diff --git a/configs/callbacks/default.yaml b/configs/callbacks/default.yaml
index 5df27bfda..c9bf2fb8e 100644
--- a/configs/callbacks/default.yaml
+++ b/configs/callbacks/default.yaml
@@ -1,8 +1,8 @@
 defaults:
-  - model_checkpoint.yaml
-  - early_stopping.yaml
-  - model_summary.yaml
-  - rich_progress_bar.yaml
+  - model_checkpoint
+  - early_stopping
+  - model_summary
+  - rich_progress_bar
   - _self_
 
 model_checkpoint:
diff --git a/configs/debug/fdr.yaml b/configs/debug/fdr.yaml
index 98eba22ca..7f2d34fa3 100644
--- a/configs/debug/fdr.yaml
+++ b/configs/debug/fdr.yaml
@@ -3,7 +3,7 @@
 # runs 1 train, 1 validation and 1 test step
 
 defaults:
-  - default.yaml
+  - default
 
 trainer:
   fast_dev_run: true
diff --git a/configs/debug/limit.yaml b/configs/debug/limit.yaml
index cc288521a..514d77fbd 100644
--- a/configs/debug/limit.yaml
+++ b/configs/debug/limit.yaml
@@ -3,7 +3,7 @@
 # uses only 1% of the training data and 5% of validation/test data
 
 defaults:
-  - default.yaml
+  - default
 
 trainer:
   max_epochs: 3
diff --git a/configs/debug/overfit.yaml b/configs/debug/overfit.yaml
index d1f63e823..9906586a6 100644
--- a/configs/debug/overfit.yaml
+++ b/configs/debug/overfit.yaml
@@ -3,7 +3,7 @@
 # overfits to 3 batches
 
 defaults:
-  - default.yaml
+  - default
 
 trainer:
   max_epochs: 20
diff --git a/configs/debug/profiler.yaml b/configs/debug/profiler.yaml
index e18df1c6a..2bd7da87a 100644
--- a/configs/debug/profiler.yaml
+++ b/configs/debug/profiler.yaml
@@ -3,7 +3,7 @@
 # runs with execution time profiling
 
 defaults:
-  - default.yaml
+  - default
 
 trainer:
   max_epochs: 1
diff --git a/configs/eval.yaml b/configs/eval.yaml
index a99bebb7f..be312992b 100644
--- a/configs/eval.yaml
+++ b/configs/eval.yaml
@@ -2,13 +2,13 @@
 
 defaults:
   - _self_
-  - data: mnist.yaml # choose datamodule with `test_dataloader()` for evaluation
-  - model: mnist.yaml
+  - data: mnist # choose datamodule with `test_dataloader()` for evaluation
+  - model: mnist
   - logger: null
-  - trainer: default.yaml
-  - paths: default.yaml
-  - extras: default.yaml
-  - hydra: default.yaml
+  - trainer: default
+  - paths: default
+  - extras: default
+  - hydra: default
 
 task_name: "eval"
 
diff --git a/configs/experiment/example.yaml b/configs/experiment/example.yaml
index b68c913b9..690a59fef 100644
--- a/configs/experiment/example.yaml
+++ b/configs/experiment/example.yaml
@@ -4,10 +4,10 @@
 # python train.py experiment=example
 
 defaults:
-  - override /data: mnist.yaml
-  - override /model: mnist.yaml
-  - override /callbacks: default.yaml
-  - override /trainer: default.yaml
+  - override /data: mnist
+  - override /model: mnist
+  - override /callbacks: default
+  - override /trainer: default
 
 # all parameters below will be merged with parameters from default configurations set above
 # this allows you to overwrite only specified parameters
diff --git a/configs/logger/many_loggers.yaml b/configs/logger/many_loggers.yaml
index 801444da6..dd586800b 100644
--- a/configs/logger/many_loggers.yaml
+++ b/configs/logger/many_loggers.yaml
@@ -1,9 +1,9 @@
 # train with many loggers at once
 
 defaults:
-  # - comet.yaml
-  - csv.yaml
-  # - mlflow.yaml
-  # - neptune.yaml
-  - tensorboard.yaml
-  - wandb.yaml
+  # - comet
+  - csv
+  # - mlflow
+  # - neptune
+  - tensorboard
+  - wandb
diff --git a/configs/train.yaml b/configs/train.yaml
index 59b264a0a..c24b20681 100644
--- a/configs/train.yaml
+++ b/configs/train.yaml
@@ -4,14 +4,14 @@
 # order of defaults determines the order in which configs override each other
 defaults:
   - _self_
-  - data: mnist.yaml
-  - model: mnist.yaml
-  - callbacks: default.yaml
+  - data: mnist
+  - model: mnist
+  - callbacks: default
   - logger: null # set logger here or use command line (e.g. `python train.py logger=tensorboard`)
-  - trainer: default.yaml
-  - paths: default.yaml
-  - extras: default.yaml
-  - hydra: default.yaml
+  - trainer: default
+  - paths: default
+  - extras: default
+  - hydra: default
 
   # experiment configs allow for version control of specific hyperparameters
   # e.g. best hyperparameters for given model and datamodule
@@ -22,7 +22,7 @@ defaults:
 
   # optional local config for machine/user specific settings
   # it's optional since it doesn't need to exist and is excluded from version control
-  - optional local: default.yaml
+  - optional local: default
 
   # debugging config (enable through command line, e.g. `python train.py debug=default)
   - debug: null
diff --git a/configs/trainer/cpu.yaml b/configs/trainer/cpu.yaml
index 640f71d5a..b7d6767e6 100644
--- a/configs/trainer/cpu.yaml
+++ b/configs/trainer/cpu.yaml
@@ -1,5 +1,5 @@
 defaults:
-  - default.yaml
+  - default
 
 accelerator: cpu
 devices: 1
diff --git a/configs/trainer/ddp.yaml b/configs/trainer/ddp.yaml
index 96bef3958..ab8f89004 100644
--- a/configs/trainer/ddp.yaml
+++ b/configs/trainer/ddp.yaml
@@ -1,5 +1,5 @@
 defaults:
-  - default.yaml
+  - default
 
 strategy: ddp
 
diff --git a/configs/trainer/ddp_sim.yaml b/configs/trainer/ddp_sim.yaml
index 42626bea1..8404419e5 100644
--- a/configs/trainer/ddp_sim.yaml
+++ b/configs/trainer/ddp_sim.yaml
@@ -1,5 +1,5 @@
 defaults:
-  - default.yaml
+  - default
 
 # simulate DDP on CPU, useful for debugging
 accelerator: cpu
diff --git a/configs/trainer/gpu.yaml b/configs/trainer/gpu.yaml
index d5e5773b1..b2389510a 100644
--- a/configs/trainer/gpu.yaml
+++ b/configs/trainer/gpu.yaml
@@ -1,5 +1,5 @@
 defaults:
-  - default.yaml
+  - default
 
 accelerator: gpu
 devices: 1
diff --git a/configs/trainer/mps.yaml b/configs/trainer/mps.yaml
index 73d2cdd1b..1ecf6d5cc 100644
--- a/configs/trainer/mps.yaml
+++ b/configs/trainer/mps.yaml
@@ -1,5 +1,5 @@
 defaults:
-  - default.yaml
+  - default
 
 accelerator: mps
 devices: 1