diff --git a/GRADLE_PLUGIN.md b/GRADLE_PLUGIN.md
index a6110ea1e65..b83a1297b7f 100644
--- a/GRADLE_PLUGIN.md
+++ b/GRADLE_PLUGIN.md
@@ -28,7 +28,7 @@ pluginManagement {
     repositories {
         gradlePluginPortal()
         maven {
-            url = 'http://dl.bintray.com/kotlin/kotlin-eap'
+            url = 'https://dl.bintray.com/kotlin/kotlin-eap'
         }
     }
 }
@@ -50,7 +50,7 @@ buildscript {
            url "https://dl.bintray.com/jetbrains/kotlin-native-dependencies"
        }
        maven {
-           url "http://dl.bintray.com/kotlin/kotlin-eap"
+           url "https://dl.bintray.com/kotlin/kotlin-eap"
        }
    }
 
diff --git a/backend.native/tests/build.gradle b/backend.native/tests/build.gradle
index 8936091b786..ac47869ac5b 100644
--- a/backend.native/tests/build.gradle
+++ b/backend.native/tests/build.gradle
@@ -36,8 +36,8 @@ configurations {
 
 repositories {
     ivy {
-        ivyPattern      'http://teamcity.jetbrains.com/guestAuth/repository/download/[module]/[revision]/teamcity-ivy.xml'
-        artifactPattern 'http://teamcity.jetbrains.com/guestAuth/repository/download/[module]/[revision]/[artifact](.[ext])'
+        ivyPattern      'https://teamcity.jetbrains.com/guestAuth/repository/download/[module]/[revision]/teamcity-ivy.xml'
+        artifactPattern 'https://teamcity.jetbrains.com/guestAuth/repository/download/[module]/[revision]/[artifact](.[ext])'
     }
 }
 
diff --git a/gradle.properties b/gradle.properties
index ba0dbc61b5e..891357e62cf 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -16,7 +16,7 @@
 
 # A version of the Kotlin "toolchain" (compiler, runtime, stdlib etc) used by the build script.
 buildKotlinVersion=1.3.0-rc-6
-buildKotlinCompilerRepo=http://dl.bintray.com/kotlin/kotlin-dev
+buildKotlinCompilerRepo=https://dl.bintray.com/kotlin/kotlin-dev
 remoteRoot=konan_tests
 testDataVersion=1226829:id
 kotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_130_CompilerAllPlugins),number:1.3.0-rc-57,tag:kotlin-native,pinned:true/artifacts/content/maven
diff --git a/samples/calculator/build.gradle b/samples/calculator/build.gradle
index bfefa0e3edf..7faf89c1313 100644
--- a/samples/calculator/build.gradle
+++ b/samples/calculator/build.gradle
@@ -1,12 +1,12 @@
 allprojects {
     buildscript {
         repositories {
-            maven { url "http://dl.bintray.com/kotlin/kotlin-dev" }
+            maven { url "https://dl.bintray.com/kotlin/kotlin-dev" }
         }
     }
 
     repositories {
-        maven { url "http://dl.bintray.com/kotlin/kotlin-dev" }
+        maven { url "https://dl.bintray.com/kotlin/kotlin-dev" }
     }
 }