diff --git a/TODO.md b/TODO.md
index 0507f5c..eab20e5 100644
--- a/TODO.md
+++ b/TODO.md
@@ -3,5 +3,6 @@
 - Write to env?
 - Test with AWS Extension
   - See if this can set AWS Builder ID for AWS Extension
+  - Try to invoke AWS Select Connection afterwards
 - Onboarding experience for brand new user / org
-- Don't rely on the `aws` CLI to update profile
+- Loading progress indicator between inputs
diff --git a/package.json b/package.json
index 7bc3588..09d2318 100644
--- a/package.json
+++ b/package.json
@@ -112,7 +112,9 @@
   },
   "devDependencies": {
     "@scaffoldly/openapi-generator": "^2.0.0",
+    "@types/fs-extra": "^11.0.4",
     "@types/humanize-duration": "^3.27.3",
+    "@types/ini": "^1.3.34",
     "@types/mocha": "^10.0.3",
     "@types/node": "18.x",
     "@types/qrcode-svg": "^1.1.4",
@@ -135,8 +137,10 @@
     "@aws-sdk/client-sts": "^3.458.0",
     "@octokit/rest": "^20.0.2",
     "axios": "^1.6.2",
+    "fs-extra": "^11.2.0",
     "humanize-duration": "^3.31.0",
+    "ini": "^4.1.1",
     "qrcode-svg": "^1.1.0",
     "which": "^4.0.0"
   }
-}
\ No newline at end of file
+}
diff --git a/src/aws.ts b/src/aws.ts
index 2820e05..f620bb0 100644
--- a/src/aws.ts
+++ b/src/aws.ts
@@ -1,11 +1,16 @@
 import * as vscode from "vscode";
+import * as ini from "ini";
 import { ApiFactory } from "./api";
 import { TotpHelper } from "./totp";
 import { AssumeRoleWithSAMLCommand, STSClient } from "@aws-sdk/client-sts";
-import { exec } from "./exec";
+// import { exec } from "./exec";
 import humanizeDuration from "humanize-duration";
 import { AwsRoleSelection, Configuration, ProfileName } from "./config";
 import { isAxiosError } from "axios";
+import { dirname, join } from "path";
+import { mkdirp } from "fs-extra";
+import { fileExists, getHomeDirectory } from "./util";
+import { readFileSync, writeFileSync } from "fs";
 
 export const assumeAwsRole = (
   configuration: Configuration,
@@ -133,14 +138,22 @@ export const assumeAwsRole = (
           configuration.assumeAws.profile.name,
           roleSelection
         );
-        const base = ["aws", "configure"];
-        base.push("--profile", profileName);
-        base.push("set");
 
-        await exec([...base, "region", configuration.assumeAws.region]);
-        await exec([...base, "aws_access_key_id", AccessKeyId]);
-        await exec([...base, "aws_secret_access_key", SecretAccessKey]);
-        await exec([...base, "aws_session_token", SessionToken]);
+        await updateProfile(profileName, {
+          region: configuration.assumeAws.region,
+          accessKeyId: AccessKeyId,
+          secretAccessKey: SecretAccessKey,
+          sessionToken: SessionToken,
+        });
+
+        // const base = ["aws", "configure"];
+        // base.push("--profile", profileName);
+        // base.push("set");
+
+        // await exec([...base, "region", configuration.assumeAws.region]);
+        // await exec([...base, "aws_access_key_id", AccessKeyId]);
+        // await exec([...base, "aws_secret_access_key", SecretAccessKey]);
+        // await exec([...base, "aws_session_token", SessionToken]);
 
