diff --git a/src/core/project.js b/src/core/project.js
index 6619aea..ca62dbb 100644
--- a/src/core/project.js
+++ b/src/core/project.js
@@ -88,8 +88,8 @@ export function encodeProjectId(id: ProjectId): string {
 }
 
 const upgradeFrom051 = (p: ProjectV051): ProjectV052 => ({
-  ...p,
   discord: null,
+  ...p,
 });
 
 export type ProjectV051 = {|
@@ -103,8 +103,8 @@ export type ProjectV051 = {|
 
 const upgradeFrom050 = (p: ProjectV050) =>
   upgradeFrom051({
-    ...p,
     timelineCredParams: {},
+    ...p,
   });
 
 export type ProjectV050 = {|
@@ -117,8 +117,8 @@ export type ProjectV050 = {|
 
 const upgradeFrom040 = (p: ProjectV040) =>
   upgradeFrom050({
-    ...p,
     initiatives: null,
+    ...p,
   });
 
 export type ProjectV040 = {|
diff --git a/src/core/project.test.js b/src/core/project.test.js
index 7515c1d..6a35865 100644
--- a/src/core/project.test.js
+++ b/src/core/project.test.js
@@ -15,7 +15,7 @@ import {
 
 import {makeRepoId} from "../plugins/github/repoId";
 import {toCompat} from "../util/compat";
-import type {ProjectV050, ProjectV051} from "./project";
+import type {ProjectV050, ProjectV051, ProjectV052} from "./project";
 
 describe("core/project", () => {
   const foobar = deepFreeze(makeRepoId("foo", "bar"));
@@ -173,7 +173,7 @@ describe("core/project", () => {
   it("should upgrade from 0.5.1 formatting", () => {
     // Given
     const body: ProjectV051 = {
-      id: "example-050",
+      id: "example-051",
       repoIds: [foobar, foozod],
       discourseServer: {serverUrl: "https://example.com"},
       identities: [],
@@ -196,6 +196,33 @@ describe("core/project", () => {
       }: Project)
     );
   });
+
+  it("should upgrade from 0.5.0 formatting without overwriting fields", () => {
+    // Given
+    const body: ProjectV052 = {
+      id: "example-051",
+      repoIds: [foobar, foozod],
+      discourseServer: {serverUrl: "https://example.com"},
+      identities: [],
+      initiatives: null,
+      timelineCredParams: {alpha: 0.2, intervalDecay: 0.5},
+      discord: {guildId: "1234", reactionWeights: {}},
+    };
+    const compat = toCompat(
+      {type: "sourcecred/project", version: "0.5.0"},
+      body
+    );
+
+    // When
+    const project = projectFromJSON(compat);
+
+    // Then
+    expect(project).toEqual(
+      ({
+        ...body,
+      }: Project)
+    );
+  });
   describe("encodeProjectId", () => {
     it("is a base64-url encoded id", () => {
       const project = {id: "foo bar", repoIds: []};