diff --git a/build.gradle.kts b/build.gradle.kts
index ef09e5edd..98dbd0079 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -163,6 +163,10 @@ allprojects {
             sourceCompatibility = JavaVersion.VERSION_17
             targetCompatibility = JavaVersion.VERSION_17
             withSourcesJar()
+
+            toolchain {
+                languageVersion = JavaLanguageVersion.of(17)
+            }
         }
 
         test {
diff --git a/eco-core/core-nms/nms-common/build.gradle.kts b/eco-core/core-nms/nms-common/build.gradle.kts
index 27a95d2b8..11d4fe3bb 100644
--- a/eco-core/core-nms/nms-common/build.gradle.kts
+++ b/eco-core/core-nms/nms-common/build.gradle.kts
@@ -8,3 +8,9 @@ version = rootProject.version
 dependencies {
     paperweight.paperDevBundle("1.17.1-R0.1-SNAPSHOT")
 }
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
diff --git a/eco-core/core-nms/v1_17_R1/build.gradle.kts b/eco-core/core-nms/v1_17_R1/build.gradle.kts
index b074875ab..893730a3f 100644
--- a/eco-core/core-nms/v1_17_R1/build.gradle.kts
+++ b/eco-core/core-nms/v1_17_R1/build.gradle.kts
@@ -38,3 +38,9 @@ tasks {
         )
     }
 }
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
diff --git a/eco-core/core-nms/v1_18_R1/build.gradle.kts b/eco-core/core-nms/v1_18_R1/build.gradle.kts
index 86c77e6ea..746ee752e 100644
--- a/eco-core/core-nms/v1_18_R1/build.gradle.kts
+++ b/eco-core/core-nms/v1_18_R1/build.gradle.kts
@@ -37,3 +37,9 @@ tasks {
         )
     }
 }
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
diff --git a/eco-core/core-nms/v1_18_R2/build.gradle.kts b/eco-core/core-nms/v1_18_R2/build.gradle.kts
index 7be254fb3..677647fa4 100644
--- a/eco-core/core-nms/v1_18_R2/build.gradle.kts
+++ b/eco-core/core-nms/v1_18_R2/build.gradle.kts
@@ -37,3 +37,9 @@ tasks {
         )
     }
 }
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
diff --git a/eco-core/core-nms/v1_19_R1/build.gradle.kts b/eco-core/core-nms/v1_19_R1/build.gradle.kts
index a38b75d85..b683cb3d5 100644
--- a/eco-core/core-nms/v1_19_R1/build.gradle.kts
+++ b/eco-core/core-nms/v1_19_R1/build.gradle.kts
@@ -37,3 +37,9 @@ tasks {
         )
     }
 }
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}