fix-metadata.diff b/hdrhistogram-fix-metadata.diff
new file mode 100644
index 0000000..dfbf4fe
--- /dev/null
+++ b/hdrhistogram-fix-metadata.diff
@@ -0,0 +1,11 @@
+--- hdrhistogram-7.5.4/Cargo.toml	1970-01-01T00:00:01+00:00
++++ hdrhistogram-7.5.4/Cargo.toml	2024-09-21T21:16:07.891291+00:00
+@@ -47,7 +47,7 @@
+ required-features = ["serialization"]
+ 
+ [dependencies.base64]
+-version = "0.21"
++version = "0.22"
+ optional = true
+ 
+ [dependencies.byteorder]
diff --git a/rust-hdrhistogram.spec b/rust-hdrhistogram.spec
index 61dfdb0..c573c6b 100644
--- a/rust-hdrhistogram.spec
+++ b/rust-hdrhistogram.spec
@@ -1,4 +1,4 @@
-# Generated by rust2rpm 25
+# Generated by rust2rpm 26
 # * missing dev-dependencies: ieee754 ^0.2.2, rug ^1.2.0
 %bcond_with check
 %global debug_package %{nil}
@@ -14,6 +14,9 @@ Summary:        Port of HdrHistogram to Rust
 License:        MIT OR Apache-2.0
 URL:            https://crates.io/crates/hdrhistogram
 Source:         %{crates_source}
+# Manually created patch for downstream crate metadata changes
+# * bump base64 dependency from 0.21 to 0.22
+Patch:          hdrhistogram-fix-metadata.diff
 
 BuildRequires:  cargo-rpm-macros >= 24
 
diff --git a/rust2rpm.toml b/rust2rpm.toml
index e4c1660..b2509fe 100644
--- a/rust2rpm.toml
+++ b/rust2rpm.toml
@@ -1,3 +1,8 @@
+[package]
+cargo-toml-patch-comments = [
+    "bump base64 dependency from 0.21 to 0.22",
+]
+
 [tests]
 run = ["none"]
 comments = ["missing dev-dependencies: ieee754 ^0.2.2, rug ^1.2.0"]