diff --git a/Cargo.toml b/Cargo.toml
index 8c5951f..a223167 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -51,21 +51,21 @@ harness = false
 
 [dependencies]
 clap = { version = "2.33.3", optional = true }
-num-rational = "0.3.2"
-num-bigint = "0.3.1"
+num-rational = "0.4"
+num-bigint = "0.4"
 num-traits = "0.2.14"
 once_cell = "1.5.2"
-rand = { version = "0.7.3", optional = true }
+rand = { version = "0.8", optional = true }
 codemap = "0.1.3"
-peekmore = "0.5.6"
+peekmore = "1.0"
 wasm-bindgen = { version = "0.2.68", optional = true }
-beef = "0.4.4"
-phf = { version = "0.8.0", features = ["macros"] }
+beef = "0.5"
+phf = { version = "0.9", features = ["macros"] }
 # criterion is not a dev-dependency because it makes tests take too
 # long to compile, and you cannot make dev-dependencies optional
 criterion = { version = "0.3.3", optional = true }
 indexmap = "1.6.0"
-lasso = "0.3.1"
+lasso = "0.5"
 
 [features]
 default = ["commandline", "random"]
diff --git a/src/builtin/functions/math.rs b/src/builtin/functions/math.rs
index 126d87a..3deb68e 100644
--- a/src/builtin/functions/math.rs
+++ b/src/builtin/functions/math.rs
@@ -130,7 +130,7 @@ pub(crate) fn random(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<
         Value::Null => {
             let mut rng = rand::thread_rng();
             return Ok(Value::Dimension(
-                Some(Number::from(rng.gen_range(0.0, 1.0))),
+                Some(Number::from(rng.gen_range(0.0..1.0))),
                 Unit::None,
                 true,
             ));
@@ -173,7 +173,7 @@ pub(crate) fn random(mut args: CallArgs, parser: &mut Parser<'_>) -> SassResult<
 
     let mut rng = rand::thread_rng();
     Ok(Value::Dimension(
-        Some(Number::from(rng.gen_range(0, limit) + 1)),
+        Some(Number::from(rng.gen_range(0..limit) + 1)),
         Unit::None,
         true,
     ))
diff --git a/src/builtin/functions/string.rs b/src/builtin/functions/string.rs
index 2dbc88b..4a2d150 100644
--- a/src/builtin/functions/string.rs
+++ b/src/builtin/functions/string.rs
@@ -319,6 +319,7 @@ pub(crate) fn unique_id(args: CallArgs, _: &mut Parser<'_>) -> SassResult<Value>
     let mut rng = thread_rng();
     let string = std::iter::repeat(())
         .map(|()| rng.sample(Alphanumeric))
+        .map(char::from)
         .take(7)
         .collect();
     Ok(Value::String(string, QuoteKind::None))