diff --git a/Dockerfile b/Dockerfile
index 99f3362f..9eb12cb1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM fpco/stack-build:lts-12.19
+FROM fpco/stack-build:lts-12.26
 
 # Install all necessary Ubuntu packages
 RUN apt-get update && apt-get install -y python3-pip libgmp-dev libmagic-dev libtinfo-dev libzmq3-dev libcairo2-dev libpango1.0-dev libblas-dev liblapack-dev gcc g++ && \
diff --git a/docker/Dockerfile b/docker/Dockerfile
index dc9d4a1c..049d64f5 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM fpco/stack-build:lts-12.19
+FROM fpco/stack-build:lts-12.26
 # docker build -t ihaskell-dev docker
 
 # Install all necessary Ubuntu packages
diff --git a/stack.yaml b/stack.yaml
index c6cf2173..1a6afc2c 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-12.19
+resolver: lts-12.26
 
 flags: {}
 packages: