diff --git a/.ci/files/all-regression-rules.xml b/.ci/files/all-regression-rules.xml
index 12fceb6fec..95a1423ca0 100644
--- a/.ci/files/all-regression-rules.xml
+++ b/.ci/files/all-regression-rules.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="All Regression Rules" 
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/internal/all-ecmascript.xml b/pmd-core/src/main/resources/rulesets/internal/all-ecmascript.xml
index e208b7cbb1..b65de902b2 100644
--- a/pmd-core/src/main/resources/rulesets/internal/all-ecmascript.xml
+++ b/pmd-core/src/main/resources/rulesets/internal/all-ecmascript.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="All ECMAScript Rules" 
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/internal/all-java.xml b/pmd-core/src/main/resources/rulesets/internal/all-java.xml
index 0f587e1d9e..6b82cd3fae 100644
--- a/pmd-core/src/main/resources/rulesets/internal/all-java.xml
+++ b/pmd-core/src/main/resources/rulesets/internal/all-java.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="All Java Rules" 
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/33.xml b/pmd-core/src/main/resources/rulesets/releases/33.xml
index 895e7820d9..c0072fe498 100644
--- a/pmd-core/src/main/resources/rulesets/releases/33.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/33.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="33"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/34.xml b/pmd-core/src/main/resources/rulesets/releases/34.xml
index 6d2924711e..2d95650dc1 100644
--- a/pmd-core/src/main/resources/rulesets/releases/34.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/34.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="34"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/35.xml b/pmd-core/src/main/resources/rulesets/releases/35.xml
index 70263d0435..70cf98f608 100644
--- a/pmd-core/src/main/resources/rulesets/releases/35.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/35.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="35"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/36.xml b/pmd-core/src/main/resources/rulesets/releases/36.xml
index 8a5cdf594f..ebe4a64c06 100644
--- a/pmd-core/src/main/resources/rulesets/releases/36.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/36.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="36"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/37-jsp.xml b/pmd-core/src/main/resources/rulesets/releases/37-jsp.xml
index 96bf1f2492..4f498c6089 100644
--- a/pmd-core/src/main/resources/rulesets/releases/37-jsp.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/37-jsp.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="37"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/37.xml b/pmd-core/src/main/resources/rulesets/releases/37.xml
index b037858e3a..63e173174c 100644
--- a/pmd-core/src/main/resources/rulesets/releases/37.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/37.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="37"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/38.xml b/pmd-core/src/main/resources/rulesets/releases/38.xml
index 9dacc12123..4066c581a9 100644
--- a/pmd-core/src/main/resources/rulesets/releases/38.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/38.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="38"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/39.xml b/pmd-core/src/main/resources/rulesets/releases/39.xml
index d78885d69c..4d74a755f5 100644
--- a/pmd-core/src/main/resources/rulesets/releases/39.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/39.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="39"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/40rc1.xml b/pmd-core/src/main/resources/rulesets/releases/40rc1.xml
index 0ef4736820..d4ddc30360 100644
--- a/pmd-core/src/main/resources/rulesets/releases/40rc1.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/40rc1.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="40rc1"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/41.xml b/pmd-core/src/main/resources/rulesets/releases/41.xml
index cbd7252332..5feb1e619f 100644
--- a/pmd-core/src/main/resources/rulesets/releases/41.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/41.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="41"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/42.xml b/pmd-core/src/main/resources/rulesets/releases/42.xml
index aa5f42de36..5b27009b15 100644
--- a/pmd-core/src/main/resources/rulesets/releases/42.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/42.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="42"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/50.xml b/pmd-core/src/main/resources/rulesets/releases/50.xml
index 7406926431..8603de906d 100644
--- a/pmd-core/src/main/resources/rulesets/releases/50.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/50.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="50"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/501.xml b/pmd-core/src/main/resources/rulesets/releases/501.xml
index 46101afc69..1adbe69dda 100644
--- a/pmd-core/src/main/resources/rulesets/releases/501.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/501.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="501"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/510.xml b/pmd-core/src/main/resources/rulesets/releases/510.xml
index 09a1172297..f47c469fef 100644
--- a/pmd-core/src/main/resources/rulesets/releases/510.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/510.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="510"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/512.xml b/pmd-core/src/main/resources/rulesets/releases/512.xml
index 234204bbf4..f4a9469f39 100644
--- a/pmd-core/src/main/resources/rulesets/releases/512.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/512.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="512"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/520.xml b/pmd-core/src/main/resources/rulesets/releases/520.xml
index 0d85130cd4..5e266d5fa4 100644
--- a/pmd-core/src/main/resources/rulesets/releases/520.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/520.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="520"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/540.xml b/pmd-core/src/main/resources/rulesets/releases/540.xml
index e7c4771122..abd1725995 100644
--- a/pmd-core/src/main/resources/rulesets/releases/540.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/540.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="540"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/550.xml b/pmd-core/src/main/resources/rulesets/releases/550.xml
index 82a29edb22..e8c950bba4 100644
