diff --git a/appview/pulls/pulls.go b/appview/pulls/pulls.go
--- a/appview/pulls/pulls.go
+++ b/appview/pulls/pulls.go
@@ -447,7 +447,7 @@ didHandleMap[identity.DID.String()] = identity.DID.String()
 		}
 	}
 
-	w.Header().Set("Content-Type", "text/plain")
+	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 	w.Write([]byte(pull.Submissions[roundIdInt].Patch))
 }
 
diff --git a/appview/repo/repo.go b/appview/repo/repo.go
--- a/appview/repo/repo.go
+++ b/appview/repo/repo.go
@@ -590,7 +590,7 @@ w.Write(body)
 		return
 	}
 
-	w.Header().Set("Content-Type", "text/plain")
+	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 	w.Write([]byte(result.Contents))
 	return
 }
diff --git a/hook/hook.go b/hook/hook.go
--- a/hook/hook.go
+++ b/hook/hook.go
@@ -63,7 +63,7 @@ if err != nil {
 		return fmt.Errorf("failed to create request: %w", err)
 	}
 
-	req.Header.Set("Content-Type", "text/plain")
+	req.Header.Set("Content-Type", "text/plain; charset=utf-8")
 	req.Header.Set("X-Git-Dir", gitDir)
 	req.Header.Set("X-Git-User-Did", userDid)
 	req.Header.Set("X-Git-User-Handle", userHandle)
diff --git a/knotserver/handler.go b/knotserver/handler.go
--- a/knotserver/handler.go
+++ b/knotserver/handler.go
@@ -187,6 +187,6 @@ version = "unknown"
 		}
 	}
 
-	w.Header().Set("Content-Type", "text/plain")
+	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 	fmt.Fprintf(w, "knotserver/%s", version)
 }