diff --git a/packages/api-client/src/schema.ts b/packages/api-client/src/schema.ts
index bae7d97..626e287 100644
--- a/packages/api-client/src/schema.ts
+++ b/packages/api-client/src/schema.ts
@@ -235,6 +235,7 @@ export interface operations {
                     prHeadCommit?: string | null;
                     referenceCommit?: string | null;
                     referenceBranch?: string | null;
+                    parentCommits?: components["schemas"]["Sha1Hash"][] | null;
                     /** @enum {string|null} */
                     mode?: "ci" | "monitoring" | null;
                     ciProvider?: string | null;
diff --git a/packages/core/src/ci-environment/git.ts b/packages/core/src/ci-environment/git.ts
index 07c2955..f08fe81 100644
--- a/packages/core/src/ci-environment/git.ts
+++ b/packages/core/src/ci-environment/git.ts
@@ -69,7 +69,7 @@ export function getMergeBaseCommitSha(input: {
   base: string;
   head: string;
 }): string | null {
-  let depth = 50;
+  let depth = 200;
   while (depth < 1000) {
     const mergeBase = getMergeBaseCommitShaWithDepth({
       depth,
@@ -78,7 +78,18 @@ export function getMergeBaseCommitSha(input: {
     if (mergeBase) {
       return mergeBase;
     }
-    depth += 50;
+    depth += 200;
   }
   return null;
 }
+
+export function listParentCommits(input: { sha: string }): string[] | null {
+  try {
+    execSync(`git fetch --depth=200 origin ${input.sha}`);
+    const raw = execSync(`git log --format="%H" --max-count=200 ${input.sha}`);
+    const shas = raw.toString().trim().split("\n");
+    return shas;
+  } catch {
+    return null;
+  }
+}
diff --git a/packages/core/src/ci-environment/index.ts b/packages/core/src/ci-environment/index.ts
index 23ffaa5..d3b9d24 100644
--- a/packages/core/src/ci-environment/index.ts
+++ b/packages/core/src/ci-environment/index.ts
@@ -53,6 +53,17 @@ export function getMergeBaseCommitSha(input: {
   return service.getMergeBaseCommitSha(input, context);
 }
 
+/**
+ * Get the merge base commit.
+ */
+export function listParentCommits(input: { sha: string }): string[] | null {
+  const context = createContext();
+  const service = getCiService(context);
+  if (!service) {
+    return null;
+  }
+  return service.listParentCommits(input, context);
+}
 /**
  * Get the CI environment.
  */
diff --git a/packages/core/src/ci-environment/services/bitrise.ts b/packages/core/src/ci-environment/services/bitrise.ts
index d6acd7d..eccd02b 100644
--- a/packages/core/src/ci-environment/services/bitrise.ts
+++ b/packages/core/src/ci-environment/services/bitrise.ts
@@ -1,4 +1,4 @@
-import { getMergeBaseCommitSha } from "../git";
+import { getMergeBaseCommitSha, listParentCommits } from "../git";
 import type { Service, Context } from "../types";
 
 const getPrNumber = ({ env }: Context) => {
@@ -20,10 +20,12 @@ const service: Service = {
       runAttempt: null,
       prNumber: getPrNumber({ env }),
       prHeadCommit: null,
+      prBaseBranch: null,
       nonce: env.BITRISEIO_PIPELINE_ID || null,
     };
   },
   getMergeBaseCommitSha,
+  listParentCommits,
 };
 
 export default service;
diff --git a/packages/core/src/ci-environment/services/buildkite.ts b/packages/core/src/ci-environment/services/buildkite.ts
index bb553f1..f487328 100644
--- a/packages/core/src/ci-environment/services/buildkite.ts
+++ b/packages/core/src/ci-environment/services/buildkite.ts
@@ -1,5 +1,5 @@
 import type { Service } from "../types";
-import { head, branch, getMergeBaseCommitSha } from "../git";
+import { head, branch, getMergeBaseCommitSha, listParentCommits } from "../git";
 
