diff --git a/CHANGELOG.md b/CHANGELOG.md
index b03aa4f..ba66a67 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## 1.0
 
-Compatible with Kimai 1.20.0
+Compatible with Kimai 1.27.0
 
 Initial release.
+
+Technically this is compatible with Kimai 1.20, but Kimai core has some issues with negative durations up until 1.27.0.
diff --git a/composer.json b/composer.json
index 95ad0ed..c19ac4c 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
     ],
     "extra": {
         "kimai": {
-            "require": "1.20",
+            "require": "1.27",
             "name": "DeductionTimeBundle"
         }
     },