diff --git a/Cargo.lock b/Cargo.lock
index f01b2a5..2f73403 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -228,12 +228,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "equivalent"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
-
 [[package]]
 name = "errno"
 version = "0.3.8"
@@ -244,28 +238,12 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "hashbrown"
-version = "0.14.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
-
 [[package]]
 name = "heck"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
-[[package]]
-name = "indexmap"
-version = "2.2.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "168fb715dda47215e360912c096649d23d58bf392ac62f73919e831745e40f26"
-dependencies = [
- "equivalent",
- "hashbrown",
-]
-
 [[package]]
 name = "itoa"
 version = "1.0.11"
@@ -320,8 +298,8 @@ dependencies = [
  "rust-apt",
  "serde",
  "serde_json",
- "serde_yaml",
  "termios",
+ "toml",
  "walkdir",
 ]
 
@@ -472,19 +450,6 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "serde_yaml"
-version = "0.9.34+deprecated"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a8b1a1a2ebf674015cc02edccce75287f1a0130d394307b36743c2f5d504b47"
-dependencies = [
- "indexmap",
- "itoa",
- "ryu",
- "serde",
- "unsafe-libyaml",
-]
-
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -530,6 +495,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "toml"
+version = "0.4.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "758664fc71a3a69038656bee8b6be6477d2a6c315a6b81f7081f591bffa4111f"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.12"
@@ -548,12 +522,6 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f962df74c8c05a667b5ee8bcf162993134c104e96440b663c8daa176dc772d8c"
 
-[[package]]
-name = "unsafe-libyaml"
-version = "0.2.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "673aac59facbab8a9007c7f6108d11f63b603f7cabff99fabf650fea5c32b861"
-
 [[package]]
 name = "utf8parse"
 version = "0.2.1"
diff --git a/README.md b/README.md
index a22c470..31d8939 100644
--- a/README.md
+++ b/README.md
@@ -130,7 +130,7 @@ This tree shows my pacdef repository (not the `pacdef` config dir).
 │   ├── hostname_a
 │   ├── hostname_b
 │   └── hostname_c
-└── pacdef.yaml
+└── pacdef.toml
 ```
 
 - The `base` group holds all packages I need unconditionally, and includes things like zfs,
@@ -174,18 +174,18 @@ Use `--help` or the zsh completion to find the right aliases.
 
 ## Configuration
 
-On first execution, it will create an empty config file under `$XDG_CONFIG_HOME/pacdef/pacdef.yaml`.
+On first execution, it will create an empty config file under `$XDG_CONFIG_HOME/pacdef/pacdef.toml`.
 The following key-value pairs can be set.
 The listed values are the defaults.
 
-```yaml
-aur_helper: paru  # AUR helper to use on Arch Linux (paru, yay, ...)
-aur_rm_args: []  # additional args to pass to AUR helper when removing packages (optional)
-disabled_backends: []  # backends that pacdef should not manage, e.g. ["python"], this can reduce runtime if the package manager is notoriously slow (like pip)
+```toml
+aur_helper = paru  # AUR helper to use on Arch Linux (paru, yay, ...)
+aur_rm_args = []  # additional args to pass to AUR helper when removing packages (optional)
+disabled_backends = []  # backends that pacdef should not manage, e.g. ["python"], this can reduce runtime if the package manager is notoriously slow (like pip)
 
-warn_not_symlinks: true  # warn if a group file is not a symlink
-flatpak_systemwide: true  # whether flatpak packages should be installed system-wide or per user
-pip_binary: pip  # choose whether to use pipx instead of pip for python package management (see below, 'pitfalls while using pipx')
+warn_not_symlinks = true  # warn if a group file is not a symlink
+flatpak_systemwide = true  # whether flatpak packages should be installed system-wide or per user
+pip_binary = pip  # choose whether to use pipx instead of pip for python package management (see below, 'pitfalls while using pipx')
 ```
 
 
diff --git a/crates/pacdef/Cargo.toml b/crates/pacdef/Cargo.toml
index d378fa4..bd71cad 100644
--- a/crates/pacdef/Cargo.toml
+++ b/crates/pacdef/Cargo.toml
@@ -23,7 +23,7 @@ enum_dispatch = "0.3"
 
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-serde_yaml = "0.9"
+toml = "0.4"
 
 # backends
 alpm = { version = "3.0", optional = true }
diff --git a/crates/pacdef/src/config.rs b/crates/pacdef/src/config.rs
index 77ff2df..50f7e88 100644
--- a/crates/pacdef/src/config.rs
+++ b/crates/pacdef/src/config.rs
@@ -6,7 +6,7 @@ use anyhow::{bail, Context, Result};
 use serde::{Deserialize, Serialize};
 
 // Update the master README if fields change.
-/// Config for the program, as listed in `$XDG_CONFIG_HOME/pacdef/pacdef.yaml`.
+/// Config for the program, as listed in `$XDG_CONFIG_HOME/pacdef/pacdef.toml`.
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Config {
     /// The AUR helper to use for Arch Linux.
@@ -61,7 +61,7 @@ impl Config {
             }
         };
 
