diff --git a/Cargo.lock b/Cargo.lock
index eed4c0b..3870dbb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3861,7 +3861,6 @@ dependencies = [
  "libc",
  "log",
  "mimalloc",
- "once_cell",
  "open",
  "predicates",
  "pretty_assertions",
diff --git a/Cargo.toml b/Cargo.toml
index 03c3d8e..93de376 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ license = "Apache-2.0 OR MIT"
 readme = "README.md"
 repository = "https://github.com/rustic-rs/rustic"
 resolver = "2"
-rust-version = "1.76.0"
+rust-version = "1.80.0"
 description = """
 rustic - fast, encrypted, deduplicated backups powered by Rust
 """
@@ -74,14 +74,14 @@ thiserror = "1"
 # serialization
 serde = { version = "1", features = ["serde_derive"] }
 serde_json = "1"
-serde_with = { version = "3.10", features = ["base64"] }
+serde_with = { version = "3", features = ["base64"] }
 
 # other dependencies
-aho-corasick = "1.1.3"
+aho-corasick = "1"
 chrono = { version = "0.4", default-features = false, features = ["clock", "serde"] }
-comfy-table = "7.1.1"
-rhai = { version = "1.19", features = ["sync", "serde", "no_optimize", "no_module", "no_custom_syntax", "only_i64"] }
-scopeguard = "1.2"
+comfy-table = "7"
+rhai = { version = "1", features = ["sync", "serde", "no_optimize", "no_module", "no_custom_syntax", "only_i64"] }
+scopeguard = "1"
 semver = { version = "1", optional = true }
 simplelog = "0.12"
 
@@ -93,16 +93,15 @@ clap_complete = "4"
 conflate = "0.2"
 convert_case = "0.6.0"
 dateparser = "0.2.1"
-derive_more = { version = "1.0.0", features = ["debug"] }
+derive_more = { version = "1", features = ["debug"] }
 dialoguer = "0.11.0"
 directories = "5"
 gethostname = "0.5"
 globset = "0.4.15"
-human-panic = "2.0.1"
+human-panic = "2"
 humantime = "2"
 indicatif = "0.17"
 itertools = "0.13"
-once_cell = "1.20"
 open = "5.3.0"
 self_update = { version = "0.39.0", default-features = false, optional = true, features = ["rustls", "archive-tar", "compression-flate2"] } # FIXME: Downgraded to 0.39.0 due to https://github.com/jaemk/self_update/issues/136
 tar = "0.4.42"
diff --git a/README.md b/README.md
index 3486ede..9dc5d79 100644
--- a/README.md
+++ b/README.md
@@ -143,7 +143,7 @@ Please make sure, that you read the
 
 ## Minimum Rust version policy
 
-This crate's minimum supported `rustc` version is `1.76.0`.
+This crate's minimum supported `rustc` version is `1.80.0`.
 
 The current policy is that the minimum Rust version required to use this crate
 can be increased in minor version updates. For example, if `crate 1.0` requires
diff --git a/tests/completions.rs b/tests/completions.rs
index f278df9..d2e15fc 100644
--- a/tests/completions.rs
+++ b/tests/completions.rs
@@ -13,10 +13,9 @@
 use std::{
     io::{Read, Write},
     path::PathBuf,
+    sync::LazyLock,
 };
 
-use once_cell::sync::Lazy;
-
 use abscissa_core::testing::prelude::*;
 
 use rustic_testing::{files_differ, get_temp_file, TestResult};
@@ -25,7 +24,7 @@ use rustic_testing::{files_differ, get_temp_file, TestResult};
 /// the runner acquire a mutex when executing commands and inspecting
 /// exit statuses, serializing what would otherwise be multithreaded
 /// invocations as `cargo test` executes tests in parallel by default.
-pub static LAZY_RUNNER: Lazy<CmdRunner> = Lazy::new(|| {
+pub static LAZY_RUNNER: LazyLock<CmdRunner> = LazyLock::new(|| {
     let mut runner = CmdRunner::new(env!("CARGO_BIN_EXE_rustic"));
     runner.exclusive().capture_stdout();
     runner
diff --git a/tests/show-config.rs b/tests/show-config.rs
index 9686550..582228e 100644
--- a/tests/show-config.rs
+++ b/tests/show-config.rs
@@ -13,10 +13,9 @@
 use std::{
     io::{Read, Write},
     path::PathBuf,
+    sync::LazyLock,
 };
 
-use once_cell::sync::Lazy;
-
 use abscissa_core::testing::prelude::*;
 
 use rustic_testing::{files_differ, get_temp_file, TestResult};
@@ -25,7 +24,7 @@ use rustic_testing::{files_differ, get_temp_file, TestResult};
 // the runner acquire a mutex when executing commands and inspecting
 // exit statuses, serializing what would otherwise be multithreaded
 // invocations as `cargo test` executes tests in parallel by default.
-pub static LAZY_RUNNER: Lazy<CmdRunner> = Lazy::new(|| {
+pub static LAZY_RUNNER: LazyLock<CmdRunner> = LazyLock::new(|| {
     let mut runner = CmdRunner::new(env!("CARGO_BIN_EXE_rustic"));
     runner.exclusive().capture_stdout();
     runner