diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index fbc8f4d..0f75355 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -22,7 +22,7 @@ jobs:
           # minimum go version that works. This is not necessarily supported in
           # any way, and will be bumped up without notice as needed.  But it at
           # least lets us know what go version should work.
-          - go-version: 1.12
+          - go-version: 1.13
             platform: ubuntu-latest
 
           # include windows, but only with the latest Go version, since there
diff --git a/README.md b/README.md
index 0d242b3..f26ee88 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ additional image adjustment options.
 
 I aim to keep imageproxy compatible with the two [most recent major go
 releases][]. I also keep track of the minimum go version that still works
-(currently go1.11 with modules enabled), but that might change at any time. You
+(currently go1.13 with modules enabled), but that might change at any time. You
 can see the go versions that are tested against in
 [.github/workflows/tests.yml][].
 
diff --git a/go.mod b/go.mod
index 02c8f31..8b6b5ed 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/Azure/go-autorest/autorest v0.11.19 // indirect
 	github.com/Azure/go-autorest/autorest/to v0.4.0 // indirect
 	github.com/PaulARoy/azurestoragecache v0.0.0-20170906084534-3c249a3ba788
-	github.com/aws/aws-sdk-go v1.38.64
+	github.com/aws/aws-sdk-go v1.40.42
 	github.com/die-net/lrucache v0.0.0-20190707192454-883874fe3947
 	github.com/disintegration/imaging v1.6.2
 	github.com/dnaeon/go-vcr v1.2.0 // indirect
diff --git a/go.sum b/go.sum
index 837be7a..c28bc84 100644
--- a/go.sum
+++ b/go.sum
@@ -73,8 +73,8 @@ github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRF
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
-github.com/aws/aws-sdk-go v1.38.64 h1:aE178SZNBpAT9T2U5hacKJiyiRE/Li2Hax6xddVuyGA=
-github.com/aws/aws-sdk-go v1.38.64/go.mod h1:hcU610XS61/+aQV88ixoOzUoG7v3b31pl2zKMmprdro=
+github.com/aws/aws-sdk-go v1.40.42 h1:LbnRM4D9fAmNZxMAZx21Efpp5MKHx2BAETS+pn90lxI=
+github.com/aws/aws-sdk-go v1.40.42/go.mod h1:585smgzpB/KqRA+K3y/NL/oYRqQvpNJYvLm+LY1U59Q=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
@@ -386,8 +386,9 @@ golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
-golang.org/x/net v0.0.0-20210503060351-7fd8e65b6420 h1:a8jGStKg0XqKDlKqjLrXn0ioF5MH36pT7Z0BRTqLhbk=
 golang.org/x/net v0.0.0-20210503060351-7fd8e65b6420/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.0.0-20210614182718-04defd469f4e h1:XpT3nA5TvE525Ne3hInMh6+GETgn27Zfm9dxsThnX2Q=
+golang.org/x/net v0.0.0-20210614182718-04defd469f4e/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=