diff --git a/README.md b/README.md
index 68a001c5..450c9d4b 100644
--- a/README.md
+++ b/README.md
@@ -523,14 +523,14 @@ Color of the displayed images can be changed with `,color={color}`.
 !include <office/users/users.puml>
 
 
-AddRelTag("plantuml", $textColor="$ARROW_FONT_COLOR", $lineColor="$ARROW_COLOR", $sprite="img:http://plantuml.com/logo3.png{scale=0.3}", $legendSprite="img:http://plantuml.com/logo3.png{scale=0.1}", $legendText="console triggered")
+AddRelTag("plantuml", $textColor="$ARROW_FONT_COLOR", $lineColor="$ARROW_COLOR", $sprite="img:https://plantuml.com/logo3.png{scale=0.3}", $legendSprite="img:https://plantuml.com/logo3.png{scale=0.1}", $legendText="console triggered")
 
 Person(user, "user group displayed with a sprite", $sprite="users")
 
 
 Container(container, "Container with scaled and colored OpenIconic", $sprite="&folder,scale=5.0,color=gray")
 
-System(system, "System with an image", $sprite="img:http://plantuml.com/logo3.png")
+System(system, "System with an image", $sprite="img:https://plantuml.com/logo3.png")
 
 Rel(user, system, "Rel with image (via tags)", $tags="plantuml")
 Rel(user, container, "Rel with OpenIconinc", $sprite="&folder")
diff --git a/percy/TestLabelsWithLineBreak.puml b/percy/TestLabelsWithLineBreak.puml
index a794ca14..fc4e1db0 100644
--- a/percy/TestLabelsWithLineBreak.puml
+++ b/percy/TestLabelsWithLineBreak.puml
@@ -20,7 +20,7 @@ Rel_(p1, c1, "A relation\nwith custom direction", "o-DOWN->>")
 Rel_(p1, c2, "A relation\nwith custom direction", "and technology\nwith LBs", "o-RIGHT-o")
 
 Rel(c1, c2, "A label\nwith\nline breaks", "and technology\nwith LBs")
-Rel(c1, s1, "A linked label\nwith\nline breaks", "and technology\nwith LBs", $link = "http://www.plantuml.com")
+Rel(c1, s1, "A linked label\nwith\nline breaks", "and technology\nwith LBs", $link = "https://www.plantuml.com")
 
 Node(n1, "A node label\nwith\nline breaks", "type with\nline break", "description\nwith line break")
 Node(n2, "A node label", "PlantUML packages have no automatic line breaks, type breaks added", "PlantUML packages have no automatic line breaks, description breaks added") {
@@ -39,4 +39,4 @@ Component(to, "To component")
 Rel_("pre1", from, to, "A custom dynamic relation\nwith custom direction", "o-DOWN->>")
 Rel_("pre2", from, to, "A custom dynamic relation\nwith custom direction", "and technology\nwith LBs", "+--+")
 Rel(from, to, "A dynamic relation\nwith line break")
-@enduml
\ No newline at end of file
+@enduml
diff --git a/percy/TestLegendSprite.puml b/percy/TestLegendSprite.puml
index 1917d27a..6488463d 100644
--- a/percy/TestLegendSprite.puml
+++ b/percy/TestLegendSprite.puml
@@ -27,12 +27,12 @@ AddContainerTag("mysql_db", $sprite="database_server", $techn="MySQL 5.5.x", $le
 AddContainerTag("mongo_db", $sprite="database_server", $techn="MongoDB 2.2.x", $legendText="MongoDb database container")
 AddContainerTag("files", $sprite="file_server", $legendText="file server container")
 
-AddContainerTag("conApp", $sprite="img:http://plantuml.com/logo3.png{scale=0.3}", $legendSprite="img:http://plantuml.com/logo3.png{scale=0.1}", $legendText="console application")
+AddContainerTag("conApp", $sprite="img:https://plantuml.com/logo3.png{scale=0.3}", $legendSprite="img:https://plantuml.com/logo3.png{scale=0.1}", $legendText="console application")
 
 UpdateElementStyle("external_system", $bgColor=$EXTERNAL_SYSTEM_BG_COLOR, $fontColor=$EXTERNAL_SYSTEM_FONT_COLOR, $borderColor=$EXTERNAL_SYSTEM_BORDER_COLOR, $sprite = "osa_server", , $legendText="external system")
 
 AddRelTag("firewall", $textColor="$ARROW_FONT_COLOR", $lineColor="$ARROW_COLOR", $sprite="&envelope-closed", $techn="HTTPS", $legendText="firewall")
-AddRelTag("plantuml", $textColor="$ARROW_FONT_COLOR", $lineColor="$ARROW_COLOR", $sprite="img:http://plantuml.com/logo3.png{scale=0.1}", $legendText="console triggered")
+AddRelTag("plantuml", $textColor="$ARROW_FONT_COLOR", $lineColor="$ARROW_COLOR", $sprite="img:https://plantuml.com/logo3.png{scale=0.1}", $legendText="console triggered")
 