--- a/pmd-core/src/main/resources/rulesets/releases/550.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/550.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="550"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/551.xml b/pmd-core/src/main/resources/rulesets/releases/551.xml
index 27a8321d9f..ed540e817c 100644
--- a/pmd-core/src/main/resources/rulesets/releases/551.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/551.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="551"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/552.xml b/pmd-core/src/main/resources/rulesets/releases/552.xml
index f236338c8b..8e6de0a01b 100644
--- a/pmd-core/src/main/resources/rulesets/releases/552.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/552.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="552"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/553.xml b/pmd-core/src/main/resources/rulesets/releases/553.xml
index 0a52e3b6e3..0c855e9f78 100644
--- a/pmd-core/src/main/resources/rulesets/releases/553.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/553.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="553"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/554.xml b/pmd-core/src/main/resources/rulesets/releases/554.xml
index e7ec18ff6c..34ff3006ea 100644
--- a/pmd-core/src/main/resources/rulesets/releases/554.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/554.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="554"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/560.xml b/pmd-core/src/main/resources/rulesets/releases/560.xml
index 28f5d31f47..6902a0c8e7 100644
--- a/pmd-core/src/main/resources/rulesets/releases/560.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/560.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="560"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/580.xml b/pmd-core/src/main/resources/rulesets/releases/580.xml
index 826ebc5678..fdf46f99f7 100644
--- a/pmd-core/src/main/resources/rulesets/releases/580.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/580.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="580"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/600.xml b/pmd-core/src/main/resources/rulesets/releases/600.xml
index 629a435f5a..72060bf375 100644
--- a/pmd-core/src/main/resources/rulesets/releases/600.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/600.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="600"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6100.xml b/pmd-core/src/main/resources/rulesets/releases/6100.xml
index 61132559f2..55a7c0ce95 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6100.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6100.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6100"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6110.xml b/pmd-core/src/main/resources/rulesets/releases/6110.xml
index f0479f4339..073ba6b196 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6110.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6110.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6110"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6120.xml b/pmd-core/src/main/resources/rulesets/releases/6120.xml
index 873a0d1088..4f02e5d117 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6120.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6120.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6120"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6130.xml b/pmd-core/src/main/resources/rulesets/releases/6130.xml
index bc9f417c72..745c2b607f 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6130.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6130.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6130"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6150.xml b/pmd-core/src/main/resources/rulesets/releases/6150.xml
index 13d3e58a90..9a37bd8095 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6150.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6150.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6150"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6160.xml b/pmd-core/src/main/resources/rulesets/releases/6160.xml
index 8bd7619fd2..107361ea80 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6160.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6160.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6160"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6180.xml b/pmd-core/src/main/resources/rulesets/releases/6180.xml
index 63c3841174..c630440ad2 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6180.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6180.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6180"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/620.xml b/pmd-core/src/main/resources/rulesets/releases/620.xml
index 7da81bcbcd..3f87187c20 100644
--- a/pmd-core/src/main/resources/rulesets/releases/620.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/620.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="620"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6220.xml b/pmd-core/src/main/resources/rulesets/releases/6220.xml
index 13b0cbc5b7..a9edd2814b 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6220.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6220.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6220"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6230.xml b/pmd-core/src/main/resources/rulesets/releases/6230.xml
index e2d8620ff2..4d9c0a62b3 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6230.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6230.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6230"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6240.xml b/pmd-core/src/main/resources/rulesets/releases/6240.xml
index a7fe86d521..770725c9ca 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6240.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6240.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6240"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6250.xml b/pmd-core/src/main/resources/rulesets/releases/6250.xml
index b4229076b4..e8e3163cfc 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6250.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6250.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6250"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6260.xml b/pmd-core/src/main/resources/rulesets/releases/6260.xml
index d4200e1e0c..6706823155 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6260.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6260.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6260"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6270.xml b/pmd-core/src/main/resources/rulesets/releases/6270.xml
