diff --git a/Cargo.lock b/Cargo.lock
index c95f342..eae45c1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -897,18 +897,18 @@ checksum = "73b4b750c782965c211b42f022f59af1fbceabdd026623714f104152f1ec149f"
 
 [[package]]
 name = "serde"
-version = "1.0.133"
+version = "1.0.134"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97565067517b60e2d1ea8b268e59ce036de907ac523ad83a0475da04e818989a"
+checksum = "96b3c34c1690edf8174f5b289a336ab03f568a4460d8c6df75f2f3a692b3bc6a"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.133"
+version = "1.0.134"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed201699328568d8d08208fdd080e3ff594e6c422e438b6705905da01005d537"
+checksum = "784ed1fbfa13fe191077537b0d70ec8ad1e903cfe04831da608aa36457cb653d"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1230,6 +1230,7 @@ dependencies = [
  "env_logger 0.9.0",
  "inotify",
  "itertools",
+ "lazy_static",
  "log",
  "mockall",
  "serde",
diff --git a/Cargo.toml b/Cargo.toml
index 885f674..5a496c8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,6 +19,7 @@ ddc-hi = "0.4"
 log = "0.4"
 env_logger = "0.9"
 inotify = "0.10"
+lazy_static = "1.4"
 
 [dev-dependencies]
 mockall = "0.10"
diff --git a/src/brightness/ddcutil.rs b/src/brightness/ddcutil.rs
index 948dea1..09a5108 100644
--- a/src/brightness/ddcutil.rs
+++ b/src/brightness/ddcutil.rs
@@ -1,7 +1,13 @@
 use ddc_hi::{Ddc, Display, FeatureCode};
 use itertools::Itertools;
+use lazy_static::lazy_static;
 use std::cell::RefCell;
 use std::error::Error;
+use std::sync::Mutex;
+
+lazy_static! {
+    static ref DDC_MUTEX: Mutex<()> = Mutex::new(());
+}
 
 const DDC_BRIGHTNESS_FEATURE: FeatureCode = 0x10;
 
@@ -26,6 +32,9 @@ impl DdcUtil {
 
 impl super::Brightness for DdcUtil {
     fn get(&mut self) -> Result<u64, Box<dyn Error>> {
+        let _lock = DDC_MUTEX
+            .lock()
+            .expect("Unable to acquire exclusive access to DDC API");
         Ok(self
             .display
             .borrow_mut()
@@ -35,6 +44,9 @@ impl super::Brightness for DdcUtil {
     }
 
     fn set(&mut self, value: u64) -> Result<u64, Box<dyn Error>> {
+        let _lock = DDC_MUTEX
+            .lock()
+            .expect("Unable to acquire exclusive access to DDC API");
         let value = value.max(self.min_brightness).min(self.max_brightness);
         self.display
             .borrow_mut()