 const service: Service = {
   name: "Buildkite",
@@ -19,10 +19,12 @@ const service: Service = {
         ? Number(env.BUILDKITE_PULL_REQUEST)
         : null,
       prHeadCommit: null,
+      prBaseBranch: null,
       nonce: env.BUILDKITE_BUILD_ID || null,
     };
   },
   getMergeBaseCommitSha,
+  listParentCommits,
 };
 
 export default service;
diff --git a/packages/core/src/ci-environment/services/circleci.ts b/packages/core/src/ci-environment/services/circleci.ts
index 1ef7ccb..37b8cf4 100644
--- a/packages/core/src/ci-environment/services/circleci.ts
+++ b/packages/core/src/ci-environment/services/circleci.ts
@@ -1,4 +1,4 @@
-import { getMergeBaseCommitSha } from "../git";
+import { getMergeBaseCommitSha, listParentCommits } from "../git";
 import type { Service, Context } from "../types";
 
 const getPrNumber = ({ env }: Context) => {
@@ -26,10 +26,12 @@ const service: Service = {
       runAttempt: null,
       prNumber: getPrNumber({ env }),
       prHeadCommit: null,
+      prBaseBranch: null,
       nonce: env.CIRCLE_WORKFLOW_ID || env.CIRCLE_BUILD_NUM || null,
     };
   },
   getMergeBaseCommitSha,
+  listParentCommits,
 };
 
 export default service;
diff --git a/packages/core/src/ci-environment/services/git.ts b/packages/core/src/ci-environment/services/git.ts
index 6d77ed3..e305f53 100644
--- a/packages/core/src/ci-environment/services/git.ts
+++ b/packages/core/src/ci-environment/services/git.ts
@@ -4,6 +4,7 @@ import {
   branch,
   checkIsGitRepository,
   getMergeBaseCommitSha,
+  listParentCommits,
 } from "../git";
 
 const service: Service = {
@@ -21,10 +22,12 @@ const service: Service = {
       runAttempt: null,
       prNumber: null,
       prHeadCommit: null,
+      prBaseBranch: null,
       nonce: null,
     };
   },
   getMergeBaseCommitSha,
+  listParentCommits,
 };
 
 export default service;
diff --git a/packages/core/src/ci-environment/services/github-actions.ts b/packages/core/src/ci-environment/services/github-actions.ts
index 5169d1c..3596ec1 100644
--- a/packages/core/src/ci-environment/services/github-actions.ts
+++ b/packages/core/src/ci-environment/services/github-actions.ts
@@ -2,7 +2,7 @@ import { existsSync, readFileSync } from "node:fs";
 import type { Service, Context } from "../types";
 import axios from "axios";
 import { debug } from "../../debug";
-import { getMergeBaseCommitSha } from "../git";
+import { getMergeBaseCommitSha, listParentCommits } from "../git";
 
 type EventPayload = {
   pull_request?: {
@@ -10,6 +10,10 @@ type EventPayload = {
       sha: string;
       ref: string;
     };
+    base: {
+      sha: string;
+      ref: string;
+    };
     number: number;
   };
   deployment?: {
@@ -159,6 +163,7 @@ const service: Service = {
         branch: pullRequest?.head.ref || payload.deployment.environment || null,
         prNumber: pullRequest?.number || null,
         prHeadCommit: pullRequest?.head.sha || null,
+        prBaseBranch: null,
       };
     }
 
