diff --git a/build.gradle b/build.gradle
index 66e911e3..d5bae205 100644
--- a/build.gradle
+++ b/build.gradle
@@ -86,6 +86,9 @@ allprojects {
     dependencies {
         constraints {
             implementation(libs.fulmicollection) {
+                version {
+                    reject '1.7', '1.6.6', '1.6.5', '1.6.4'
+                }
                 because 'newer versions have unresolved bugs'
             }
         }
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 753699e2..41917ea0 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -3,7 +3,7 @@ delombok = "8.11"
 groovy = "4.0.24"
 
 # Latest versions
-fulmicollection = "1.6.1"
+fulmicollection = "1.6.3"
 yamlparser = "latest.release"
 
 spigot = "1.14-R0.1-SNAPSHOT"