diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 30cec6d3..4d07b1a0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
     name: Build and Test
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         scala: [2.13.15, 3.3.3]
         java: [temurin@17]
     runs-on: ${{ matrix.os }}
diff --git a/play-json/src/main/scala/pl/iterators/kebs/playjson/enums/KebsPlayJsonEnums.scala b/play-json/src/main/scala/pl/iterators/kebs/playjson/enums/KebsPlayJsonEnums.scala
index 2e87d19e..6263f9b4 100644
--- a/play-json/src/main/scala/pl/iterators/kebs/playjson/enums/KebsPlayJsonEnums.scala
+++ b/play-json/src/main/scala/pl/iterators/kebs/playjson/enums/KebsPlayJsonEnums.scala
@@ -34,7 +34,7 @@ trait KebsPlayJsonEnums {
 
   implicit def enumEncoderImpl[E](implicit ev: EnumLike[E]): Writes[E] = enumEncoder(ev)
 
-  trait KebsCirceEnumsUppercase {
+  trait KebsPlayJsonEnumsUppercase {
     implicit def enumDecoderImpl[E](implicit ev: EnumLike[E]): Reads[E] =
       uppercaseEnumDecoder(ev)
 
@@ -42,7 +42,7 @@ trait KebsPlayJsonEnums {
       uppercaseEnumEncoder(ev)
   }
 
-  trait KebsCirceEnumsLowercase {
+  trait KebsPlayJsonEnumsLowercase {
     implicit def enumDecoderImpl[E](implicit ev: EnumLike[E]): Reads[E] =
       lowercaseEnumDecoder(ev)
 
diff --git a/play-json/src/main/scala/pl/iterators/kebs/playjson/enums/enums.scala b/play-json/src/main/scala/pl/iterators/kebs/playjson/enums/enums.scala
index fb5b909e..8cfae5cd 100644
--- a/play-json/src/main/scala/pl/iterators/kebs/playjson/enums/enums.scala
+++ b/play-json/src/main/scala/pl/iterators/kebs/playjson/enums/enums.scala
@@ -1,6 +1,6 @@
 package pl.iterators.kebs.playjson
 
 package object enums extends KebsPlayJsonEnums with KebsPlayJsonValueEnums {
-  object uppercase extends KebsCirceEnumsUppercase with KebsPlayJsonValueEnums
-  object lowercase extends KebsCirceEnumsLowercase with KebsPlayJsonValueEnums
+  object uppercase extends KebsPlayJsonEnumsUppercase with KebsPlayJsonValueEnums
+  object lowercase extends KebsPlayJsonEnumsLowercase with KebsPlayJsonValueEnums
 }