index 0cedcd2cfb..c44aa72ec6 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6270.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6270.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6270"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6290.xml b/pmd-core/src/main/resources/rulesets/releases/6290.xml
index 59e64c0e46..08411db2f7 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6290.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6290.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6290"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/630.xml b/pmd-core/src/main/resources/rulesets/releases/630.xml
index c273134874..6b5be7128a 100644
--- a/pmd-core/src/main/resources/rulesets/releases/630.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/630.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="630"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6310.xml b/pmd-core/src/main/resources/rulesets/releases/6310.xml
index ba22a4a9c6..a56003adc6 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6310.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6310.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6310"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6340.xml b/pmd-core/src/main/resources/rulesets/releases/6340.xml
index 2291b75fd1..e80c278ccf 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6340.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6340.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6340"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6350.xml b/pmd-core/src/main/resources/rulesets/releases/6350.xml
index 09edf6a4de..98efdf211d 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6350.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6350.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6350"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6360.xml b/pmd-core/src/main/resources/rulesets/releases/6360.xml
index fbe006d984..d2a6c256b4 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6360.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6360.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6360"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6370.xml b/pmd-core/src/main/resources/rulesets/releases/6370.xml
index 2f712034f1..145f650f9c 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6370.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6370.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6370"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/640.xml b/pmd-core/src/main/resources/rulesets/releases/640.xml
index 716bc3bd9f..d0c437c2fe 100644
--- a/pmd-core/src/main/resources/rulesets/releases/640.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/640.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="640"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6400.xml b/pmd-core/src/main/resources/rulesets/releases/6400.xml
index a2b5bf9e31..894999fcf2 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6400.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6400.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6400"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6420.xml b/pmd-core/src/main/resources/rulesets/releases/6420.xml
index 0770021fcc..bb067b2247 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6420.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6420.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6420"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6450.xml b/pmd-core/src/main/resources/rulesets/releases/6450.xml
index 25ab462ed4..1020d940b4 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6450.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6450.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6450"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6460.xml b/pmd-core/src/main/resources/rulesets/releases/6460.xml
index 9601247606..85a3296dba 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6460.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6460.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6460"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/650.xml b/pmd-core/src/main/resources/rulesets/releases/650.xml
index e4c2202340..628228483e 100644
--- a/pmd-core/src/main/resources/rulesets/releases/650.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/650.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="650"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6510.xml b/pmd-core/src/main/resources/rulesets/releases/6510.xml
index f9d787e9c6..5f6f0a9520 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6510.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6510.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6510"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/6520.xml b/pmd-core/src/main/resources/rulesets/releases/6520.xml
index 644520f7f0..7b35d02837 100644
--- a/pmd-core/src/main/resources/rulesets/releases/6520.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/6520.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="6520"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/660.xml b/pmd-core/src/main/resources/rulesets/releases/660.xml
index ddfc6b2081..298be256d0 100644
--- a/pmd-core/src/main/resources/rulesets/releases/660.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/660.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="660"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/670.xml b/pmd-core/src/main/resources/rulesets/releases/670.xml
index 57924722a9..e8df82bec3 100644
--- a/pmd-core/src/main/resources/rulesets/releases/670.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/670.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="670"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/680.xml b/pmd-core/src/main/resources/rulesets/releases/680.xml
index 900dc53a4a..20c0d1f42c 100644
--- a/pmd-core/src/main/resources/rulesets/releases/680.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/680.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="680"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/690.xml b/pmd-core/src/main/resources/rulesets/releases/690.xml
index 5a50dabc80..1042a4cd3c 100644
--- a/pmd-core/src/main/resources/rulesets/releases/690.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/690.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="690"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
diff --git a/pmd-core/src/main/resources/rulesets/releases/700.xml b/pmd-core/src/main/resources/rulesets/releases/700.xml
index 4646553133..23d4a274d7 100644
--- a/pmd-core/src/main/resources/rulesets/releases/700.xml
+++ b/pmd-core/src/main/resources/rulesets/releases/700.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <ruleset name="700"
     xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"