diff --git a/api/go.mod b/api/go.mod
index 21e4b487..9fb2259b 100644
--- a/api/go.mod
+++ b/api/go.mod
@@ -1,6 +1,6 @@
 module github.com/fluxcd/source-controller/api
 
-go 1.18
+go 1.20
 
 require (
 	github.com/fluxcd/pkg/apis/acl v0.1.0
diff --git a/go.mod b/go.mod
index 14970b88..b29cc3a5 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/fluxcd/source-controller
 
-go 1.18
+go 1.20
 
 replace github.com/fluxcd/source-controller/api => ./api
 
diff --git a/tests/fuzz/Dockerfile.builder b/tests/fuzz/Dockerfile.builder
index 293a261d..5eafa0e5 100644
--- a/tests/fuzz/Dockerfile.builder
+++ b/tests/fuzz/Dockerfile.builder
@@ -1,5 +1,11 @@
 FROM gcr.io/oss-fuzz-base/base-builder-go
 
+RUN wget https://go.dev/dl/go1.20.5.linux-amd64.tar.gz \
+    && mkdir temp-go \
+    && rm -rf /root/.go/* \
+    && tar -C temp-go/ -xzf go1.20.5.linux-amd64.tar.gz \
+    && mv temp-go/go/* /root/.go/
+
 ENV SRC=$GOPATH/src/github.com/fluxcd/source-controller
 ENV FLUX_CI=true