diff --git a/.travis.yml b/.travis.yml
index 01fa5661..43cd4603 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,21 +24,21 @@ install: 'make deps'
 matrix:
   fast_finish: false
   allow_failures:
-  - go: 1.12.x
+  - go: 1.13.x
   - go: tip
   - os: osx
   # include only one build for osx for a quicker build as the nr. of these runners are sparse
   include:
   - name: "basic tests"
-    go: 1.11.x
+    go: 1.12.x
     env: TEST_BLOCK=basic
   - name: "shell tests"
-    go: 1.11.x
+    go: 1.12.x
     env: TEST_BLOCK=shell
   - name: "race tests"
-    go: 1.11.x
+    go: 1.12.x
     env: TEST_BLOCK=race
-  - go: 1.12.x
+  - go: 1.13.x
   - go: tip
   - os: osx
 script: 'TEST_BLOCK="$TEST_BLOCK" make test'
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 469f57be..70a0c3da 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,10 +1,10 @@
-FROM golang:1.9
+FROM golang:1.12
 
 MAINTAINER Michał Czeraszkiewicz <contact@czerasz.com>
 
 # Set the reset cache variable
 # Read more here: http://czerasz.com/2014/11/13/docker-tip-and-tricks/#use-refreshedat-variable-for-better-cache-control
-ENV REFRESHED_AT 2017-11-16
+ENV REFRESHED_AT 2020-09-23
 
 # Update the package list to be able to use required packages
 RUN apt-get update
diff --git a/docker/Dockerfile.development b/docker/Dockerfile.development
index 28937b04..20c7daf3 100644
--- a/docker/Dockerfile.development
+++ b/docker/Dockerfile.development
@@ -1,4 +1,4 @@
-FROM golang:1.11
+FROM golang:1.12
 
 MAINTAINER Michał Czeraszkiewicz <contact@czerasz.com>
 
diff --git a/docs/development.md b/docs/development.md
index 696e7426..8e70d6ae 100644
--- a/docs/development.md
+++ b/docs/development.md
@@ -28,7 +28,7 @@ required for running the _test_ suite.
 
 ### Build
 
-* `golang` 1.11 or higher (required, available in some distros and distributed
+* `golang` 1.12 or higher (required, available in some distros and distributed
 as a binary officially by [golang.org](https://golang.org/dl/))
 
 ### Runtime
diff --git a/docs/quick-start-guide.md b/docs/quick-start-guide.md
index 721fc050..0dbddab0 100644
--- a/docs/quick-start-guide.md
+++ b/docs/quick-start-guide.md
@@ -37,7 +37,7 @@ You'll need some dependencies, including `golang`, and some associated tools.
 
 #### Installing golang
 
-* You need golang version 1.11 or greater installed.
+* You need golang version 1.12 or greater installed.
 	* To install on rpm style systems: `sudo dnf install golang`
 	* To install on apt style systems: `sudo apt install golang`
 	* To install on macOS systems install [Homebrew](https://brew.sh)
diff --git a/engine/util/mode.go b/engine/util/mode.go
index 025d559b..269af32d 100644
--- a/engine/util/mode.go
+++ b/engine/util/mode.go
@@ -43,7 +43,7 @@ const (
 // false if not.
 func modeIsValidWho(who string) bool {
 	for _, w := range []string{"u", "g", "o"} {
-		who = strings.Replace(who, w, "", -1) // TODO: use ReplaceAll in 1.12
+		who = strings.ReplaceAll(who, w, "")
 	}
 	return len(who) == 0
 }
@@ -52,7 +52,7 @@ func modeIsValidWho(who string) bool {
 // string ('r', 'w', 'x', 's', 't').
 func modeIsValidWhat(what string) bool {
 	for _, w := range []string{"r", "w", "x", "s", "t"} {
-		what = strings.Replace(what, w, "", -1) // TODO: use ReplaceAll in 1.12
+		what = strings.ReplaceAll(what, w, "")
 	}
 	return len(what) == 0
 }
diff --git a/engine/util/util.go b/engine/util/util.go
index ce3a7ba6..ed93c32c 100644
--- a/engine/util/util.go
+++ b/engine/util/util.go
@@ -70,9 +70,9 @@ func ResPathUID(res engine.Res) string {
 	// a name of: /tmp/mgmt/foo is /tmp-mgmt-foo and
 	// a name of: /tmp/mgmt-foo -> /tmp-mgmt-foo if we replace slashes.
 	// As a result, we base64 encode (but without slashes).
-	name := strings.Replace(res.Name(), "/", "-", -1) // TODO: use ReplaceAll in 1.12
-	if os.PathSeparator != '/' {                      // lol windows?
-		name = strings.Replace(name, string(os.PathSeparator), "-", -1) // TODO: use ReplaceAll in 1.12
+	name := strings.ReplaceAll(res.Name(), "/", "-")
+	if os.PathSeparator != '/' { // lol windows?
+		name = strings.ReplaceAll(name, string(os.PathSeparator), "-")
 	}
 	b := []byte(res.Name())
 	encoded := base64.URLEncoding.EncodeToString(b)