@@ -168,9 +173,11 @@ const service: Service = {
         payload?.pull_request?.head.ref || getBranch(context, payload) || null,
       prNumber: payload?.pull_request?.number || null,
       prHeadCommit: payload?.pull_request?.head.sha ?? null,
+      prBaseBranch: payload?.pull_request?.base.ref ?? null,
     };
   },
   getMergeBaseCommitSha,
+  listParentCommits,
 };
 
 export default service;
diff --git a/packages/core/src/ci-environment/services/gitlab.ts b/packages/core/src/ci-environment/services/gitlab.ts
index 51a04fe..a06fb4d 100644
--- a/packages/core/src/ci-environment/services/gitlab.ts
+++ b/packages/core/src/ci-environment/services/gitlab.ts
@@ -1,4 +1,4 @@
-import { getMergeBaseCommitSha } from "../git";
+import { getMergeBaseCommitSha, listParentCommits } from "../git";
 import type { Service } from "../types";
 
 const service: Service = {
@@ -16,10 +16,12 @@ const service: Service = {
       runAttempt: null,
       prNumber: null,
       prHeadCommit: null,
+      prBaseBranch: null,
       nonce: env.CI_PIPELINE_ID || null,
     };
   },
   getMergeBaseCommitSha,
+  listParentCommits,
 };
 
 export default service;
diff --git a/packages/core/src/ci-environment/services/heroku.ts b/packages/core/src/ci-environment/services/heroku.ts
index c98cd3b..3b21208 100644
--- a/packages/core/src/ci-environment/services/heroku.ts
+++ b/packages/core/src/ci-environment/services/heroku.ts
@@ -1,5 +1,5 @@
 import type { Service } from "../types";
-import { getMergeBaseCommitSha } from "../git";
+import { getMergeBaseCommitSha, listParentCommits } from "../git";
 
 const service: Service = {
   name: "Heroku",
@@ -15,9 +15,11 @@ const service: Service = {
     runAttempt: null,
     prNumber: null,
     prHeadCommit: null,
+    prBaseBranch: null,
     nonce: env.HEROKU_TEST_RUN_ID || null,
   }),
   getMergeBaseCommitSha,
+  listParentCommits,
 };
 
 export default service;
diff --git a/packages/core/src/ci-environment/services/travis.ts b/packages/core/src/ci-environment/services/travis.ts
index 798a91d..fe767b3 100644
--- a/packages/core/src/ci-environment/services/travis.ts
+++ b/packages/core/src/ci-environment/services/travis.ts
@@ -1,5 +1,5 @@
 import type { Context, Service } from "../types";
-import { getMergeBaseCommitSha } from "../git";
+import { getMergeBaseCommitSha, listParentCommits } from "../git";
 
 const getOwner = ({ env }: Context) => {
   if (!env.TRAVIS_REPO_SLUG) return null;
@@ -33,10 +33,12 @@ const service: Service = {
       runAttempt: null,
       prNumber: getPrNumber(ctx),
       prHeadCommit: null,
+      prBaseBranch: null,
       nonce: env.TRAVIS_BUILD_ID || null,
     };
   },
   getMergeBaseCommitSha,
+  listParentCommits,
 };
 
 export default service;
diff --git a/packages/core/src/ci-environment/types.ts b/packages/core/src/ci-environment/types.ts
index a630d0e..bae67a3 100644
--- a/packages/core/src/ci-environment/types.ts
+++ b/packages/core/src/ci-environment/types.ts
@@ -62,6 +62,11 @@ export interface CiEnvironment {
    */
   prHeadCommit: string | null;
 
