diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88ab778..70a3157 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## [1.7.3](https://github.com/korlibs/klock/compare/1.7.2...1.7.3)
+
+* Fixed InvalidMutabilityException issues [#64](https://github.com/korlibs/klock/issues/64)
+
 ## [1.7.2](https://github.com/korlibs/klock/compare/1.7.1...1.7.2)
 
 * Support optional format parts [#27](https://github.com/korlibs/klock/issues/27)
diff --git a/README.md b/README.md
index bd50fac..4148a86 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ val daysInNextMonth = (now.yearMonth + 1.months).days
 Starting with Klock 1.4.0, the library is available at jcenter.
 
 ```groovy
-def klockVersion = "1.7.2"
+def klockVersion = "1.7.3"
 
 repositories {
     jcenter()
@@ -55,7 +55,7 @@ enableFeaturePreview('GRADLE_METADATA')
 ### Use with Kotlin-JVM
 
 ```groovy
-def klockVersion = "1.7.2"
+def klockVersion = "1.7.3"
 
 repositories {
     jcenter()