diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index d1f2ca0..0f3b5de 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -16,8 +16,8 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@v3
         with:
-            java-version: 17
-            distribution: 'temurin'
-            cache: maven
+          java-version: 17
+          distribution: 'temurin'
+          cache: maven
       - name: Build with Maven
         run: mvn --batch-mode --update-snapshots package
\ No newline at end of file
diff --git a/src/main/java/com/litesoftwares/coingecko/domain/Coins/CoinFullData.java b/src/main/java/com/litesoftwares/coingecko/domain/Coins/CoinFullData.java
index ce7577e..7ab91c2 100644
--- a/src/main/java/com/litesoftwares/coingecko/domain/Coins/CoinFullData.java
+++ b/src/main/java/com/litesoftwares/coingecko/domain/Coins/CoinFullData.java
@@ -29,7 +29,7 @@ public class CoinFullData {
     @JsonProperty("hashing_algorithm")
     private String hashingAlgorithm;
     @JsonProperty("categories")
-    private List<Object> categories;
+    private List<String> categories;
     @JsonProperty("public_notice")
     private String publicNotice;
     @JsonProperty("additional_notices")