         if (!isRefresh) {
           vscode.window.showInformationMessage(
@@ -229,3 +242,91 @@ export const stopRefresh = (apiFactory: ApiFactory): (() => void) => {
     }
   };
 };
+
+const getCredentialsFilename = (): string => {
+  return (
+    process.env.AWS_SHARED_CREDENTIALS_FILE ||
+    join(getHomeDirectory(), ".aws", "credentials")
+  );
+};
+
+const getConfigFilename = (): string => {
+  return (
+    process.env.AWS_CONFIG_FILE || join(getHomeDirectory(), ".aws", "config")
+  );
+};
+
+const getConfigAndCredentials = async (): Promise<{
+  config: { [key: string]: any };
+  configFile: string;
+  credentials: { [key: string]: any };
+  credentialsFile: string;
+}> => {
+  const configFile = getConfigFilename();
+  const credentialsFile = getCredentialsFilename();
+
+  const config = (await fileExists(configFile))
+    ? ini.parse(readFileSync(configFile, "utf-8"))
+    : {};
+
+  const credentials = (await fileExists(credentialsFile))
+    ? ini.parse(readFileSync(credentialsFile, "utf-8"))
+    : {};
+
+  return { config, configFile, credentials, credentialsFile };
+};
+
+const updateProfile = async (
+  profile: string,
+  options: {
+    region: string;
+    accessKeyId: string;
+    secretAccessKey: string;
+    sessionToken: string;
+  }
+): Promise<void> => {
+  const filepath = dirname(getCredentialsFilename());
+  if (!(await fileExists(filepath))) {
+    await mkdirp(filepath);
+  }
+
+  const { config, configFile, credentials, credentialsFile } =
+    await getConfigAndCredentials();
+
+  let section: string | undefined = undefined;
+  let profileHeader = `profile ${profile}`;
+
+  // Prevent escaping of "." in profile name
+  if (profile.indexOf(".") !== -1) {
+    const parts = profile.split(".");
+    profile = parts.pop() || "";
+    profileHeader = profile;
+    section = `profile ${parts.join(".")}`;
+  }
+
+  config[profileHeader] = {
+    region: options.region,
+  };
+
+  credentials[profile] = {
+    aws_access_key_id: options.accessKeyId,
+    aws_secret_access_key: options.secretAccessKey,
+    aws_session_token: options.sessionToken,
+  };
+
+  writeFileSync(
+    configFile,
+    ini.stringify(config, {
+      whitespace: true,
+      section,
+    })
+  );
+
+  writeFileSync(
+    credentialsFile,
+    ini.stringify(credentials, {
+      whitespace: true,
+      section: section ? section.replace("profile ", "") : undefined,
+    })
+  );
+};
diff --git a/src/util.ts b/src/util.ts
new file mode 100644
index 0000000..6ac32f9
--- /dev/null
+++ b/src/util.ts
@@ -0,0 +1,44 @@
+import * as vscode from "vscode";
+import * as path from "path";
+import * as os from "os";
+
+const hasCode = <T>(error: T): error is T & { code: string } => {
+  return typeof (error as { code?: unknown }).code === "string";
+};
+
+const isFileNotFoundError = (err: unknown): boolean => {
+  if (err instanceof vscode.FileSystemError) {
+    return err.code === vscode.FileSystemError.FileNotFound().code;
+  } else if (hasCode(err)) {
+    return err.code === "ENOENT";
+  }
+
+  return false;
+};
+
+export const fileExists = async (
+  file: string | vscode.Uri
+): Promise<boolean> => {
+  const uri = typeof file === "string" ? vscode.Uri.file(file) : file;
+
+  return vscode.workspace.fs.stat(uri).then(
+    () => true,
+    (err) => !isFileNotFoundError(err)
+  );
+};
+
+export const getHomeDirectory = (): string => {
+  if (process.env.HOME !== undefined) {
+    return process.env.HOME;
+  }
+  if (process.env.USERPROFILE !== undefined) {
+    return process.env.USERPROFILE;
+  }
+  if (process.env.HOMEPATH !== undefined) {
+    const homeDrive: string = process.env.HOMEDRIVE || "C:";
+
+    return path.join(homeDrive, process.env.HOMEPATH);
+  }
+
+  return os.homedir();
+};
diff --git a/yarn.lock b/yarn.lock
index 8e814e2..b992f5e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1043,16 +1043,36 @@
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-1.0.5.tgz#a6ce3e556e00fd9895dd872dd172ad0d4bd687f4"
   integrity sha512-/kYRxGDLWzHOB7q+wtSUQlFrtcdUccpfy+X+9iMBpHK8QLLhx2wIPYuS5DYtR9Wa/YlZAbIovy7qVdB1Aq6Lyw==
 
