diff --git a/baseline-error-prone/src/main/java/com/palantir/baseline/errorprone/ProxyNonConstantType.java b/baseline-error-prone/src/main/java/com/palantir/baseline/errorprone/ProxyNonConstantType.java
index f6abdd29f..a80585fae 100644
--- a/baseline-error-prone/src/main/java/com/palantir/baseline/errorprone/ProxyNonConstantType.java
+++ b/baseline-error-prone/src/main/java/com/palantir/baseline/errorprone/ProxyNonConstantType.java
@@ -38,7 +38,7 @@
         name = "ProxyNonConstantType",
         link = "https://github.com/palantir/gradle-baseline#baseline-error-prone-checks",
         linkType = LinkType.CUSTOM,
-        severity = SeverityLevel.SUGGESTION,
+        severity = SeverityLevel.WARNING,
         summary = "Proxy instances should be created using constant types known at compile time to allow native-image "
                 + "behavior to match hotspot. Methods which build proxies should take a "
                 + "`Function<InvocationHandler, ? extends T>` instead of arbitrary class references. "
diff --git a/changelog/@unreleased/pr-1816.v2.yml b/changelog/@unreleased/pr-1816.v2.yml
new file mode 100644
index 000000000..6af1414e3
--- /dev/null
+++ b/changelog/@unreleased/pr-1816.v2.yml
@@ -0,0 +1,5 @@
+type: improvement
+improvement:
+  description: Upgrade ProxyNonConstantType to WARNING (from suggestion)
+  links:
+  - https://github.com/palantir/gradle-baseline/pull/1816