diff --git a/envoy/admin/v2alpha/memory.proto b/envoy/admin/v2alpha/memory.proto
index f4158f4b..d86e4488 100644
--- a/envoy/admin/v2alpha/memory.proto
+++ b/envoy/admin/v2alpha/memory.proto
@@ -10,7 +10,7 @@ option java_package = "io.envoyproxy.envoy.admin.v2alpha";
 
 // Proto representation of the internal memory consumption of an Envoy instance. These represent
 // values extracted from an internal TCMalloc instance. For more information, see the section of the
-// docs entitled ["Generic Tcmalloc Status"](http://gperftools.github.io/gperftools/tcmalloc.html).
+// docs entitled ["Generic Tcmalloc Status"](https://gperftools.github.io/gperftools/tcmalloc.html).
 message Memory {
 
   // The number of bytes allocated by the heap for Envoy. This is an alias for
diff --git a/envoy/api/v2/route/route.proto b/envoy/api/v2/route/route.proto
index a2d0455e..3cbf7268 100644
--- a/envoy/api/v2/route/route.proto
+++ b/envoy/api/v2/route/route.proto
@@ -330,7 +330,7 @@ message RouteMatch {
     // regex must match the *:path* header once the query string is removed. The entire path
     // (without the query string) must match the regex. The rule will not match if only a
     // subsequence of the *:path* header matches the regex. The regex grammar is defined `here
-    // <http://en.cppreference.com/w/cpp/regex/ecmascript>`_.
+    // <https://en.cppreference.com/w/cpp/regex/ecmascript>`_.
     //
     // Examples:
     //
@@ -983,7 +983,7 @@ message Decorator {
 message VirtualCluster {
   // Specifies a regex pattern to use for matching requests. The entire path of the request
   // must match the regex. The regex grammar used is defined `here
-  // <http://en.cppreference.com/w/cpp/regex/ecmascript>`_.
+  // <https://en.cppreference.com/w/cpp/regex/ecmascript>`_.
   //
   // Examples:
   //
@@ -1179,7 +1179,7 @@ message HeaderMatcher {
     // If specified, this regex string is a regular expression rule which implies the entire request
     // header value must match the regex. The rule will not match if only a subsequence of the
     // request header value matches the regex. The regex grammar used in the value field is defined
-    // `here <http://en.cppreference.com/w/cpp/regex/ecmascript>`_.
+    // `here <https://en.cppreference.com/w/cpp/regex/ecmascript>`_.
     //
     // Examples:
     //
diff --git a/envoy/config/trace/v2/trace.proto b/envoy/config/trace/v2/trace.proto
index 10c25df5..c4b69fc4 100644
--- a/envoy/config/trace/v2/trace.proto
+++ b/envoy/config/trace/v2/trace.proto
@@ -58,7 +58,7 @@ message LightstepConfig {
   string collector_cluster = 1 [(validate.rules).string.min_bytes = 1];
 
   // File containing the access token to the `LightStep
-  // <http://lightstep.com/>`_ API.
+  // <https://lightstep.com/>`_ API.
   string access_token_file = 2 [(validate.rules).string.min_bytes = 1];
 }
 
diff --git a/envoy/type/http_status.proto b/envoy/type/http_status.proto
index 9d9a6230..3f89ada0 100644
--- a/envoy/type/http_status.proto
+++ b/envoy/type/http_status.proto
@@ -9,7 +9,7 @@ option java_package = "io.envoyproxy.envoy.type";
 import "validate/validate.proto";
 
 // HTTP response codes supported in Envoy.
-// For more details: http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
+// For more details: https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
 enum StatusCode {
   // Empty - This code not part of the HTTP status code specification, but it is needed for proto
   // `enum` type.
diff --git a/envoy/type/matcher/string.proto b/envoy/type/matcher/string.proto
index 02077522..55f2171a 100644
--- a/envoy/type/matcher/string.proto
+++ b/envoy/type/matcher/string.proto
@@ -41,7 +41,7 @@ message StringMatcher {
 
     // The input string must match the regular expression specified here.
     // The regex grammar is defined `here
-    // <http://en.cppreference.com/w/cpp/regex/ecmascript>`_.
+    // <https://en.cppreference.com/w/cpp/regex/ecmascript>`_.
     //
     // Examples:
     //