diff --git a/.travis.yml b/.travis.yml
index d8392a8f..eb61e02c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,7 @@ matrix:
   -  os: osx
 
 go:
-  - 1.13.x
+  - 1.15.x
 
 notifications:
   email: false
diff --git a/Dockerfile b/Dockerfile
index 8248a222..98ad1a44 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,6 +13,7 @@ RUN dnf -y update && dnf install -y make git golang golang-github-cpuguy83-md2ma
 	which tar wget hostname util-linux bsdtar socat ethtool device-mapper iptables tree findutils nmap-ncat e2fsprogs xfsprogs lsof docker iproute \
         bats jq podman runc \
 	golint \
+	openssl \
 	&& dnf clean all
 
 # Install two versions of the registry. The first is an older version that
diff --git a/integration/copy_test.go b/integration/copy_test.go
index 3f8ba901..3d34fcd2 100644
--- a/integration/copy_test.go
+++ b/integration/copy_test.go
@@ -1114,10 +1114,12 @@ func (s *CopySuite) TestCopyVerifyingMirroredSignatures(c *check.C) {
 	// Create a signature for mirroring-primary:primary-signed without pushing there. This should be easier than using standalone-sign.
 	signingDir := filepath.Join(topDir, "signing-temp")
 	assertSkopeoSucceeds(c, "", "copy", "--src-tls-verify=false", regPrefix+"primary:unsigned", "dir:"+signingDir)
-	c.Logf("%s", combinedOutputOfCommand(c, "ls", "-laR", signingDir))
+	// Unknown error in Travis: https://github.com/containers/skopeo/issues/1093
+	//	c.Logf("%s", combinedOutputOfCommand(c, "ls", "-laR", signingDir))
 	assertSkopeoSucceeds(c, "^$", "standalone-sign", "-o", filepath.Join(signingDir, "signature-1"),
 		filepath.Join(signingDir, "manifest.json"), "localhost:5006/myns/mirroring-primary:primary-signed", "personal@example.com")
-	c.Logf("%s", combinedOutputOfCommand(c, "ls", "-laR", signingDir))
+	// Unknown error in Travis: https://github.com/containers/skopeo/issues/1093
+	//	c.Logf("%s", combinedOutputOfCommand(c, "ls", "-laR", signingDir))
 	assertSkopeoSucceeds(c, "", "--registries.d", registriesDir, "copy", "--dest-tls-verify=false", "dir:"+signingDir, regPrefix+"mirror:primary-signed")
 	// Verify that a correctly signed image for the primary is accessible using the primary's reference
 	assertSkopeoSucceeds(c, "", "--policy", policy, "--registries.d", registriesDir, "--registries-conf", "fixtures/registries.conf", "copy", "--src-tls-verify=false", regPrefix+"primary:primary-signed", dirDest)