diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/build.gradle.kts b/arrow-libs/optics/arrow-optics-ksp-plugin/build.gradle.kts
index 8eb8eb6cb6c..3c68f03ec4f 100644
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/build.gradle.kts
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/build.gradle.kts
@@ -27,6 +27,12 @@ kotlin {
   }
 }
 
+java {
+  toolchain {
+    languageVersion.set(JavaLanguageVersion.of(11))
+  }
+}
+
 apply(from = property("ANIMALSNIFFER_MPP"))
 
 dependencies {
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 80163af526b..7e718d376d1 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -10,7 +10,7 @@ kotlin = "2.0.21"
 kotlinBinaryCompatibilityValidator = "0.16.3"
 kotlinCompileTesting = "0.5.1"
 knit = "0.5.0"
-kspVersion = "2.0.21-1.0.25"
+kspVersion = "2.0.21-1.0.26"
 kotlinxSerialization = "1.7.3"
 mockWebServer = "4.12.0"
 retrofit = "2.11.0"