diff --git a/.travis.yml b/.travis.yml
index bd60f14..605be12 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,8 @@
     - d: dmd-2.066.1
     - d: dmd-2.065.0
     - d: dmd-2.064.2
+      env:
+        - FRONTEND=2.064
     - d: ldc-0.15.1
     - d: ldc-0.14.0
     - d: gdc-4.9.2
diff --git a/dub.selections.json b/dub.selections.json
index 2020332..877c7ff 100644
--- a/dub.selections.json
+++ b/dub.selections.json
@@ -1,11 +1,11 @@
 {
 	"fileVersion": 1,
 	"versions": {
-		"memutils": "0.3.2",
+		"memutils": "0.4.1",
 		"libevent": "2.0.1+2.0.16",
-		"vibe-d": "0.7.23",
+		"vibe-d": "0.7.24",
 		"openssl": "1.1.4+1.0.1g",
-		"libev": "5.0.0+4.04",
-		"libasync": "0.7.1"
+		"libasync": "0.7.5",
+		"libev": "5.0.0+4.04"
 	}
 }
diff --git a/travis-ci.sh b/travis-ci.sh
index e1363d7..3f750fb 100755
--- a/travis-ci.sh
+++ b/travis-ci.sh
@@ -2,7 +2,10 @@
 
 set -e -o pipefail
 
-dub test --compiler=${DC} -c library-nonet
+if [ -z "$FRONTEND" -o "$FRONTEND" \> 2.064.2 ]; then
+    dub fetch vibe-d --version=0.7.24 # get optional dependency
+    dub test --compiler=${DC} -c library-nonet
+fi
 
 if [ "$COVERAGE" = true ]; then
     # library-nonet fails to build with coverage (Issue 13742)