diff --git a/org.hl7.fhir.dstu2/src/main/java/org/hl7/fhir/dstu2/utils/client/ClientUtils.java b/org.hl7.fhir.dstu2/src/main/java/org/hl7/fhir/dstu2/utils/client/ClientUtils.java
index 439d946d1..c5cc2ba3c 100644
--- a/org.hl7.fhir.dstu2/src/main/java/org/hl7/fhir/dstu2/utils/client/ClientUtils.java
+++ b/org.hl7.fhir.dstu2/src/main/java/org/hl7/fhir/dstu2/utils/client/ClientUtils.java
@@ -307,7 +307,6 @@ public class ClientUtils {
       request.addHeader("Accept", format);
       request.addHeader("Content-Type", format + ";charset=" + DEFAULT_CHARSET);
     }
-    request.addHeader("Accept-Charset", DEFAULT_CHARSET);
     if (headers != null) {
       for (Header header : headers) {
         request.addHeader(header);
diff --git a/org.hl7.fhir.dstu2016may/src/main/java/org/hl7/fhir/dstu2016may/utils/client/ClientUtils.java b/org.hl7.fhir.dstu2016may/src/main/java/org/hl7/fhir/dstu2016may/utils/client/ClientUtils.java
index 93ead03ff..8ad3be73b 100644
--- a/org.hl7.fhir.dstu2016may/src/main/java/org/hl7/fhir/dstu2016may/utils/client/ClientUtils.java
+++ b/org.hl7.fhir.dstu2016may/src/main/java/org/hl7/fhir/dstu2016may/utils/client/ClientUtils.java
@@ -263,7 +263,6 @@ public class ClientUtils {
       request.addHeader("Accept", format);
       request.addHeader("Content-Type", format + ";charset=" + DEFAULT_CHARSET);
     }
-    request.addHeader("Accept-Charset", DEFAULT_CHARSET);
     if (headers != null) {
       for (Header header : headers) {
         request.addHeader(header);
diff --git a/org.hl7.fhir.dstu3/src/main/java/org/hl7/fhir/dstu3/utils/client/network/FhirRequestBuilder.java b/org.hl7.fhir.dstu3/src/main/java/org/hl7/fhir/dstu3/utils/client/network/FhirRequestBuilder.java
index fbf47168f..006cf6bd8 100644
--- a/org.hl7.fhir.dstu3/src/main/java/org/hl7/fhir/dstu3/utils/client/network/FhirRequestBuilder.java
+++ b/org.hl7.fhir.dstu3/src/main/java/org/hl7/fhir/dstu3/utils/client/network/FhirRequestBuilder.java
@@ -84,7 +84,6 @@ public class FhirRequestBuilder {
   /**
    * Adds necessary headers for all REST requests.
    * <li>User-Agent : hapi-fhir-tooling-client</li>
-   * <li>Accept-Charset : {@link FhirRequestBuilder#DEFAULT_CHARSET}</li>
    *
    * @param request {@link Request.Builder} to add default headers to.
    */
@@ -92,7 +91,6 @@ public class FhirRequestBuilder {
     if (headers == null || !headers.names().contains("User-Agent")) {
       request.addHeader("User-Agent", "hapi-fhir-tooling-client");
     }
-    request.addHeader("Accept-Charset", DEFAULT_CHARSET);
   }
 
   /**
diff --git a/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/client/network/FhirRequestBuilder.java b/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/client/network/FhirRequestBuilder.java
index 00c2de377..59c596d08 100644
--- a/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/client/network/FhirRequestBuilder.java
+++ b/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/client/network/FhirRequestBuilder.java
@@ -88,7 +88,6 @@ public class FhirRequestBuilder {
   /**
    * Adds necessary headers for all REST requests.
    * <li>User-Agent : hapi-fhir-tooling-client</li>
-   * <li>Accept-Charset : {@link FhirRequestBuilder#DEFAULT_CHARSET}</li>
    *
    * @param request {@link Request.Builder} to add default headers to.
    */
@@ -96,7 +95,6 @@ public class FhirRequestBuilder {
     if (headers == null || !headers.names().contains("User-Agent")) {
       request.addHeader("User-Agent", "hapi-fhir-tooling-client");
     }
-    request.addHeader("Accept-Charset", DEFAULT_CHARSET);
   }
 