+"@types/fs-extra@^11.0.4":
+  version "11.0.4"
+  resolved "https://registry.yarnpkg.com/@types/fs-extra/-/fs-extra-11.0.4.tgz#e16a863bb8843fba8c5004362b5a73e17becca45"
+  integrity sha512-yTbItCNreRooED33qjunPthRcSjERP1r4MqCZc7wv0u2sUkzTFp45tgUfS5+r7FrZPdmCCNflLhVSP/o+SemsQ==
+  dependencies:
+    "@types/jsonfile" "*"
+    "@types/node" "*"
+
 "@types/humanize-duration@^3.27.3":
   version "3.27.3"
   resolved "https://registry.yarnpkg.com/@types/humanize-duration/-/humanize-duration-3.27.3.tgz#fa49ada1cc65222d5f1295c7756b6877f5a96bcf"
   integrity sha512-wiiiFYjnrYDJE/ujU7wS/NShqp12IKrejozjDtcejP0zYi+cjyjVcfZHwcFUDKVJ7tHGsmgeW2ED92ABIIjfpg==
 
+"@types/ini@^1.3.34":
+  version "1.3.34"
+  resolved "https://registry.yarnpkg.com/@types/ini/-/ini-1.3.34.tgz#99a69ecfccdfc3f6e91b411d4208aaa3c4cc9685"
+  integrity sha512-FafeLhwmWucTi31ZYg/6aHBZNyrogQ35aDvSW7zMAz3HMhUqQ4G/NBya8c5pe2jwoYsDFwra8O9/yZotong76g==
+
 "@types/json-schema@*", "@types/json-schema@^7.0.12", "@types/json-schema@^7.0.8":
   version "7.0.15"
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.15.tgz#596a1747233694d50f6ad8a7869fcb6f56cf5841"
   integrity sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==
 
+"@types/jsonfile@*":
+  version "6.1.4"
+  resolved "https://registry.yarnpkg.com/@types/jsonfile/-/jsonfile-6.1.4.tgz#614afec1a1164e7d670b4a7ad64df3e7beb7b702"
+  integrity sha512-D5qGUYwjvnNNextdU59/+fI+spnwtTFmyQP0h+PfIOSkNfpU6AOICUOkm4i0OnSk+NyjdPJrxCDro0sJsWlRpQ==
+  dependencies:
+    "@types/node" "*"
+
 "@types/mocha@^10.0.3":
   version "10.0.6"
   resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-10.0.6.tgz#818551d39113081048bdddbef96701b4e8bb9d1b"
@@ -2207,6 +2227,15 @@ fs-extra@^10.1.0:
     jsonfile "^6.0.1"
     universalify "^2.0.0"
 
+fs-extra@^11.2.0:
+  version "11.2.0"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-11.2.0.tgz#e70e17dfad64232287d01929399e0ea7c86b0e5b"
+  integrity sha512-PmDi3uwK5nFuXh7XDTlVnS17xJS7vW36is2+w3xcv8SVxiB4NyATf4ctkVY5bkSjX0Y4nbvZCq1/EjtEyr9ktw==
+  dependencies:
+    graceful-fs "^4.2.0"
+    jsonfile "^6.0.1"
+    universalify "^2.0.0"
+
 fs.realpath@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
@@ -2459,6 +2488,11 @@ inherits@2, inherits@^2.0.3, inherits@^2.0.4, inherits@~2.0.3:
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.4.tgz#0fa2c64f932917c3433a0ded55363aae37416b7c"
   integrity sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==
 
+ini@^4.1.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/ini/-/ini-4.1.1.tgz#d95b3d843b1e906e56d6747d5447904ff50ce7a1"
+  integrity sha512-QQnnxNyfvmHFIsj7gkPcYymR8Jdw/o7mp5ZFihxn6h8Ci6fh3Dx4E1gPjpQEpIuPo9XVNY/ZUwh4BPMjGyL01g==
+
 ini@~1.3.0:
   version "1.3.8"
   resolved "https://registry.yarnpkg.com/ini/-/ini-1.3.8.tgz#a29da425b48806f34767a4efce397269af28432c"