diff --git a/src/adapter/outbound/persistence-jpa/src/main/java/dev/caskeleton/adapter/outbound/persistence/techlog/management/JdbcProjectRepositoryAdapter.java b/src/adapter/outbound/persistence-jpa/src/main/java/dev/caskeleton/adapter/outbound/persistence/techlog/management/JdbcProjectRepositoryAdapter.java
index 1dec277..2da8aad 100644
--- a/src/adapter/outbound/persistence-jpa/src/main/java/dev/caskeleton/adapter/outbound/persistence/techlog/management/JdbcProjectRepositoryAdapter.java
+++ b/src/adapter/outbound/persistence-jpa/src/main/java/dev/caskeleton/adapter/outbound/persistence/techlog/management/JdbcProjectRepositoryAdapter.java
@@ -216,7 +216,7 @@ public class JdbcProjectRepositoryAdapter implements ProjectRepositoryPort {
         jdbcClient
             .sql(
                 "SELECT EXISTS (SELECT 1 FROM project WHERE slug = :slug"
-                    + " AND (:except IS NULL OR id <> :except))")
+                    + " AND (CAST(:except AS uuid) IS NULL OR id <> CAST(:except AS uuid)))")
             .param("slug", slug)
             .param("except", exceptId)
             .query(Boolean.class)
diff --git a/src/adapter/outbound/persistence-jpa/src/main/java/dev/caskeleton/adapter/outbound/persistence/techlog/management/JdbcTopicRepositoryAdapter.java b/src/adapter/outbound/persistence-jpa/src/main/java/dev/caskeleton/adapter/outbound/persistence/techlog/management/JdbcTopicRepositoryAdapter.java
index ce13ac1..647d90a 100644
--- a/src/adapter/outbound/persistence-jpa/src/main/java/dev/caskeleton/adapter/outbound/persistence/techlog/management/JdbcTopicRepositoryAdapter.java
+++ b/src/adapter/outbound/persistence-jpa/src/main/java/dev/caskeleton/adapter/outbound/persistence/techlog/management/JdbcTopicRepositoryAdapter.java
@@ -143,7 +143,7 @@ public class JdbcTopicRepositoryAdapter implements TopicRepositoryPort {
         jdbcClient
             .sql(
                 "SELECT EXISTS (SELECT 1 FROM topic WHERE normalized_name = :name"
-                    + " AND (:except IS NULL OR id <> :except))")
+                    + " AND (CAST(:except AS uuid) IS NULL OR id <> CAST(:except AS uuid)))")
             .param("name", normalizedName)
             .param("except", exceptId)
             .query(Boolean.class)
@@ -156,7 +156,7 @@ public class JdbcTopicRepositoryAdapter implements TopicRepositoryPort {
         jdbcClient
             .sql(
                 "SELECT EXISTS (SELECT 1 FROM topic WHERE slug = :slug"
-                    + " AND (:except IS NULL OR id <> :except))")
+                    + " AND (CAST(:except AS uuid) IS NULL OR id <> CAST(:except AS uuid)))")
             .param("slug", slug)
             .param("except", exceptId)
             .query(Boolean.class)