 Person_Ext(anonymous_user, "Bob", $tags="anonymous_ext")
 Person(aggregated_user, "Sam, Ivone", $tags="customer")
diff --git a/percy/TestTagSupportsSprite.puml b/percy/TestTagSupportsSprite.puml
index 867654bc..fc8678d2 100644
--- a/percy/TestTagSupportsSprite.puml
+++ b/percy/TestTagSupportsSprite.puml
@@ -31,12 +31,12 @@ AddContainerTag("mongo_db", $sprite="mongodb", $legendText="MongoDB container")
 AddContainerTag("mysql_db", $sprite="mysql", $legendText="MySQL container")
 AddContainerTag("files", $sprite="file_server", $legendText="file server container")
 
-AddContainerTag("conApp", $sprite="img:http://plantuml.com/logo3.png{scale=0.3}", $legendSprite="img:http://plantuml.com/logo3.png{scale=0.1}", $legendText="console application")
+AddContainerTag("conApp", $sprite="img:https://plantuml.com/logo3.png{scale=0.3}", $legendSprite="img:https://plantuml.com/logo3.png{scale=0.1}", $legendText="console application")
 
 UpdateElementStyle("external_system", $bgColor=$EXTERNAL_SYSTEM_BG_COLOR, $fontColor=$EXTERNAL_SYSTEM_FONT_COLOR, $borderColor=$EXTERNAL_SYSTEM_BORDER_COLOR, $sprite = "osa_server", , $legendText="external system")
 
 AddRelTag("firewall", $textColor="$ARROW_FONT_COLOR", $lineColor="$ARROW_COLOR", $sprite="firewall,scale=0.3,color=red", $legendText="firewall")
-AddRelTag("plantuml", $textColor="$ARROW_FONT_COLOR", $lineColor="$ARROW_COLOR", $sprite="img:http://plantuml.com/logo3.png{scale=0.1}", $legendText="console triggered")
+AddRelTag("plantuml", $textColor="$ARROW_FONT_COLOR", $lineColor="$ARROW_COLOR", $sprite="img:https://plantuml.com/logo3.png{scale=0.1}", $legendText="console triggered")
 
 LAYOUT_LEFT_RIGHT()
 ' LAYOUT_LANDSCAPE()
diff --git a/percy/TestTagSupportsSpriteTechn.puml b/percy/TestTagSupportsSpriteTechn.puml
index 8bc2ff19..4a543545 100644
--- a/percy/TestTagSupportsSpriteTechn.puml
+++ b/percy/TestTagSupportsSpriteTechn.puml
@@ -31,12 +31,12 @@ AddContainerTag("mongo_db", $techn = "MongoDB 2.2.x", $sprite="mongodb", $legend
 AddContainerTag("mysql_db", $techn="MySQL 5.5.x", $sprite="mysql", $legendText="MySQL container")
 AddContainerTag("files", $sprite="file_server", $legendText="file server container")
 
-AddContainerTag("conApp", $sprite="img:http://plantuml.com/logo3.png{scale=0.3}", $legendSprite="img:http://plantuml.com/logo3.png{scale=0.1}", $legendText="console application")
+AddContainerTag("conApp", $sprite="img:https://plantuml.com/logo3.png{scale=0.3}", $legendSprite="img:https://plantuml.com/logo3.png{scale=0.1}", $legendText="console application")
 
 UpdateElementStyle("external_system", $bgColor=$EXTERNAL_SYSTEM_BG_COLOR, $fontColor=$EXTERNAL_SYSTEM_FONT_COLOR, $borderColor=$EXTERNAL_SYSTEM_BORDER_COLOR, $sprite = "osa_server", , $legendText="external system")
 
 AddRelTag("firewall", $textColor="$ARROW_FONT_COLOR", $lineColor="$ARROW_COLOR", $techn="HTTPS", $sprite="firewall,scale=0.3,color=red", $legendText="firewall")
-AddRelTag("plantuml", $textColor="$ARROW_FONT_COLOR", $lineColor="$ARROW_COLOR", $techn="HTTPS", $sprite="img:http://plantuml.com/logo3.png{scale=0.1}", $legendText="console triggered")
+AddRelTag("plantuml", $textColor="$ARROW_FONT_COLOR", $lineColor="$ARROW_COLOR", $techn="HTTPS", $sprite="img:https://plantuml.com/logo3.png{scale=0.1}", $legendText="console triggered")
 
 LAYOUT_LEFT_RIGHT()
 ' LAYOUT_LANDSCAPE()