diff --git a/CHANGELOG.md b/CHANGELOG.md
index 84c5de2..e592f26 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,13 @@
 ChangeLog
 =========
 
+5.1.1 (2020-09-19)
+------------------
+
+* declare experimental php8 support (@TysonAndre)
+* incorporated psalm types (@staabm)
+* updated build (@phil-davis)
+
 5.1.0 (2020-01-31)
 ------------------
 
diff --git a/lib/Version.php b/lib/Version.php
index e98e2e3..848aee4 100644
--- a/lib/Version.php
+++ b/lib/Version.php
@@ -16,5 +16,5 @@ class Version
     /**
      * Full version number.
      */
-    const VERSION = '5.1.0';
+    const VERSION = '5.1.1';
 }