diff --git a/README.md b/README.md
index ad492d7..d494ceb 100644
--- a/README.md
+++ b/README.md
@@ -137,6 +137,8 @@ When passing options objects, the following special keys are supported:
 - `$nullOnError`: Return null instead of throwing on error
 - `$onStdout`: Callback for stdout in spawn mode
 - `$onStderr`: Callback for stderr in spawn mode
+- `$env`: Object of environment variables to set on the spawned process
+- `$config`: Object of `key=value` config overrides injected as `-c` flags before the subcommand (e.g. `{ $config: { 'gc.auto': '0' } }`)
 
 ### Common Methods
 
diff --git a/index.d.ts b/index.d.ts
index 863f1c5..2572b25 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -33,6 +33,8 @@ declare module 'git-client' {
     $cwd?: string;
     /** Custom environment variables */
     $env?: Record<string, string>;
+    /** Inject `-c key=value` config overrides before the subcommand */
+    $config?: Record<string, string>;
     /** Additional options */
     $options?: Record<string, any>;
     /** Any git command options */
diff --git a/lib/Git.js b/lib/Git.js
index 78c0d14..a873c9e 100644
--- a/lib/Git.js
+++ b/lib/Git.js
@@ -714,6 +714,11 @@ class Git {
                         delete arg.$env;
                     }
 
+                    if ('$config' in arg) {
+                        execOptions.config = Object.assign(execOptions.config || {}, arg.$config);
+                        delete arg.$config;
+                    }
+
                     if ('$preserveEnv' in arg) {
                         execOptions.preserveEnv = arg.$preserveEnv;
                         delete arg.$preserveEnv;
@@ -765,6 +770,16 @@ class Git {
             gitOptions['work-tree'] = execOptions.workTree;
         }
 
+        if (execOptions.config) {
+            const configArgs = [];
+            for (const key in execOptions.config) {
+                configArgs.push(`${key}=${execOptions.config[key]}`);
+            }
+            if (configArgs.length) {
+                gitOptions['c'] = configArgs;
+            }
+        }
+
         commandArgs.unshift.apply(commandArgs, Git.cliOptionsToArgs(gitOptions));
 
 
diff --git a/package-lock.json b/package-lock.json
index a9cbf2a..1863c04 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2160,9 +2160,9 @@
       }
     },
     "node_modules/lodash": {
-      "version": "4.17.23",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.23.tgz",
-      "integrity": "sha512-LgVTMpQtIopCi79SJeDiP0TfWi5CNEc/L/aRdTh3yIvmZXTnheWpKjSZhnvMl8iXbC1tFg9gdHHDMLoV7CnG+w==",
+      "version": "4.18.1",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.18.1.tgz",
+      "integrity": "sha512-dMInicTPVE8d1e5otfwmmjlxkZoUpiVLwyeTdUsi/Caj/gfzzblBcCE5sRHV/AsjuCmxWrte2TNGSYuCeCq+0Q==",
       "dev": true,
       "license": "MIT"
     },
@@ -2270,9 +2270,9 @@
       }
     },
     "node_modules/micromatch/node_modules/picomatch": {
-      "version": "2.3.1",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.1.tgz",
-      "integrity": "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==",
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.2.tgz",
+      "integrity": "sha512-V7+vQEJ06Z+c5tSye8S+nHUfI51xoXIXjHQ99cQtKUkQqqO1kO/KCJUfZXuB47h/YBlDhah2H3hdUGXn8ie0oA==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -2618,9 +2618,9 @@
       }
     },
     "node_modules/picomatch": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
-      "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.4.tgz",
+      "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
       "dev": true,
       "license": "MIT",
       "engines": {
diff --git a/test/git.js b/test/git.js
index 1149240..9b18b11 100644
--- a/test/git.js
+++ b/test/git.js
@@ -69,6 +69,33 @@ test('other git executes with correct git dir with override', async t => {
     t.is(await fs.realpath(gitDir), repo1Dir);
 });
 
+test('$config injects -c <key>=<value> before subcommand', async t => {
+    // Read back a config value that only exists via $config injection
+    const value = await git.config(
+        { $config: { 'holo.injected': 'yes' } },
+        '--get',
+        'holo.injected',
+    );
+
+    t.is(value, 'yes');
+});
+
+test('$config supports multiple entries', async t => {
+    const first = await git.config(
+        { $config: { 'holo.first': '1', 'holo.second': '2' } },
+        '--get',
+        'holo.first',
+    );
+    const second = await git.config(
+        { $config: { 'holo.first': '1', 'holo.second': '2' } },
+        '--get',
+        'holo.second',
+    );
+
+    t.is(first, '1');
+    t.is(second, '2');
+});
+
 test('checkout git repo to temporary directory', async t => {
     const [tmpWorkTree, tmpIndexFilePath] = await Promise.all([tmp.dir(), tmp.tmpName()]);