-        serde_yaml::from_str(&content).context("parsing yaml config")
+        toml::from_str(&content).context("parsing toml config")
     }
 
     /// Save the instance of [`Config`] to disk.
@@ -70,7 +70,7 @@ impl Config {
     ///
     /// This function will return an error if the config file cannot be saved to disk.
     pub fn save(&self, file: &Path) -> Result<()> {
-        let content = serde_yaml::to_string(&self).context("converting Config to yaml")?;
+        let content = toml::to_string(&self).context("converting Config to toml")?;
 
         let parent = file.parent().context("getting parent of config dir")?;
         if !parent.is_dir() {
diff --git a/crates/pacdef/src/main.rs b/crates/pacdef/src/main.rs
index e54ca43..c1782e2 100644
--- a/crates/pacdef/src/main.rs
+++ b/crates/pacdef/src/main.rs
@@ -25,9 +25,9 @@ use pacdef::path::{get_config_path, get_config_path_old_version, get_group_dir};
 use pacdef::{Config, Error as PacdefError, Group};
 
 const MAJOR_UPDATE_MESSAGE: &str = "VERSION UPGRADE
-You seem to have used version 0.x of pacdef before.
-Version 1.x changes the syntax of the config files and the command line arguments.
-Check out https://github.com/steven-omaha/pacdef for new syntax information.
+You seem to have used version 1.x of pacdef before.
+In version 2.0 the config file needed to be changed from yaml to toml.
+Check out https://github.com/steven-omaha/pacdef/blob/main/README.md#configuration for new syntax information.
 This message will not appear again.
 ------";
 
diff --git a/crates/pacdef/src/path.rs b/crates/pacdef/src/path.rs
index 9c47fb7..5c26c5a 100644
--- a/crates/pacdef/src/path.rs
+++ b/crates/pacdef/src/path.rs
@@ -8,8 +8,8 @@ use std::{env, path::Path};
 use anyhow::{Context, Result};
 use path_absolutize::Absolutize;
 
-const CONFIG_FILE_NAME: &str = "pacdef.yaml";
-const CONFIG_FILE_NAME_OLD: &str = "pacdef.conf";
+const CONFIG_FILE_NAME: &str = "pacdef.toml";
+const CONFIG_FILE_NAME_OLD: &str = "pacdef.yaml";
 
 /// Get the group directory where all group files are located. This is
 /// `$XDG_CONFIG_HOME/pacdef/groups`, which defaults to `$HOME/.config/pacdef/groups`.
@@ -76,7 +76,7 @@ pub fn get_home_dir() -> Result<PathBuf> {
     Ok(env::var("HOME").context("getting $HOME variable")?.into())
 }
 
-/// Get the path to the pacdef config file. This is `$XDG_CONFIG_HOME/pacdef/pacdef.yaml`.
+/// Get the path to the pacdef config file. This is `$XDG_CONFIG_HOME/pacdef/pacdef.toml`.
 ///
 /// # Errors
 ///
diff --git a/man/pacdef.8 b/man/pacdef.8
index 38c9df4..f5b7ee9 100644
--- a/man/pacdef.8
+++ b/man/pacdef.8
@@ -16,7 +16,7 @@ Each section contains one or more packages that can be installed respective pack
 
 .SH CONFIGURATION
 Configure pacdef in its config file. See
-.BR pacdef.yaml(5).
+.BR pacdef.toml(5).
 
 .SS GROUP FILE SYNTAX
 
@@ -163,5 +163,5 @@ Mostly 'steven-omaha'.
 Contributors under https://github.com/steven-omaha/pacdef/graphs/contributors.
 
 .SH SEE ALSO
-.BR pacdef.yaml(5)
+.BR pacdef.toml(5)
 
diff --git a/man/pacdef.yaml.5 b/man/pacdef.toml.5
similarity index 88%
rename from man/pacdef.yaml.5
rename to man/pacdef.toml.5
index cfe93e3..985547c 100644
--- a/man/pacdef.yaml.5
+++ b/man/pacdef.toml.5
@@ -1,11 +1,11 @@
-.TH "PACDEF.YAML" "5" "2024\-04\-13" "pacdef v1\&.6\&.0" "Pacdef Manual"
+.TH "PACDEF.TOML" "5" "2024\-04\-13" "pacdef v1\&.6\&.0" "Pacdef Manual"
 
 .SH NAME
-pacdef.yaml \(em pacdef configuration file
+pacdef.toml \(em pacdef configuration file
 .SH SYNOPSIS
-$XDG_CONFIG_HOME/pacdef/pacdef.yaml
+$XDG_CONFIG_HOME/pacdef/pacdef.toml
 .br
-$HOME/.config/pacdef/pacdef.yaml
+$HOME/.config/pacdef/pacdef.toml
 .
 .SH DESCRIPTION
 This is the config file for