diff --git a/History.md b/History.md
index a278417..5e808e3 100644
--- a/History.md
+++ b/History.md
@@ -1,5 +1,12 @@
 # `rake-compiler/rake-compiler-dock` Changelog
 
+## 1.5.1 / 2024-06-03
+
+### Improvements
+
+The `x86_64-linux-gnu` and `x86-linux-gnu` containers (based on `manylinux_2014`) now have a modern version of `pkg-config`, v0.29.2, installed on them in `/usr/local/bin/pkg-config`. The distro's version (v0.27.1) is still in `/usr/bin/pkg-config` if you need to fall back for some reason, but the newer version will be used by default and should be backwards-compatible. (#121, #123 by @flavorjones)
+
+
 ## 1.5.0 / 2024-02-25
 
 ### Notable changes
diff --git a/lib/rake_compiler_dock/version.rb b/lib/rake_compiler_dock/version.rb
index 55a255a..0d63fa4 100644
--- a/lib/rake_compiler_dock/version.rb
+++ b/lib/rake_compiler_dock/version.rb
@@ -1,4 +1,4 @@
 module RakeCompilerDock
-  VERSION = "1.5.1.dev"
-  IMAGE_VERSION = "1.5.1.dev"
+  VERSION = "1.5.1"
+  IMAGE_VERSION = "1.5.1"
 end