   /**
diff --git a/org.hl7.fhir.r4/src/test/resources/schemas/fhir-xhtml.xsd b/org.hl7.fhir.r4/src/test/resources/schemas/fhir-xhtml.xsd
index 1e442e4ef..f76ea9b51 100644
--- a/org.hl7.fhir.r4/src/test/resources/schemas/fhir-xhtml.xsd
+++ b/org.hl7.fhir.r4/src/test/resources/schemas/fhir-xhtml.xsd
@@ -1558,7 +1558,6 @@
           <xs:attribute name="onsubmit" type="Script"/>
           <xs:attribute name="onreset" type="Script"/>
           <xs:attribute name="accept" type="ContentTypes"/>
-          <xs:attribute name="accept-charset" type="Charsets"/>
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
diff --git a/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/utils/client/network/FhirRequestBuilder.java b/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/utils/client/network/FhirRequestBuilder.java
index 3fc062aab..24a99b2cf 100644
--- a/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/utils/client/network/FhirRequestBuilder.java
+++ b/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/utils/client/network/FhirRequestBuilder.java
@@ -78,7 +78,6 @@ public class FhirRequestBuilder {
   /**
    * Adds necessary headers for all REST requests.
    * <li>User-Agent : hapi-fhir-tooling-client</li>
-   * <li>Accept-Charset : {@link FhirRequestBuilder#DEFAULT_CHARSET}</li>
    *
    * @param request {@link Request.Builder} to add default headers to.
    */
@@ -86,7 +85,6 @@ public class FhirRequestBuilder {
     if (headers == null || !headers.names().contains("User-Agent")) {
       request.addHeader("User-Agent", "hapi-fhir-tooling-client");
     }
-    request.addHeader("Accept-Charset", DEFAULT_CHARSET);
   }
 
   /**
diff --git a/org.hl7.fhir.r4b/src/test/java/org/hl7/fhir/r4b/utils/client/network/FhirRequestBuilderTest.java b/org.hl7.fhir.r4b/src/test/java/org/hl7/fhir/r4b/utils/client/network/FhirRequestBuilderTest.java
index 95e7f9ff2..8cd65e5d3 100644
--- a/org.hl7.fhir.r4b/src/test/java/org/hl7/fhir/r4b/utils/client/network/FhirRequestBuilderTest.java
+++ b/org.hl7.fhir.r4b/src/test/java/org/hl7/fhir/r4b/utils/client/network/FhirRequestBuilderTest.java
@@ -26,9 +26,6 @@ class FhirRequestBuilderTest {
     Assertions.assertEquals("hapi-fhir-tooling-client", headersMap.get("User-Agent").get(0),
         "User-Agent header not populated with expected value \"hapi-fhir-tooling-client\".");
 
-    Assertions.assertNotNull(headersMap.get("Accept-Charset"), "Accept-Charset header null.");
-    Assertions.assertEquals(FhirRequestBuilder.DEFAULT_CHARSET, headersMap.get("Accept-Charset").get(0),
-        "Accept-Charset header not populated with expected value " + FhirRequestBuilder.DEFAULT_CHARSET);
   }
 
   @Test
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/client/network/FhirRequestBuilder.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/client/network/FhirRequestBuilder.java
index 1edacd331..58e5c9511 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/client/network/FhirRequestBuilder.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/client/network/FhirRequestBuilder.java
@@ -75,7 +75,6 @@ public class FhirRequestBuilder {
   /**
    * Adds necessary headers for all REST requests.
    * <li>User-Agent : hapi-fhir-tooling-client</li>
-   * <li>Accept-Charset : {@link FhirRequestBuilder#DEFAULT_CHARSET}</li>
    *
    * @param request {@link Request.Builder} to add default headers to.
    */
@@ -83,7 +82,6 @@ public class FhirRequestBuilder {
     if (headers == null || !headers.names().contains("User-Agent")) {
       request.addHeader("User-Agent", "hapi-fhir-tooling-client");
     }
-    request.addHeader("Accept-Charset", DEFAULT_CHARSET);
   }
 
   /**
diff --git a/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/utils/client/network/FhirRequestBuilderTest.java b/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/utils/client/network/FhirRequestBuilderTest.java
index b56909bdd..78ab6d45b 100644
--- a/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/utils/client/network/FhirRequestBuilderTest.java
+++ b/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/utils/client/network/FhirRequestBuilderTest.java
@@ -23,10 +23,6 @@ class FhirRequestBuilderTest {
     Assertions.assertNotNull(headersMap.get("User-Agent"), "User-Agent header null.");
     Assertions.assertEquals("hapi-fhir-tooling-client", headersMap.get("User-Agent").get(0),
       "User-Agent header not populated with expected value \"hapi-fhir-tooling-client\".");
-
-    Assertions.assertNotNull(headersMap.get("Accept-Charset"), "Accept-Charset header null.");
-    Assertions.assertEquals(FhirRequestBuilder.DEFAULT_CHARSET, headersMap.get("Accept-Charset").get(0),
-      "Accept-Charset header not populated with expected value " + FhirRequestBuilder.DEFAULT_CHARSET);
   }
 
   @Test