diff --git a/library/alloc/src/collections/binary_heap.rs b/library/alloc/src/collections/binary_heap.rs
index 8398cfa3bd3..477a598ff5b 100644
--- a/library/alloc/src/collections/binary_heap.rs
+++ b/library/alloc/src/collections/binary_heap.rs
@@ -12,9 +12,9 @@
 //! to solve the [shortest path problem][sssp] on a [directed graph][dir_graph].
 //! It shows how to use [`BinaryHeap`] with custom types.
 //!
-//! [dijkstra]: http://en.wikipedia.org/wiki/Dijkstra%27s_algorithm
-//! [sssp]: http://en.wikipedia.org/wiki/Shortest_path_problem
-//! [dir_graph]: http://en.wikipedia.org/wiki/Directed_graph
+//! [dijkstra]: https://en.wikipedia.org/wiki/Dijkstra%27s_algorithm
+//! [sssp]: https://en.wikipedia.org/wiki/Shortest_path_problem
+//! [dir_graph]: https://en.wikipedia.org/wiki/Directed_graph
 //! [`BinaryHeap`]: struct.BinaryHeap.html
 //!
 //! ```
diff --git a/library/core/src/cmp.rs b/library/core/src/cmp.rs
index e775ded60f5..b9ad50f7703 100644
--- a/library/core/src/cmp.rs
+++ b/library/core/src/cmp.rs
@@ -25,7 +25,7 @@
 use self::Ordering::*;
 
 /// Trait for equality comparisons which are [partial equivalence
-/// relations](http://en.wikipedia.org/wiki/Partial_equivalence_relation).
+/// relations](https://en.wikipedia.org/wiki/Partial_equivalence_relation).
 ///
 /// This trait allows for partial equality, for types that do not have a full
 /// equivalence relation. For example, in floating point numbers `NaN != NaN`,
diff --git a/library/std/src/sync/barrier.rs b/library/std/src/sync/barrier.rs
index 01314370ce3..23c989fd2fd 100644
--- a/library/std/src/sync/barrier.rs
+++ b/library/std/src/sync/barrier.rs
@@ -131,7 +131,7 @@ impl Barrier {
         lock.count += 1;
         if lock.count < self.num_threads {
             // We need a while loop to guard against spurious wakeups.
-            // http://en.wikipedia.org/wiki/Spurious_wakeup
+            // https://en.wikipedia.org/wiki/Spurious_wakeup
             while local_gen == lock.generation_id && lock.count < self.num_threads {
                 lock = self.cvar.wait(lock).unwrap();
             }
diff --git a/library/test/src/stats.rs b/library/test/src/stats.rs
index 077005371c0..c02f93bf9d4 100644
--- a/library/test/src/stats.rs
+++ b/library/test/src/stats.rs
@@ -84,7 +84,7 @@ pub trait Stats {
     /// by the constant `1.4826` to allow its use as a consistent estimator for the standard
     /// deviation.
     ///
-    /// See: <http://en.wikipedia.org/wiki/Median_absolute_deviation>
+    /// See: <https://en.wikipedia.org/wiki/Median_absolute_deviation>
     fn median_abs_dev(&self) -> f64;
 
     /// Median absolute deviation as a percent of the median. See `median_abs_dev` and `median`.
@@ -96,7 +96,7 @@ pub trait Stats {
     ///
     /// Calculated by linear interpolation between closest ranks.
     ///
-    /// See: <http://en.wikipedia.org/wiki/Percentile>
+    /// See: <https://en.wikipedia.org/wiki/Percentile>
     fn percentile(&self, pct: f64) -> f64;
 
     /// Quartiles of the sample: three values that divide the sample into four equal groups, each
@@ -302,7 +302,7 @@ fn percentile_of_sorted(sorted_samples: &[f64], pct: f64) -> f64 {
 /// It differs from trimming in that it does not change the number of samples,
 /// just changes the values of those that are outliers.
 ///
-/// See: <http://en.wikipedia.org/wiki/Winsorising>
+/// See: <https://en.wikipedia.org/wiki/Winsorising>
 pub fn winsorize(samples: &mut [f64], pct: f64) {
     let mut tmp = samples.to_vec();
     local_sort(&mut tmp);
diff --git a/src/librustc_expand/mbe.rs b/src/librustc_expand/mbe.rs
index e9e6fc5af22..9aed307ec93 100644
--- a/src/librustc_expand/mbe.rs
+++ b/src/librustc_expand/mbe.rs
@@ -61,7 +61,7 @@ impl KleeneToken {
     }
 }
 
-/// A Kleene-style [repetition operator](http://en.wikipedia.org/wiki/Kleene_star)
+/// A Kleene-style [repetition operator](https://en.wikipedia.org/wiki/Kleene_star)
 /// for token sequences.
 #[derive(Clone, PartialEq, Encodable, Decodable, Debug, Copy)]
 enum KleeneOp {
diff --git a/src/librustc_middle/ty/sty.rs b/src/librustc_middle/ty/sty.rs
index 0a6e17a43d8..c1f354c7a15 100644
--- a/src/librustc_middle/ty/sty.rs
+++ b/src/librustc_middle/ty/sty.rs
@@ -1264,7 +1264,7 @@ rustc_index::newtype_index! {
     /// De Bruijn index of 0, because the innermost binder in that location
     /// is the outer fn.
     ///
-    /// [dbi]: http://en.wikipedia.org/wiki/De_Bruijn_index
+    /// [dbi]: https://en.wikipedia.org/wiki/De_Bruijn_index
     #[derive(HashStable)]
     pub struct DebruijnIndex {
         DEBUG_FORMAT = "DebruijnIndex({})",
diff --git a/src/librustc_symbol_mangling/legacy.rs b/src/librustc_symbol_mangling/legacy.rs
index 2ae13b501e9..24356844baf 100644
--- a/src/librustc_symbol_mangling/legacy.rs
+++ b/src/librustc_symbol_mangling/legacy.rs
@@ -136,7 +136,7 @@ fn get_symbol_hash<'tcx>(
 }
 
 // Follow C++ namespace-mangling style, see
-// http://en.wikipedia.org/wiki/Name_mangling for more info.
+// https://en.wikipedia.org/wiki/Name_mangling for more info.
 //
 // It turns out that on macOS you can actually have arbitrary symbols in
 // function names (at least when given to LLVM), but this is not possible
diff --git a/src/test/ui/unboxed-closures/unboxed-closures-infer-recursive-fn.rs b/src/test/ui/unboxed-closures/unboxed-closures-infer-recursive-fn.rs
index 86834f49407..a0fbbafe25f 100644
--- a/src/test/ui/unboxed-closures/unboxed-closures-infer-recursive-fn.rs
+++ b/src/test/ui/unboxed-closures/unboxed-closures-infer-recursive-fn.rs
@@ -7,7 +7,7 @@ use std::marker::PhantomData;
 // closure.  As far as I can tell, coding up a recursive closure
 // requires the good ol' [Y Combinator].
 //
-// [Y Combinator]: http://en.wikipedia.org/wiki/Fixed-point_combinator#Y_combinator
+// [Y Combinator]: https://en.wikipedia.org/wiki/Fixed-point_combinator#Y_combinator
 
 struct YCombinator<F,A,R> {
     func: F,