diff --git a/CHANGES b/CHANGES
index 1c7f0e1a3a..2d4698814f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,9 @@
+4.2.0-dev.106 | 2021-09-03 18:10:31 +0000
+
+  * Code modernization: use ranged-based for loop where possible (Vlad Grigorescu)
+
+  * Improve performance of asn1_oid_to_val string conversions. (Vlad Grigorescu)
+
 4.2.0-dev.103 | 2021-09-03 18:08:57 +0000
 
   * Disable the scripts.base.frameworks.logging.sqlite.simultaneous-writes test under TSan (Tim Wojtulewicz, Corelight)
diff --git a/VERSION b/VERSION
index dc4b6a035e..c73b9c923f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.2.0-dev.103
+4.2.0-dev.106
diff --git a/src/analyzer/protocol/asn1/asn1.pac b/src/analyzer/protocol/asn1/asn1.pac
index 35a27e88ba..c949c97972 100644
--- a/src/analyzer/protocol/asn1/asn1.pac
+++ b/src/analyzer/protocol/asn1/asn1.pac
@@ -161,9 +161,8 @@ zeek::StringValPtr asn1_oid_to_val(const ASN1Encoding* oid)
 		// Underflow.
 		return zeek::val_mgr->EmptyString();
 
-	for ( size_t i = 0; i < subidentifiers.size(); ++i )
+	for ( auto subidentifier : subidentifiers )
 		{
-		subidentifier = subidentifiers[i];
 		uint64 value = 0;
 
 		for ( size_t j = 0; j < subidentifier.size(); ++j )
@@ -183,17 +182,13 @@ zeek::StringValPtr asn1_oid_to_val(const ASN1Encoding* oid)
 
 		if ( i > 0 )
 			{
-			rval += ".";
-			snprintf(tmp, sizeof(tmp), "%" PRIu64, subidentifier_values[i]);
+			snprintf(tmp, sizeof(tmp), ".%" PRIu64, subidentifier_values[i]);
 			rval += tmp;
 			}
 		else
 			{
 			std::div_t result = std::div(subidentifier_values[i], 40);
-			snprintf(tmp, sizeof(tmp), "%d", result.quot);
-			rval += tmp;
-			rval += ".";
-			snprintf(tmp, sizeof(tmp), "%d", result.rem);
+			snprintf(tmp, sizeof(tmp), "%d.%d", result.quot, result.rem);
 			rval += tmp;
 			}
 		}