diff --git a/Dockerfile b/Dockerfile
index 43e05864a..62ba07c93 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -73,9 +73,6 @@ COPY tap/extensions/http/go.mod ../tap/extensions/http/
 COPY tap/extensions/kafka/go.mod ../tap/extensions/kafka/
 COPY tap/extensions/redis/go.mod ../tap/extensions/redis/
 RUN go mod download
-# cheap trick to make the build faster (as long as go.mod did not change)
-RUN go get github.com/patrickmn/go-cache
-RUN go list -f '{{.Path}}@{{.Version}}' -m all | sed 1d | grep -e 'go-cache' | xargs go get
 
 # Copy and build agent code
 COPY shared ../shared
diff --git a/agent/pkg/resolver/go.sum b/agent/pkg/resolver/go.sum
index b60e6fec6..4fb6e9bb6 100644
--- a/agent/pkg/resolver/go.sum
+++ b/agent/pkg/resolver/go.sum
@@ -219,8 +219,6 @@ github.com/onsi/ginkgo v1.11.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+
 github.com/onsi/gomega v0.0.0-20170829124025-dcabb60a477c/go.mod h1:C1qb7wdrVGGVU+Z6iS04AVkA3Q65CEZX59MT0QO5uiA=
 github.com/onsi/gomega v1.7.0 h1:XPnZz8VVBHjVsy1vzJmRwIcSwiUO+JFfrv/xGiigmME=
 github.com/onsi/gomega v1.7.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
-github.com/patrickmn/go-cache v2.1.0+incompatible h1:HRMgzkcYKYpi3C8ajMPV8OFXaaRUnok+kx1WdO15EQc=
-github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
 github.com/peterbourgon/diskv v2.0.1+incompatible h1:UBdAOUP5p4RWqPBg048CAvpKN+vxiaj6gdUUzhl4XmI=
 github.com/peterbourgon/diskv v2.0.1+incompatible/go.mod h1:uqqh8zWWbv1HBMNONnaR/tNboyR3/BZd58JJSHlUSCU=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=