+  /**
+   * The branch name that the pull request is targeting.
+   */
+  prBaseBranch: string | null;
+
   /**
    * A unique string for each run of a particular workflow in a repository.
    */
@@ -82,4 +87,10 @@ export interface Service {
     },
     ctx: Context,
   ): string | null;
+  listParentCommits(
+    input: {
+      sha: string;
+    },
+    ctx: Context,
+  ): string[] | null;
 }
diff --git a/packages/core/src/config.ts b/packages/core/src/config.ts
index 8879afd..a5ad43c 100644
--- a/packages/core/src/config.ts
+++ b/packages/core/src/config.ts
@@ -85,6 +85,12 @@ const schema = {
     default: null,
     nullable: true,
   },
+  prBaseBranch: {
+    env: "ARGOS_PR_BASE_BRANCH",
+    format: String,
+    default: null,
+    nullable: true,
+  },
   parallel: {
     env: "ARGOS_PARALLEL",
     default: false,
@@ -177,6 +183,7 @@ export interface Config {
   runAttempt: number | null;
   prNumber: number | null;
   prHeadCommit: string | null;
+  prBaseBranch: string | null;
   mode: "ci" | "monitoring" | null;
   ciProvider: string | null;
   threshold: number | null;
@@ -202,6 +209,7 @@ export async function readConfig(options: Partial<Config> = {}) {
     prNumber:
       options.prNumber || config.get("prNumber") || ciEnv?.prNumber || null,
     prHeadCommit: config.get("prHeadCommit") || ciEnv?.prHeadCommit || null,
+    prBaseBranch: config.get("prBaseBranch") || ciEnv?.prBaseBranch || null,
     referenceBranch:
       options.referenceBranch || config.get("referenceBranch") || null,
     referenceCommit:
diff --git a/packages/core/src/upload.ts b/packages/core/src/upload.ts
index eb247ef..18c77a2 100644
--- a/packages/core/src/upload.ts
+++ b/packages/core/src/upload.ts
@@ -13,7 +13,7 @@ import { debug, debugTime, debugTimeEnd } from "./debug";
 import { chunk } from "./util/chunk";
 import { getPlaywrightTracePath, readMetadata } from "@argos-ci/util";
 import { getArgosCoreSDKIdentifier } from "./version";
-import { getMergeBaseCommitSha } from "./ci-environment";
+import { getMergeBaseCommitSha, listParentCommits } from "./ci-environment";
 
 /**
  * Size of the chunks used to upload screenshots to Argos.
@@ -213,30 +213,56 @@ export async function upload(params: UploadParameters) {
   if (projectResponse.error) {
     throwAPIError(projectResponse.error);
   }
+  debug("Project fetched", projectResponse.data);
+
   const { defaultBaseBranch, hasRemoteContentAccess } = projectResponse.data;
-  const referenceBranch = config.referenceBranch || defaultBaseBranch;
+
   const referenceCommit = (() => {
     if (config.referenceCommit) {
       debug("Found reference commit in config", config.referenceCommit);
       return config.referenceCommit;
     }
 
+    // If we have remote access, we will fetch it from the Git Provider.
     if (hasRemoteContentAccess) {
       return null;
     }
 
-    const sha = getMergeBaseCommitSha({
-      base: referenceBranch,
-      head: config.branch,
-    });
+    // We use the pull request as base branch if possible
+    // else branch specified by the user or the default branch.
+    const base =
+      config.referenceBranch || config.prBaseBranch || defaultBaseBranch;
+
+    const sha = getMergeBaseCommitSha({ base, head: config.branch });
+
     if (sha) {
-      debug("Found reference commit from git", sha);
+      debug("Found merge base", sha);
     } else {
-      debug("No reference commit found in git");
+      debug("No merge base found");
     }
+
     return sha;
   })();
 
+  const parentCommits = (() => {
+    // If we have remote access, we will fetch them from the Git Provider.
+    if (hasRemoteContentAccess) {
+      return null;
+    }
+
+    if (referenceCommit) {
+      const commits = listParentCommits({ sha: referenceCommit });
+      if (commits) {
+        debug("Found parent commits", commits);
+      } else {
+        debug("No parent commits found");
+      }
+      return commits;
+    }
+
+    return null;
+  })();
+
   // Create build
   debug("Creating build");
   const [pwTraceKeys, screenshotKeys] = screenshots.reduce(
@@ -267,8 +293,9 @@ export async function upload(params: UploadParameters) {
       pwTraceKeys,
       prNumber: config.prNumber,
       prHeadCommit: config.prHeadCommit,
-      referenceBranch,
+      referenceBranch: config.referenceBranch,
       referenceCommit,
+      parentCommits,
       argosSdk,
       ciProvider: config.ciProvider,
       runId: config.runId,