diff --git a/buildSrc/src/main/kotlin/kotlin-conventions.gradle.kts b/buildSrc/src/main/kotlin/kotlin-conventions.gradle.kts
index 27253dc..06f52a3 100644
--- a/buildSrc/src/main/kotlin/kotlin-conventions.gradle.kts
+++ b/buildSrc/src/main/kotlin/kotlin-conventions.gradle.kts
@@ -30,6 +30,7 @@ tasks.withType<KotlinCompile> {
         jvmTarget = "11"
         languageVersion = "1.6"
         apiVersion = "1.6"
+        freeCompilerArgs += "-opt-in=kotlin.RequiresOptIn"
     }
 }
 
diff --git a/model/src/main/kotlin/com/toasttab/expediter/issue/IssueReport.kt b/model/src/main/kotlin/com/toasttab/expediter/issue/IssueReport.kt
index f3fc13c..cfa0ea8 100644
--- a/model/src/main/kotlin/com/toasttab/expediter/issue/IssueReport.kt
+++ b/model/src/main/kotlin/com/toasttab/expediter/issue/IssueReport.kt
@@ -15,6 +15,7 @@
 
 package com.toasttab.expediter.issue
 
+import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
@@ -34,9 +35,13 @@ class IssueReport(
         }
 
         fun fromJson(string: String) = JSON.decodeFromString<IssueReport>(string)
+
+        @OptIn(ExperimentalSerializationApi::class)
         fun fromJson(stream: InputStream) = JSON.decodeFromStream<IssueReport>(stream)
     }
 
     fun toJson() = JSON.encodeToString(this)
+
+    @OptIn(ExperimentalSerializationApi::class)
     fun toJson(stream: OutputStream) = JSON.encodeToStream(this, stream)
 }
diff --git a/plugin/src/main/kotlin/com/toasttab/expediter/gradle/ExpediterPlugin.kt b/plugin/src/main/kotlin/com/toasttab/expediter/gradle/ExpediterPlugin.kt
index 96a4d58..35916dd 100644
--- a/plugin/src/main/kotlin/com/toasttab/expediter/gradle/ExpediterPlugin.kt
+++ b/plugin/src/main/kotlin/com/toasttab/expediter/gradle/ExpediterPlugin.kt
@@ -73,6 +73,7 @@ class ExpediterPlugin : Plugin<Project> {
 
             ignore = extension.ignoreSpec.buildIgnore()
 
+            @Suppress("DEPRECATION")
             ignoreFile = (extension.ignoreSpec.file ?: extension.ignoreFile)?.let { project.file(it) }
 
             report = project.layout.buildDirectory.file("expediter.json").get().asFile